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?

IAIO and IB IO Signup and view all the answers

What does reproductive health encompass?

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. Signup and view all the answers

Name one method to prevent sexually transmitted infections?

Use of condoms 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."

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. 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?

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

What is test cross ?

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. Signup and view all the answers

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

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. Signup and view all the answers

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

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. Signup and view all the answers

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

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). Signup and view all the answers

Explain the significance of Mendel's law of segregation.

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. 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.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion Signup and view all the answers

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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Description

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.