CBSE Class 12 Biology Question Paper Set A
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Questions and Answers

After fertilized ovule of an angiosperm the cells in which n, 2n, 3n conditions respectively occur are?

  • None of these
  • antipodal cell, nucellus cell and endosperm
  • antipodal cell, zygote and endosperm (correct)
  • endosperm, nucellus cell and antipodal - d) endosperm antipodal cell, zygote

Where does fertilization occur in the human body?

  • Vagina
  • Ovary
  • Uterus
  • Fallopian tube (correct)

Which of the following is a contraceptive method?

  • ICSI
  • IVF
  • IUI
  • IUD (correct)

What is genotype of mother (blood group A) and father (blood group B). If blood group of child is O?

<p>IAIO and IB IO</p> Signup and view all the answers

What does reproductive health encompass?

<p>Reproductive health refers to the complete physical, mental, and social well-being in all matters relating to the reproductive system. It includes a variety of aspects such as family planning, prevention of sexually transmitted infections, and maternal health.</p> Signup and view all the answers

Name one method to prevent sexually transmitted infections?

<p>Use of condoms</p> Signup and view all the answers

Read the passage and answer the questions: "Mendel's experiments on pea plants laid the foundation for the laws of inheritance. He proposed that traits are inherited as discrete units called genes. His work explained the patterns of inheritance and the role of dominant and recessive alleles."

<p>Mendel's laws of inheritance provide a framework for understanding the transmission of traits from parents to offspring. The laws of segregation and independent assortment explain the inheritance patterns of genes.</p> Signup and view all the answers

A red flower plant crossed with white flower plant, in F1 generation only pink flowers are produced. Did Mendel's law follow explain?

<p>Yes, Mendel's law of incomplete dominance applies here. Incomplete dominance occurs when neither allele is completely dominant over the other.</p> Signup and view all the answers

What is test cross ?

<p>A test cross is a breeding experiment involving an individual with an unknown genotype and a homozygous recessive individual. By observing the phenotypes of the offspring, we can determine the genotype of the unknown individual.</p> Signup and view all the answers

Explain the process of double fertilization in angiosperms. And product of egg and polar nuclei after fertilization

<p>In angiosperms, double fertilization happens during the process of pollination. It involves the fusion of one sperm nucleus with the egg cell, resulting in a diploid zygote that develops into the embryo. The second sperm nucleus fuses with the two polar nuclei in the central cell, forming a triploid endosperm which nourishes the developing embryo.</p> Signup and view all the answers

Describe the stages of the menstrual cycle. And function of LH, FSH, and prolactin.

<p>The menstrual cycle typically consists of four phases: menstruation, follicular, ovulation, and luteal. LH (Luteinizing Hormone) triggers ovulation, FSH (Follicle-Stimulating Hormone) stimulates follicle growth, and prolactin plays a role in lactation by stimulating milk production.</p> Signup and view all the answers

In Honey bee male has grandfather but don't father prove it

<p>In honeybees, males (drones) develop from unfertilized eggs, which means they only have a mother but no father. This is due to a process called parthenogenesis. As a result, a drone's father is actually his grandfather (the queen bee that laid his egg).</p> Signup and view all the answers

Explain the significance of Mendel's law of segregation.

<p>Mendel's law of segregation states that alleles for a trait separate during gamete formation, and only one allele from each pair is passed down to each offspring. This ensures genetic diversity and variation.</p> Signup and view all the answers

Assertion: Pollination is necessary for fertilization in flowering plants. Reason: Pollination allows the transfer of pollen from the anther to the stigma.

<p>Both Assertion and Reason are correct and Reason is the correct explanation for Assertion (B)</p> Signup and view all the answers

Flashcards

Pollination

The process where a pollen grain from the anther of a flower is transferred to the stigma of the same or another flower.

Fertilization

The fusion of a sperm cell and an egg cell to form a zygote.

Stigma

The structure in an angiosperm flower that receives the pollen during pollination. It's the sticky top part of the pistil.

Anther

The male reproductive part of a flower responsible for producing pollen grains.

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Ovule

A structure within the ovary of a flower that contains the egg cell.

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Double Fertilization

The process where one sperm nucleus from the pollen tube fertilizes the egg cell, and the other sperm nucleus fertilizes the polar nuclei, forming the endosperm.

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Endosperm

The tissue that provides nourishment to the developing embryo inside a seed.

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Zygote

The offspring resulting from the fusion of gametes from two different parents.

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Sexual Reproduction

The process of reproduction involving the fusion of male and female gametes to produce a zygote.

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Haploid

The condition where the number of chromosomes in a cell is reduced to half the original number during gamete formation.

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Diploid

The condition where a cell contains the full set of chromosomes, typically two copies of each chromosome.

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Fruit

The mature ovary of a flower that encloses the seeds.

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Gene

The unit of inheritance that determines a specific trait.

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Allele

Alternate forms of a gene that occupy the same locus on homologous chromosomes.

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Dominant Allele

An allele that expresses its trait even when paired with a recessive allele.

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Recessive Allele

An allele that only expresses its trait when paired with another recessive allele.

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Genotype

The genetic makeup of an organism.

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Phenotype

The observable physical characteristics of an organism.

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Test Cross

A cross between an organism with an unknown genotype and an organism with a homozygous recessive genotype.

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Monohybrid Cross

A cross between two individuals who are heterozygous for the same trait.

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Dihybrid Cross

A cross between two individuals who are heterozygous for two different traits.

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Codominance

A mechanism of inheritance where both alleles contribute to the phenotype.

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Incomplete Dominance

A mechanism of inheritance where the heterozygous phenotype is intermediate between the homozygous phenotypes.

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Inheritance

The process by which genetic information is passed from one generation to the next.

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Mutation

A change in the genetic material of an organism.

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Pedigree

A chart that shows the inheritance of a trait over multiple generations.

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Recessive Disorder

A condition where an individual inherits two copies of the same recessive allele.

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Dominant Disorder

A condition where an individual inherits one dominant allele for a disorder.

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Karyotype

A set of chromosomes that represent the full genetic makeup of an organism.

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Study Notes

CBSE Board Question Paper / KV Schools Question Paper

  • Session: 2024-25
  • Class: 12
  • Subject: Biology (Set A)
  • Time: 1 hour 30 minutes
  • Total Marks: 40

Section 1: Competency Based Questions

  • Type 1: Multiple Choice Questions (4 marks each)
    • Q1: After fertilization, the cells in an angiosperm ovule exhibiting n, 2n, and 3n conditions respectively are... (options provided: antipodal cell/zygote/endosperm, etc.)
    • Q2: Fertilization in humans occurs in... (options given: ovary/uterus/fallopian tube/vagina)
    • Q3: A contraceptive method example... (options: IUD/IVF/IUI/ICSI)
    • Q4: Genotype of a mother (blood group A) and father (blood group B) if their child has blood group O? (options given)

Section 2: Passage-Based Questions

  • Type 2: Passage-Based Questions (1 mark each)
    • Q5: Reproductive health encompasses what?
    • Q6: Method to prevent sexually transmitted infections?

Section 3: Questions based on Mendel's Laws

  • Q7-Q8: Red and white flower plants, F1 generation, does Mendel's law apply? Explanation of test cross?

Section 4: CCT Questions

  • Q9: (2 marks) Double fertilization in angiosperms (explain and state the product).
  • Q9: Stages of the menstrual cycle & function of LH, FSH.
  • Q9: Mendel's law of segregation.

Section 5: Assertion & Reasoning

  • Q10 (4 marks): Assertion - Pollination is necessary for fertilization in flowering plants. Reason - Pollination allows transfer of pollen from anther to stigma. (Options: Both Assertion & Reason are correct; Assertion & Reason correct but Reason not correct explanation; Assertion correct but Reason incorrect)

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Test your knowledge with this comprehensive question paper for Class 12 Biology, designed for the CBSE Board for the 2024-25 session. The quiz includes multiple-choice questions and passage-based questions covering key concepts in reproductive health and fertilization. Perfect for students preparing for their exams.

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