AITS Test 01 - 2024-2025 Exam Paper PDF

All India Test Series (2024-25) AITS TEST - 01 DURATION: DURATION 200 : 90 Minutes DATE: 15/09/2024 M. MARKS: 720 ANSWER KEY (PHYSICS)...

All India Test Series (2024-25) AITS TEST - 01 DURATION: DURATION 200 : 90 Minutes DATE: 15/09/2024 M. MARKS: 720 ANSWER KEY (PHYSICS) SECTION-A 1. (4) 8. (4) 15. (3) 22. (4) 29. (3) 2. (3) 9. (1) 16. (1) 23. (2) 30. (3) 3. (1) 10. (2) 17. (2) 24. (1) 31. (1) 4. (2) 11. (3) 18. (4) 25. (2) 32. (4) 5. (4) 12. (2) 19. (2) 26. (1) 33. (2) 6. (3) 13. (3) 20. (1) 27. (2) 34. (1) 7. (3) 14. (1) 21. (3) 28. (2) 35. (3) SECTION-B 36. (1) 39. (3) 42. (1) 45. (3) 48. (1) 37. (2) 40. (3) 43. (1) 46. (4) 49. (4) 38. (1) 41. (4) 44. (4) 47. (2) 50. (4) (CHEMISTRY) SECTION-A 51. (1) 58. (4) 65. (3) 72. (1) 79. (1) 52. (1) 59. (2) 66. (3) 73. (2) 80. (3) 53. (1) 60. (1) 67. (3) 74. (1) 81. (1) 54. (3) 61. (4) 68. (4) 75. (4) 82. (3) 55. (4) 62. (3) 69. (4) 76. (3) 83. (2) 56. (4) 63. (1) 70. (2) 77. (1) 84. (3) 57. (1) 64. (3) 71. (4) 78. (1) 85. (2) SECTION-B 86. (2) 89. (1) 92. (4) 95. (1) 98. (2) 87. (3) 90. (1) 93. (3) 96. (4) 99. (4) 88. (1) 91. (1) 94. (2) 97. (2) 100. (1) (BOTANY) SECTION-A 101. (4) 108. (1) 115. (4) 122. (3) 129. (3) 102. (3) 109. (4) 116. (1) 123. (2) 130. (1) 103. (1) 110. (4) 117. (3) 124. (3) 131. (4) 104. (3) 111. (3) 118. (4) 125. (2) 132. (4) 105. (4) 112. (4) 119. (4) 126. (3) 133. (2) 106. (3) 113. (3) 120. (4) 127. (2) 134. (1) 107. (1) 114. (2) 121. (4) 128. (2) 135. (3) SECTION-B 136. (1) 139. (2) 142. (3) 145. (1) 148. (3) 137. (4) 140. (4) 143. (1) 146. (3) 149. (1) 138. (3) 141. (3) 144. (1) 147. (1) 150. (3) (ZOOLOGY) SECTION-A 151. (4) 158. (4) 165. (3) 172. (3) 179. (2) 152. (2) 159. (2) 166. (4) 173. (2) 180. (2) 153. (3) 160. (1) 167. (3) 174. (2) 181. (2) 154. (2) 161. (2) 168. (3) 175. (3) 182. (3) 155. (2) 162. (2) 169. (2) 176. (2) 183. (3) 156. (1) 163. (2) 170. (4) 177. (4) 184. (3) 157. (4) 164. (3) 171. (4) 178. (2) 185. (3) SECTION-B 186. (2) 189. (4) 192. (2) 195. (1) 198. (1) 187. (1) 190. (1) 193. (3) 196. (3) 199. (2) 188. (4) 191. (4) 194. (4) 197. (2) 200. (3)  Hints & Solutions [AITS-01 | 12th-NEET | 15-09-2024] (PHYSICS) SECTION-A 9. (1) 11R 1. (4) Distance from center lies inside the spherical Net charge enclosed inside spherical surface 13 = +q – q = 0 shell. Electric field inside spherical shell is zero. 2. (3) 10. (2) 0i Electrostatic force is conservative force, hence , A = r 2 B= work done by electrostatic force depend on initial 2r 1 and final position only.  A 2 2 B   = 0i  11. (3) Using KCL at junction D 0 2i 2  iDE = 5 + 3 = 8 A A= 4B2 Using KCL at junction E iDE = 2 + i 3. (1) i =8−2 = 6A division on scale Current sensitivity = current 12. (2) Two parallel wires carrying currents in same 4. (2) direction attracts each other while in opposite direction repel each other. 13. (3) For static equilibrium, | F | =| Fe | 1 1 2 3 = + = | F | = q| E | Ceq C C C 50 = 200q C q = 0.25 Coulomb Ceq = 3 14. (1) 5. (4) dV ˆ d Charge on body remains same whether the body is E=− i = − (6 x 2 + 5 x + 1)iˆ dx dx at rest or in motion. Electric charge is quantized. E = −(12x + 5)iˆ When positive charge in given to a body, some electrons are removed from it, hence its mass E( x=2m) = (−29iˆ) N/C slightly decreases. 15. (3) 6. (3) If voltage V is greater than rated voltage of both Resistivity is a material property and it does not bulbs, then both bulbs will get fused. change with length of material. 16. (1) 7. (3) −7 B = 0 ni = 4 10  300  2 = 0.76 mT Line containing points A, B, C and D is perpendicular to electric field lines.  VA = VB = VC = VD 17. (2) Magnitude of electric field at equatorial position of 8. (4) kp electric dipole is 3. Magnetic field along the axis of wire length is zero. r 18. (4) 25. (2) C = 40 R p = i2 R  1  −12 p  R (i = constant)   C = kC = 9  10  10  10 9 R=  4 0 R = 90 × 10–3 m = 9 cm. 26. (1)  B. dl = 0 Ienclosed = 0 (3 − 2) = 0 19. (2) 0i  dl  r  dB =   27. (2) 4  r 3  kQ 4kq 2kq 3kQ V =− + + + =0 r r r r 20. (1) 6kq + 2kQ = 0 An ammeter should have small resistance and Q = –3q voltmeter should have large resistance. 28. (2) 21. (3) l 2 (0.8l )2 R= , R = = 0.64R V V R − R Percentage decrease = 100 Eat p = 0 R  R − 0.64R  kq1 kq2 =  100 = 36% − =0  R  x 2 (80 + x)2 q1 q2 = 29. (3) x 2 (80 + x)2 0i  i  i | Bat A | = − 0 = 0 80 + x 4R 4(2R) 8R =5 x x = 20 cm. 30. (3) Distance from negative charge = 20 + 80 = 100 cm Circuit immediately after closing the switch 22. (4) For balance condition, X 40 X 2 = , = Y 60 Y 3 23. (2) Req = 4 mv v qB 4 = i4 R= , = = qB R m i = 1A 24. (1) 31. (1) kq 3kq V= , 2V = r1 2r2 r1 4 = r2 3 32. (4) k (q)(−2q) k (q)(q) k (q)(−2q) 2m U= + + T= L L L qB −3kq2 Time period is independent of speed of the particle. U= L U = 0 33. (2) R 3kq2 Electric field is maximum at x = Wext = U − U = 2 L 34. (1) 43. (1) F = i(l  B) = i((4Riˆ)  (Bkˆ)) = 4BiR(− ˆj) | F | = 4BiR 1 1 1 4 = + , Req =  44. (4) Req 2 4 3 35. (3) U = − | P | | E | cos  U is maximum at  = 180° SECTION-B 36. (1) Net electric field is zero in region I and III. E = xiˆ + yjˆ + zkˆ 45. (3)  = p E It is a balanced wheat-stone bridge.  = (3iˆ)  (xiˆ + yjˆ + zkˆ)  −12kˆ = 3ykˆ − 3zjˆ 20  20 Req = = 10  On comparing, 20 + 20 y = – 4, E = −4 ˆj 20 = i × 10 i = 2A 37. (2) 46. (4) W = Q(V ) When a charge particle enters a transverse −50 = 6(VB − VA ) magnetic field, work done by magnetic force is −25 zero and linear momentum of particle is not VB − VA = volt 3 constant. 38. (1) 47. (2) Using KVL Q = 2CV 5 −14i − 4i + 15 − 2i = 0 , i = 1A Work done by battery = QV = 2CV 2 V(across 14) = 1 × 14 = 14 volt V(across cell A) = 5 − 2i = 3V 48. (1) V(across cell B) = 15 − 4i = 11V Current density is inversely proportional to the cross-sectional area of wire. 39. (3) Ratio of  and  does not depend on charges but 49. (4) depend on mass only. ( ) Fm = q (3iˆ)  (5 ˆj ) = 15qkˆ tan  m2 = as m1 = m2   =  Fe = qE = −15qkˆ tan  m1 40. (3) F = 15qkˆ −15qkˆ = 0 net Due to symmetry, net electric field at O is zero, Net force on particle is zero, so it moves with hence force on charge particle Q is zero. constant velocity. 41. (4) 50. (4) It always experience zero net force but value of V 2 (220)2 torque depend on orientation of dipole placed in R= = = 484  electrostatic field. P 100 484 Resistance of half piece = = 242  42. (1) 2 Potential difference V remains same as battery is Resistance of pieces when connected in parallel connected. 242 V = Ed …(1) = = 121 2 V = E(2d) …(2) Energy liberated/second E E = V 2 220  220 2 P= = = 400 W R 121  [AITS-01 | 12th-NEET | 15-09-2024] (CHEMISTRY) SECTION-A 57. (1) 51. (1) From exp. (1); k[1.0]x[1.0]y = 0.20 ……..(i) Osmotic pressure is widely used to determine From exp. (2); k[2.0]x[1.0]y = 0.40 ……..(ii) molar masses of proteins, polymers and other From exp. (3); k[2.0]x[2.0]y = 0.40 ……..(iii) macromolecules. Dividing eq.(ii) by (i) (NEW NCERT 12th Part-I Page No. 21) [2.0]x 0.40 = [1.0]x 0.20 52. (1) (2)x = 2 Cu2+ + 2e− → Cu x=1 Charge required to reduce 1 mole of Cu2+ to Cu = Dividing eq.(iii) by (ii) 2F [2.0]y 0.40 Hence, charge required to reduce 5 moles of Cu2+ = to Cu = 10 F [1.0]y 0.40 (NEW NCERT 12th Part-I Page No. 52) (2)y = 1 = (2)0 y=0 53. (1) Hence, overall order = x + y = 1 + 0 = 1 2.303 [A0 ] (NEW NCERT 12th Part-I Page No. 73) k= log t [A] 2.303 k= log 58. (4) 10 [100 − 90] The presence of an electron withdrawing group at 2.303 k= log ortho and para position increases the reactivity of 10 halogens in haloarenes toward SN reaction. More 2.303 k= the electron withdrawing group, more will be 10 k = 0.2303 min −1 reactivity towards nucleophilic substitution (NEW NCERT 12th Part-I Page No. 72) reaction. (NEW NCERT 12th Part-II Page No. 182) 54. (3) For the same alkyl group, the boiling points of alkyl 59. (2) halides decrease in the order: RI> RBr> RCl> RF. A mixture of chloroform and acetone forms a This is because with the increase in size and mass solution with negative deviation from Raoult’s law. of halogen atom, the magnitude of van der Waal This is because chloroform molecule is able to forces increases. form hydrogen bond with acetone molecule. This (NEW NCERT 12th Part-II Page No. 168) decreases the escaping tendency of molecules for each component and consequently the vapour 55. (4) pressure decreases resulting in negative deviation Mole fraction and molality are temperature from Raoult’s law. independent while %w/V and molarity are (NEW NCERT 12th Part-I Page No. 14) temperature dependent. (NEW NCERT 12th Part-I Page No. 03) 60. (1) 56. (4) At cathode: Cu 2+ + 2e− → Cu(s) According to the relation, ∆rG = –nFEcell At anode: 2Cl− → Cl2  +2e− Reaction will be spontaneous if, ∆rG < 0 and Ecell > 0 (NEW NCERT 12th Part-I Page No. 52) (NEW NCERT 12th Part-I Page No. 35) 61. (4) 69. (4) For first order reaction, t1/2 is independent to the rate = k[A]n ……..(i) 8 × rate = k[2A]n …..(ii) initial concentration of reactant. Dividing (ii) by (i) (NEW NCERT 12th Part-I Page No. 77) 8 = (2)n n=3 (NEW NCERT 12th Part-I Page No. 65) 62. (3) The density increases with increase in number of 70. (2) carbon atoms, halogen atoms and atomic mass of H+ has exceptionally high limiting molar the halogen atoms. conductivity among all and Na+ has minimum molar conductivity (50.1 S cm2 mol–1). (NEW NCERT 12th Part-II Page No. 169) (NEW NCERT 12th Part-I Page No. 49) 63. (1) 71. (4) Lower the value of KH at a given temperature, If in a nearly saturated solution, the dissolution higher is the solubility of the gas in water. process is exothermic, the solubility will (NEW NCERT 12th Part-I Page No. 07) decrease with rise in temperature. Pressure does not have any significant effect on 64. (3) solubility of solids in liquids. Higher the reduction potential, lesser the reducing (NEW NCERT 12th Part-I Page No. 06) power. (NEW NCERT 12th Part-I Page No. 37) 72. (1) 65. (3) For zero order reaction, Rate = k[A]0 ⇒ Rate = k Hence, the unit of rate and rate constant are same. (NEW NCERT 12th Part-II Page No. 170) Also, the rate of zero order reaction is independent to initial concentration of reactant. 73. (2) (NEW NCERT 12th Part-I Page No. 71) For a chemical reaction with rise in temperature by 10°C, the rate constant is nearly doubled. 66. (3) (NEW NCERT 12th Part-I Page No. 78) Allylic and benzylic halides show high reactivity towards the SN1 reaction. The carbocation formed 74. (1) gets stabilised through resonance. When alkyl halide is heated in the presence of (NEW NCERT 12th Part-II Page No. 174) metallic fluorides, alkyl fluoride is obtained. The reaction is termed as Swarts reaction. 67. (3) (NEW NCERT 12th Part-II Page No. 165) w B 1000 Tf = k f  MB  w A 75. (4) k  w B 1000 Ba(NO3 )2 Ba 2+ + 2NO3− MB = f Tf  w A Initial moles 1 0 0 After dissociation 1− α α 2α 1.86  40 1000 MB = 0.4  500 Total moles = 1 + 2 MB = 372 g i = 1 + 2 (NEW NCERT 12th Part-I Page No. 19) i − 1 1.50 − 1 0.50 α= = = = 0.25 = 25% 2 2 2 68. (4) (NEW NCERT 12th Part-I Page No. 23) Cell constant = resistance × specific conductance = 100 × 0.5 × 10–3 = 0.05 cm–1 76. (3) (NEW NCERT 12th Part-I Page No. 43) Dry cell is also known as Leclanche cell which is used commonly in our transistors and clocks. (NEW NCERT 12th Part-I Page No. 54) 77. (1) 83. (2) H = Ef – Eb ⇒ – 40 = 80 – Eb ⇒ Eb = +120 kcal Massof solute1000 Molarity = (NEW NCERT 12th Part-I Page No. 79) Molar massof solute  V(in mL) 5.6 M= 1000 = 2.5M 56  40 78. (1) (NEW NCERT 12th Part-I Page No. 04) 2,3-Dihyroxypropanal (OHCCHOH-CH2OH) is a chiral molecule. 84. (3) SN2 reactions of optically active halides are 2Cl− → Cl2 + 2e− accompanied by inversion of configuration. MIt w= (NEW NCERT 12th Part-II Page No. 179) nF 711930  t 35.5 = 79. (1) 2  96500 Higher the value of i × m, more will be the boiling 35.5  2  96500 t= = 50 sec point of aqueous solution. 711930 Na 2SO4 : i  m = 3  0.2 = 0.6 (NEW NCERT 12th Part-I Page No. 51) Urea : i  m = 1 0.1= 0.1 85. (2) Glucose : i  m = 1 0.2 = 0.2 Decomposition of N2O5: 1st order reaction KCl : i  m = 2  0.2 = 0.4 Inversion of cane sugar: pseudo 1st order reaction (NEW NCERT 12th Part-I Page No. 18) Hydrogenation of ethene: 1st order reaction Thermal decomposition of HI on gold surface: zero 80. (3) order reaction. Conductivity always decreases with decrease in (NEW NCERT 12th Part-I Page No. 78) concentration of both weak and strong electrolytes. SECTION-B This can be explained by the fact that the number 86. (2) of ions per unit volume that carry the current in a 2CHCl3 + O2 ⎯⎯⎯ light → 2COCl2 + 2HCl (Phosgene) solution decreases on dilution. (NEW NCERT 12th Part-I Page No. 46) (NEW NCERT 12th Part-II Page No. 178) 87. (3) 81. (1) 1 2 − Ea χA = and χ B = k = Ae RT 3 3 Ea PT = PA0 χ A + PB0 χ B log k = log A – 2.303RT 1 2 = 200  + 50  Comparing with y = mx + c 3 3 −Ea 200 100 m= = + 2.303R 3 3 (NEW NCERT 12th Part-I Page No. 80) = 100 mm Hg (NEW NCERT 12th Part-I Page No. 14) 82. (3) Friedel-craft reaction: 88. (1) 0.059 E0(cell) = log KC = 1.10 2 1.10  2 log KC = = 37.28 0.059 (NEW NCERT 12th Part-I Page No. 39) (NEW NCERT 12th Part-II Page No. 184) 89. (1) 94. (2) The general formula for unit of rate constant is: CH3CH2Br + K+ONO− → CH3CH2ONO + KBr Unit of k = mol1–n Ln–1 time–1 (NEW NCERT 12th Part-II Page No. 170) –1 For First order reaction: Unit of k = s For Second order reaction: Unit of k = mol–1 L s–1 95. (1) –2 2 –1 For Third order reaction: Unit of k = mol L s At high altitudes the partial pressure of oxygen For Zero order reaction: Unit of k = mol L–1 s–1 is less than that at the ground level. This leads (NEW NCERT 12th Part-I Page No. 69) to low concentrations of oxygen in the blood and tissues of people living at high altitudes or 90. (1) climbers. Low blood oxygen causes climbers List-I List-II to become weak and unable to think clearly, (Reaction) (Name of symptoms of a condition known as anoxia. reaction) To increase the solubility of CO2 in soft drinks A. II. Wurtz-fittig and soda water, the bottle is sealed under high reaction pressure. B. I. Fittig (NEW NCERT 12th Part-I Page No. 08) reaction C. IV. Sandmeyer’s 96. (4) reaction Relative lowering of vapour pressure = Xsolute = 0.1 1 D. III. Finkelstein = 0.1 + 10 101 reaction (NEW NCERT 12th Part-I Page No. 21) (NEW NCERT 12th Part-II Page No. 181) 97. (2) 91. (1) In Daniell cell, when Eext (opposite potential) > π =CRT 1.10 V =0.2×0.082×300 Electrons flow from Cu to Zn and current flows =4.92 atm from Zn to Cu. (NEW NCERT 12th Part-I Page No. 22) Zinc is deposited at the zinc electrode and copper dissolves at copper electrode. 92. (4) (NEW NCERT 12th Part-I Page No. 32) 0m (MgCl2 ) = 0Mg2+ + 20Cl− 98. (2) = 106 + 2(76.3) The solutions that show large negative deviation = 258.6 S cm2 mol–1 from Raoult’s law form maximum boiling (NEW NCERT 12th Part-I Page No. 45) azeotrope at a specific composition. (NEW NCERT 12th Part-I Page No. 15) 93. (3) A catalyst does not alter Gibbs energy of a 99. (4) reaction. 1 [Br − ] 1 [H+ ] 1 [Br2 ] 1 [H2O] rate = − =− =+ =+ A catalyst does not change the equilibrium 5 t 6 t 3 t 3 t constant of a reaction. (NEW NCERT 12th Part-I Page No. 69) (NEW NCERT 12th Part-I Page No. 82) 100. (1) In gem-dihalide, two halogen atoms are present on same carbon atom. (NEW NCERT 12th Part-II Page No. 161)  [AITS-01 | 12th -NEET | 15-09-2024] (BOTANY) SECTION-A 110. (4) 101. (4) Griffith’s observations: In a transverse section, a typical microsporangium S strain → Inject into mice → Mice die appears near circular in outline. It is generally R strain → Inject into mice → Mice live surrounded by four wall layers– the epidermis S strain (heat-killed) → Inject into mice → Mice live endothecium, middle layers and the tapetum. S strain (heat-killed) + R strain (live) → Inject (NEW NCERT 12th Page No. 05) into mice → Mice die (NEW NCERT 12th Page No. 84) 102. (3) Chromosome 1 has most genes (2968), and the Y 111. (3) has the fewest (231). During pollen-pistil interaction the pollen tube, (NEW NCERT 12th Page No. 104) after reaching the ovary, enters the ovule through the micropyle and then enters one of the synergids through the filiform apparatus. 103. (1) (NEW NCERT 12th Page No. 17) Occurrence of more than one embryo in a seed is referred to as polyembryony. 112. (4) (NEW NCERT 12th Page No. 23) GUG codes for amino acid Valine. (NEW NCERT 12th Page No. 96) 104. (3) Erwin Chargaff observed that for a double stranded 113. (3) DNA, the ratios between Adenine and Thymine and A typical dicotyledonous embryo, consists of an Guanine and Cytosine are constant and equals one. embryonal axis and two cotyledons. Embryos of (NEW NCERT 12th Page No. 81) monocotyledons possess only one cotyledon. (NEW NCERT 12th Page No. 19) 105. (4) The number of ovules in an ovary may be one 114. (2) (wheat, paddy, mango) to many (papaya, water A nucleotide has three components – a nitrogenous melon, orchids). base, a pentose sugar (ribose in case of RNA, and (NEW NCERT 12th Page No. 09) deoxyribose for DNA), and a phosphate group. There are two types of nitrogenous bases – Purines 106. (3) (Adenine and Guanine), and Pyrimidines (Cytosine, In bacteria, the transcribed mRNA is functional, Uracil and Thymine). Cytosine is common for both hence can directly be translated. DNA and RNA and Thymine is present in DNA. (NEW NCERT 12th Page No. 108) Uracil is present in RNA at the place of Thymine. (NEW NCERT 12th Page No. 80) 107. (1) In dicots, the zygote gives rise to the proembryo 115. (4) and subsequently to the globular, heart-shaped In some species floral rewards are in providing and mature embryo. safe places to lay eggs; an example is that of the (NEW NCERT 12th Page No. 19) tallest flower of Amorphophallus. (NEW NCERT 12th Page No. 14) 108. (1) 116. (1) One of the rRNA acts as a catalyst for peptide Francis Crick proposed the Central dogma in bond formation, which is an example of RNA molecular biology, which states that the genetic enzyme (ribozyme). information flows from DNA → RNA → Protein. (NEW NCERT 12th Page No. 108) (NEW NCERT 12th Page No. 82) 109. (4) 117. (3) In water pollination, pollen grains in many such Funicle A stalk which attaches ovule to species are long, ribbon like and they are carried the placenta passively inside the water; some of them reach the Micropyle A small pore in the seed coat stigma and achieve pollination. Majority of insect- Chalaza The basal part of the ovule pollinated flowers are large, colourful, fragrant Integuments One or two protective envelopes and rich in nectar. of the ovule (NEW NCERT 12th Page No. 13, 14) (NEW NCERT 12th Page No. 09) 118. (4) the mature seed (e.g. castor and coconut) and be In eukaryotes, when the small subunit encounters used up during seed germination. an mRNA, the process of translation of the (NEW NCERT 12th Page No. 19) mRNA to protein begins. (NEW NCERT 12th Page No. 99) 126. (3) Taylor and DNA replicates semi- 119. (4) colleagues conservatively In western countries, a large number of pollen Hershey and DNA is the genetic material products in the form of tablets and syrups are Chase available in the market. Pollen consumption has Griffith Transforming principle been claimed to increase the performance of Avery, MacLeod Biochemical characterisation athletes and race horses. McCarty of ‘transforming principle’ (NEW NCERT 12th Page No. 08) (NEW NCERT 12th Page No. 93) 120. (4) 127. (2) A molecule that can act as a genetic material must The placenta is located inside the ovarian cavity fulfill the following criteria: (locule). (i) It should be able to generate its replica (NEW NCERT 12th Page No. 08) (Replication). (ii) It should be stable chemically and structurally. 128. (2) (iii) It should provide the scope for slow changes The unequivocal proof of DNA as genetic (mutation) that are required for evolution. material came from studies on a bacteriophage (iv) It should be able to express itself in the form (Virus that infects bacteria). The experiments of 'Mendelian Characters’. performed by Alfred Hershey and Martha Chase. (NEW NCERT 12th Page No. 87) (NEW NCERT 12th Page No. 85) 121. (4) 129. (3) Some plants such as Viola (common pansy), Oxalis, There are several records of very old yet viable seeds. and Commelina produce two types of flowers – The oldest is that of a lupine, Lupinus arcticus chasmogamous flowers which are similar to flowers excavated from Arctic Tundra. The seed germinated of other species with exposed anthers and stigma, and flowered after an estimated record of 10,000 years of dormancy. A recent record of 2000 years old and cleistogamous flowers which do not open at all. viable seed is of the date palm, Phoenix dactylifera (NEW NCERT 12th Page No. 12) discovered during the archeological excavation at King Herod’s palace near the Dead Sea. 122. (3) (NEW NCERT 12th Page No. 22) The DNA sequence coding for tRNA or rRNA molecule define a gene. A gene is defined as the 130. (1) functional unit of inheritance. Cistron is a segment The discontinuously synthesised fragments are of DNA coding for a polypeptide. In eukaryotes, the later joined by the enzyme DNA ligase. monocistronic structural genes have interrupted (NEW NCERT 12th Page No. 90) coding sequences – the genes in eukaryotes are split. (NEW NCERT 12th Page No. 93) 131. (4) Parthenocarpy can be induced through the 123. (2) application of growth hormones and such fruits The moth deposits its eggs in the locule of the ovary are seedless. and the Yucca flower, in turn, gets pollinated by the (NEW NCERT 12th Page No. 21) moth. The larvae of the moth come out of the eggs as the seeds start developing. 132. (4) (NEW NCERT 12th Page No. 14) In the post-transcriptional modification step called capping, an unusual nucleotide called methyl 124. (3) guanosine triphosphate is added to the 5’ end of Prior to the work of Oswald Avery, Colin hnRNA. MacLeod and Maclyn McCarty (1933 – 44), the (NEW NCERT 12th Page No. 95) genetic material was thought to be a protein. (NEW NCERT 12th Page No. 85) 133. (2) The innermost wall layer of microsporangium is the 125. (2) tapetum. It nourishes the developing pollen grains. Endosperm may either be completely consumed Cells of the tapetum possess dense cytoplasm and by the developing embryo (e.g., pea, groundnut, generally have more than one nucleus. beans) before seed maturation or it may persist in (NEW NCERT 12th Page No. 05) 134. (1) play an important role in guiding the pollen tubes The technique of DNA Fingerprinting was into the synergid. initially developed by Alec Jeffreys. He used a (NEW NCERT 12th Page No. 11) satellite DNA as probe that shows very high degree of polymorphism. It was called as Variable 142. (3) Number of Tandem Repeats (VNTR). The size of The ribosome consists of structural RNAs and VNTR varies in size from 0.1 to 20 kb. about 80 different proteins. (NEW NCERT 12th Page No. 106) (NEW NCERT 12th Page No. 99) 135. (3) 143. (1) Tassels wave in wind to trap Corn cob pollen grains Fllower 6 feet in height Amorphophallus Multicarpellary, apocarpous Michelia gynoecium Insect or wind pollinated Water hyacinth aquatic plant (NEW NCERT 12th Page No. 09, 13, 14) SECTION-B Pollination by water in Vallisneria (NEW NCERT 12th Page No. 14) 136. (1) In eukaryotes, the regulation could be exerted at 144. (1) (i) transcriptional level (formation of primary The goal of HGP is to identify all the approximately transcript), 20,000 – 25,000 genes in human DNA. (ii) processing level (regulation of splicing), (NEW NCERT 12th Page No. 102) (iii) transport of mRNA from nucleus to the cytoplasm, 145. (1) (iv) translational level. z Gene beta-galactosidase (NEW NCERT 12th Page No. 99) y Gene Permease a Gene Transacetylase 137. (4) i Gene Repressor protein In an embryo sac three cells are at the chalazal (NEW NCERT 12th Page No. 101) end and are called the antipodals. (NEW NCERT 12th Page No. 11) 146. (3) Sporopollenin is the main component of exine 138. (3) wall layer of pollen grain. In eukaryotes, the replication of DNA takes place (NEW NCERT 12th Page No. 07) at S-phase of the cell-cycle. A failure in cell division after DNA replication results into 147. (1) polyploidy(a chromosomal anomaly). The technique of DNA Fingerprinting was (NEW NCERT 12th Page No. 91) initially developed by Alec Jeffreys. (NEW NCERT 12th Page No. 106) 139. (2) Transfer of pollen grains from anther to the 148. (3) stigma of a different plant. This is the only type of Occasionally, in some seeds such as black pepper pollination which during pollination brings and beet, remnants of nucellus are also persistent. genetically different types of pollen grains to the This residual, persistent nucellus is the perisperm. stigma. (NEW NCERT 12th Page No. 20) (NEW NCERT 12th Page No. 12) 149. (1) 140. (4) During the human genome project, the sequence of There are no tRNAs for stop codons that are chromosome 1 was completed only in May 2006. UAA, UAG and UGA. AUG has a tRNA called (NEW NCERT 12th Page No. 103) initiator tRNA. (NEW NCERT 12th Page No. 98) 150. (3) Angiosperms exhibit double fertilisation because 141. (3) two fusion events occur in each embryo sac, The synergids have special cellular thickenings at namely syngamy and triple fusion. the micropylar tip called filiform apparatus, which (NEW NCERT 12th Page No. 24)  [AITS -01 | 12th-NEET | 15-09-2024] (ZOOLOGY) SECTION-A 157. (4) Sperm is a microscopic structure composed of a 151. (4) During secretory phase of menstrual cycle the head, neck, a middle piece and a tail. It is produced levels of estrogen and progesterone increases in seminiferous tubule. because corpus luteum begins to secrete large (NEW NCERT 12th Page No. 27) amounts of progesterone and some amount of estrogen. These hormones helps in maintenance of 158. (4) endometrium to support potential pregnancy, whereas Lactational amenorrhea method is based on the fact level of LH and FSH decreases during this phase. that ovulation and therefore, the cycle do not occur (NEW NCERT 12th Page No. 34) during the period of intense lactation following parturition. Thus, as long as the mother breastfeeds 152. (2) the child fully, the chances of conception are In Syphilis, Gonorrhoea and Genital warts sex almost nil. However, this method has been reported organs are affected. In AIDS, sex organs are not to be effective only up to a maximum period of six affected but, deficiency of immune system occurs months following parturition. which provide suitable condition for various (NEW NCERT 12th Page No. 44) diseases to attack body. (NEW NCERT 12th Page No. 47) 159. (2) 153. (3) FSH acts on the Sertoli cells and stimulates The uterus is single and it is also called womb. The secretion of some factors which help in the process wall of the uterus has three layers of tissue. The of spermiogenesis. external thin membranous perimetrium, middle (NEW NCERT 12th Page No. 31) thick layer of smooth muscle, myometrium and inner glandular layer called endometrium that lines 160. (1) the uterine cavity. Natural methods work on the principle of avoiding (NEW NCERT 12th Page No. 30) chances of ovum and sperms meeting i.e. preventing fertilisation. 154. (2) (NEW NCERT 12th Page No. 44) An ideal contraceptive should be user-friendly, easily available, effective and reversible with no or 161. (2) least side-effects. It also should in no way interfere The second meiotic divisions of the mammalian with the sexual drive, desire and/or the sexual act ovum occurs when sperm enters the secondary of the user. Effectiveness is critical in preventing oocyte which results in formation of ovum and unintended pregnancies, and a contraceptive that is least effective would not reliably serve its purpose. second polar body. (NEW NCERT 12th Page No. 43) (NEW NCERT 12th Page No. 35, 36) 155. (2) 162. (2) List-I List-II Administration of progestogens or progestogen- Interstitial space Leydig cells estrogen combination pills or IUDs within 72 hours Seminiferous tubule Highly coiled tube (i.e. 3 days) of coitus are very effective as Sertoli cells Nutrition to germ cells emergency contraceptives as they could be used to Male germ cells Spermatogonia avoid possible pregnancy due to rape or casual (NEW NCERT 12th Page No. 27) unprotected intercourse. (NEW NCERT 12th Page No. 45) 156. (1) Gametogenesis in human females i.e., Oogenesis is 163. (2) initiated during the embryonic development stage Spermatogonia and primary spermatocytes are when a couple of million gamete mother cells diploid whereas secondary spermatocytes and (oogonia) are formed within each fetal ovary; no sperms are haploid and contains 23 chromosomes. more oogonia are formed and added after birth. (NEW NCERT 12th Page No. 31) (NEW NCERT 12th Page No. 32) 164. (3) 170. (4) Additional benefit of condom is that it protect the IUDs increase phagocytosis of sperms within the user from contracting STIs and AIDS. uterus and the Cu ions released suppress sperm (NEW NCERT 12th Page No. 44) motility and the fertilising capacity of sperms. (NEW NCERT 12th Page No. 44) 165. (3) The shape of the uterus is like an inverted pear. The 171. (4) wall of the uterus has three layers of tissue. The Human chorionic gonadotropin (hCG) and human placental lactogen (hPL) are secreted by placenta external thin membranous perimetrium, middle only. thick layer of smooth muscle, myometrium and (NEW NCERT 12th Page No. 37) inner glandular layer called endometrium that lines the uterine cavity. 172. (3) (NEW NCERT 12th Page No. 30) IUDs are ideal contraceptives for the females who want to delay pregnancy and/or space children. It 166. (4) is one of most widely accepted methods of Diaphragms, cervical caps and vaults are barriers contraception in India. made of rubber that are inserted into the female (NEW NCERT 12th Page No. 45) reproductive tract to cover the cervix during coitus. They prevent conception by blocking the entry of 173. (2) sperms through the cervix. The oviducts (fallopian tubes), uterus and vagina (NEW NCERT 12th Page No. 44) constitute the female accessory ducts. (NEW NCERT 12th Page No. 29) 167. (3) The first menstruation begins at puberty and is 174. (2) called menarche. In human beings, menstrual The zygote or early embryos (with upto 8 cycles ceases around 50 years of age; that is termed blastomeres) could be transferred into the fallopian as menopause. tube (ZIFT-zygote intra fallopian transfer) and embryos with more than 8 blastomeres, into the (NEW NCERT 12th Page No. 35) uterus (IUT - intra uterine transfer), to complete its further development. 168. (3) (NEW NCERT 12th Page No. 48) Hormone-releasing IUDs are designed to provide contraception by releasing hormones directly into 175. (3) the uterus. Progestasert is a hormone-releasing Rapid secretion of LH leading to its maximum IUD. It contains progesterone (a type of progestin) level during the mid-cycle called LH surge induces that is released into the uterus to prevent rupture of Graafian follicle and thereby the release pregnancy. The hormone thickens cervical mucus of ovum (ovulation). and thins the endometrial lining, reducing the (NEW NCERT 12th Page No. 35) likelihood of implantation. (NEW NCERT 12th Page No. 44) 176. (2) Out of the listed assisted reproductive technologies 169. (2) (ARTs), three involve in vitro fertilization, where During fertilisation, a sperm comes in contact with fertilization occurs outside the body in a the zona pellucida layer of the ovum and induces laboratory: ZIFT (Zygote Intrafallopian Transfer), changes in the membrane that block the entry of ICSI (Intracytoplasmic Sperm Injection), and IUT additional sperms. Thus, it ensures that only one (Intrauterine Transfer). These techniques require the manipulation and fertilization of the egg sperm can fertilise an ovum. The entry of sperm outside the fallopian tubes or uterus before transfer. activates the secondary oocyte to completes second (NEW NCERT 12th Page No. 48) meiotic division. During fertilisation haploid nuclei of sperm and 177. (4) haploid nuclei of ovum fused to form diploid 100 ova are produced from 100 secondary oocytes nuclei. During entry of sperm into ovum all and 200 sperms are produced from 100 secondary chromosomes enter the egg. spermatocytes. (NEW NCERT 12th Page No. 35) (NEW NCERT 12th Page No. 31, 32) 178. (2) 185. (3) In vitro fertilisation (IVF) is the fertilisation The signals for parturition originate from the fully occurring outside the body in almost similar developed foetus and the placenta which induce conditions as that in the body whereas in vivo mild uterine contractions called foetal ejection fertilization is fertilization that occurs inside the reflex. This triggers release of oxytocin from the female's body. (NEW NCERT 12th Page No. 46) maternal pituitary. (NEW NCERT 12th Page No. 38) 179. (2) SECTION-B List-I List-II Trophoblast Outer layer of blastocyst 186. (2) Cleavage Mitotic division of zygote List-I List-II Inner cell mass Group of cells that would Nirodh Sheath of latex differentiate as embryo Diaphragm Covers cervix Implantation Embedding of blastocyst in Multiload 375 Contains copper the endometrium (NEW NCERT 12th Page No. 36, 37) Implant Placed under skin (NEW NCERT 12th Page No. 44) 180. (2) The correct order of events of human reproduction 187. (1) is: Gametogenesis → Insemination → Fertilisation Isthmus is the part of fallopian tube. Pills have to → Implantation → Gestation → Parturition. be taken daily for a period of 21 days starting Option (2) incorrectly places fertilization before insemination and gametogenesis. preferably within the first five days of menstrual (NEW NCERT 12th Page No. 26) cycle. After a gap of 7 days (during which menstruation occurs) it has to be repeated in the 181. (2) same pattern till the female desires to prevent The testis is covered by a dense covering. Each conception. testis has about 250 compartments called testicular (NEW NCERT 12th Page No. 44, 45) lobules. Each lobule contains one to three highly coiled seminiferous tubules in which sperms are produced. 188. (4) (NEW NCERT 12th Page No. 27) A functional mammary gland is characteristic of all female mammals. Acrosome is present in head of 182. (3) sperm. Mons pubis is a cushion of fatty tissue covered by (NEW NCERT 12th Page No. 31) skin and pubic hair in females. It is not a part of the internal genitalia, and the cushion is made up of fat, 189. (4) not proteins. (NEW NCERT 12th Page No. 30) Secondary oocyte is actually a haploid cell, not diploid. It is formed as a result of meiosis-I, not 183. (3) meiosis-II. During ovulation, the secondary oocyte Artificial insemination is a technique where the is released and will only complete meiosis-II if semen collected either from the husband or a fertilization occurs. healthy donor is artificially introduced either into (NEW NCERT 12th Page No. 32) the vagina or into the uterus. (NEW NCERT 12th Page No. 48) 190. (1) 184. (3) Copper-T is an effective contraceptive device in In human beings, after one month of pregnancy, the human females. It increase phagocytosis of sperms embryo’s heart is formed. The first sign of growing within the uterus and the Cu ions released suppress foetus may be noticed by listening to the heart sperm motility and the fertilising capacity of sound carefully through the stethoscope. By the sperms. In barrier methods, ovum and sperms are end of the second month of pregnancy, the foetus prevented from physically meeting with the help of develops limbs and digits. The first movements of the foetus and appearance of hair on the head are barriers. Cu-T does not blocks sperm from traveling usually observed during the fifth month. upward from the vagina into the fallopian tubes. (NEW NCERT 12th Page No. 38) (NEW NCERT 12th Page No. 44) 191. (4) 196. (3) The sequence of formation of spermatozoa is: Spermatogonia → primary spermatocytes → secondary spermatocytes → spermatid → spermatozoa (NEW NCERT 12th Page No. 31) 192. (2) A rapid decline in death rate, maternal mortality rate (MMR) and infant mortality rate (IMR) as well as an increase in number of people in reproducible In the given figure, B represents the plug of age cause increase in population but increased IMR cervical mucus. and increased MMR will cause decline in growth (NEW NCERT 12th Page No. 37) rate. (NEW NCERT 12th Page No. 43) 197. (2) The mode of action of implant is similar to that of 193. (3) pills and their effective periods are much longer. All techniques of IVF require extremely high (NEW NCERT 12th Page No. 45) precision handling by specialised professionals and expensive instrumentation. Therefore, these 198. (1) facilities are presently available only in very few The edges of the infundibulum possess finger-like centres in the country. Obviously their benefits is projections called fimbriae, which help in affordable to only a limited number of people. collection of the ovum after ovulation. (NEW NCERT 12th Page No. 48) (NEW NCERT 12th Page No. 29) 194. (4) 199. (2) List-I List-II Administration of progestogens or progestogen- Umbilical Connects the placenta to embryo estrogen combinations or IUDs within 72 hours of cord coitus have been found to be very effective as Placenta Facilitates supply of oxygen and emergency contraceptives as they could be used to nutrients to the embryo avoid possible pregnancy due to rape or casual Chorionic Finger like projections on trophoblast unprotected intercourse. villi (NEW NCERT 12th Page No. 45) Ovary Secretes relaxin hormone (NEW NCERT 12th Page No. 37) 200. (3) The uterus opens into vagina through a narrow 195. (1) cervix. The cavity of the cervix is called cervical Lactational amenorrhea is a natural method of canal which alongwith vagina forms the birth contraception. As no medicines or devices are used canal. (NEW NCERT 12th Page No. 30) in natural methods of contraception, side effects are almost nil. Chances of failure, though, of this method are also high compared to other methods like vasectomy, condoms, or IUDs. (NEW NCERT 12th Page No. 44) PW Web/App - https://smart.link/7wwosivoicgd4 Library- https://smart.link/sdfez8ejd80if