Question 1

What is a potential side effect of using hormonal pills as a contraceptive method?

Accepted Answer

Correct Option: B. Solution: Hormonal pills change the hormonal balance of the body, which can lead to side effects.

Question 2

What is the process called when pollen is transferred from the stamen to the stigma of the same flower?

Accepted Answer

Correct Option: B. Solution: Self-pollination occurs when pollen is transferred from the stamen to the stigma of the same flower.

Question 3

In the context of asexual reproduction, which of the following processes involves the formation of new individuals from outgrowths on the parent organism?

Accepted Answer

Correct Option: C. Solution: Budding is a form of asexual reproduction where new individuals form from outgrowths on the parent organism, as seen in organisms like Hydra.

Question 4

What is the primary reason for the body showing sexual maturation during adolescence?

Accepted Answer

Correct Option: B. Solution: The body shows sexual maturation during adolescence to develop specialized tissues for the creation of germ-cells necessary for sexual reproduction.

Question 5

Why is DNA copying an essential part of the process of reproduction?

Accepted Answer

Correct Option: C. Solution: DNA copying is essential because it introduces genetic variations, which can be beneficial for the survival of the species by allowing adaptation to changing environments.

Question 6

What is the role of the pollen tube in the reproduction of flowering plants?

Accepted Answer

Correct Option: A. Solution: The pollen tube grows from the pollen grain and travels through the style to reach the ovary, facilitating the transport of the male germ-cell to the female gamete for fertilization.

Question 7

Which of the following processes in flowering plants leads to the formation of seeds and fruits?

Accepted Answer

Correct Option: B. Solution: Fertilization in flowering plants involves the fusion of male and female gametes, leading to the formation of seeds and fruits.

Question 8

Which of the following contraceptive methods involves a surgical procedure to prevent fertilization?

Accepted Answer

Correct Option: D. Solution: Vasectomy or tubectomy are surgical methods that involve cutting or blocking the vas deferens in males or the fallopian tubes in females to prevent sperm from reaching the egg.

Question 9

In the process of multiple fission, how does Plasmodium reproduce?

Accepted Answer

Correct Option: C. Solution: Plasmodium reproduces by multiple fission, where it divides into many daughter cells simultaneously.

Question 10

During puberty, which of the following changes occur in both boys and girls?

Accepted Answer

Correct Option: B. Solution: During puberty, both boys and girls experience the growth of thick hair in new parts of the body such as armpits and the genital area. This is a common change associated with sexual maturation.

Question 11

Which of the following plants can be propagated through vegetative propagation?

Accepted Answer

Correct Option: D. Solution: Vegetative propagation is used for plants like sugarcane, roses, and grapes to grow new plants from parts like roots, stems, or leaves.

Question 12

In flowering plants, what is the primary function of the petals and sepals during reproduction?

Accepted Answer

Correct Option: B. Solution: Petals and sepals serve to attract pollinators and protect the reproductive organs of the flower. They do not directly participate in pollen production or seed development.

Question 13

How do condoms help in the prevention of sexually transmitted diseases?

Accepted Answer

Correct Option: C. Solution: Condoms provide a physical barrier that prevents the exchange of bodily fluids, thereby reducing the risk of transmitting infections.

Question 14

What is the primary reason DNA copying is essential during reproduction?

Accepted Answer

Correct Option: B. Solution: DNA copying is essential for reproduction as it introduces variations that are crucial for the survival of the species over time.

Question 15

Which of the following organisms undergoes binary fission in a definite orientation due to its whip-like structure?

Accepted Answer

Correct Option: B. Solution: Leishmania undergoes binary fission in a definite orientation because it has a whip-like structure at one end of the cell.

Question 16

Which of the following sexually transmitted diseases is caused by a viral infection?

Accepted Answer

Correct Option: C. Solution: Warts are caused by the human papillomavirus (HPV), making it a viral infection.

Question 17

Which of the following methods of contraception involves the use of a mechanical barrier?

Accepted Answer

Correct Option: C. Solution: Condoms act as a mechanical barrier to prevent sperm from reaching the egg.

Question 18

In the human male reproductive system, which structure is responsible for producing sperm and secreting the hormone testosterone?

Accepted Answer

Correct Option: C. Solution: The testis is responsible for producing sperm and secreting the hormone testosterone, which regulates sperm formation and brings about changes during puberty.

Question 19

What occurs in the human female reproductive system when the egg is not fertilized?

Accepted Answer

Correct Option: C. Solution: If the egg is not fertilized, the thickened lining of the uterus is not needed and is shed through the vagina as blood and mucous in a process called menstruation.

Question 20

Which of the following organisms reproduces through spore formation?

Accepted Answer

Correct Option: B. Solution: Rhizopus reproduces through spore formation, where spores are produced in sporangia and can develop into new individuals.

Question 21

In the context of asexual reproduction, consider a scenario where a Spirogyra filament is placed in an environment with varying light conditions. Which of the following statements correctly describes its reproduction process?

Accepted Answer

Correct Option: C. Solution: Spirogyra reproduces asexually through fragmentation, where the filament breaks into smaller pieces, each capable of growing into a new individual under suitable conditions.

Question 22

During sexual reproduction in humans, how is the problem of doubling the DNA amount in each generation resolved?

Accepted Answer

Correct Option: A. Solution: In sexual reproduction, meiosis ensures that germ cells have half the number of chromosomes. When two germ cells combine, the original chromosome number is restored.

Question 23

Which part of the male reproductive system is responsible for producing sperm?

Accepted Answer

Correct Option: B. Solution: The testis is responsible for producing sperm in the male reproductive system.

Question 24

Which of the following changes is common to both boys and girls during puberty?

Accepted Answer

Correct Option: B. Solution: During puberty, both boys and girls experience the growth of thick hair in new parts of the body such as armpits.

Question 25

Which of the following statements correctly distinguishes regeneration from budding in asexual reproduction?

Accepted Answer

Correct Option: B. Solution: Regeneration involves the formation of new individuals from body parts, such as when a Planaria is cut into pieces and each piece grows into a new organism. Budding involves the formation of new individuals from outgrowths, as seen in Hydra.

Question 26

During DNA replication in reproduction, what is the significance of the variations that occur in the DNA copies?

Accepted Answer

Correct Option: C. Solution: Variations in DNA copies during replication introduce genetic diversity, which is crucial for evolution and helps organisms adapt to changing environments.

Question 27

In the context of sexually transmitted diseases, why is it important to use protection even if one partner appears healthy?

Accepted Answer

Correct Option: A. Solution: Many sexually transmitted infections, such as HIV, can be asymptomatic in carriers, meaning they show no symptoms but can still be transmitted to a partner. Therefore, using protection is crucial to prevent the spread of these diseases.

Question 28

What is the primary reason for the body to show sexual maturation during adolescence?

Accepted Answer

Correct Option: B. Solution: The primary reason for sexual maturation during adolescence is to prepare the body for the creation of germ-cells, which are necessary for sexual reproduction. This is a specialized function that begins as the rate of general body growth slows down.

Question 29

Which of the following best describes the process of multiple fission in Plasmodium?

Accepted Answer

Correct Option: B. Solution: In multiple fission, as seen in Plasmodium, the parent cell divides to form many daughter cells simultaneously, which is a key reproductive strategy for the organism.

Question 30

Which of the following correctly describes the process that occurs when the egg is fertilised?

Accepted Answer

Correct Option: A. Solution: When the egg is fertilised, it forms a zygote that divides to form an embryo. The embryo is then implanted in the uterine lining, where it continues to develop into a fetus.

Question 31

In the process of budding, how does a new individual form?

Accepted Answer

Correct Option: B. Solution: In budding, a new individual forms as an outgrowth from the parent organism, as seen in organisms like Hydra.

Question 32

What is the primary purpose of meiosis in sexual reproduction?

Accepted Answer

Correct Option: B. Solution: Meiosis reduces the chromosome number in germ cells, allowing genetic variation through fertilization.

Question 33

Why might vegetative propagation be preferred for plants that have lost the ability to produce seeds, such as bananas and oranges?

Accepted Answer

Correct Option: B. Solution: Vegetative propagation is preferred for plants like bananas and oranges that cannot produce viable seeds, as it allows for the reproduction of these plants through other parts like roots, stems, or leaves.

Question 34

In flowering plants, which part is responsible for producing pollen grains?

Accepted Answer

Correct Option: C. Solution: The stamens are the male reproductive part of a flower and produce pollen grains.

Question 35

In the context of meiosis, which statement correctly describes the role of germ cells in sexual reproduction?

Accepted Answer

Correct Option: B. Solution: Meiosis in germ cells reduces the chromosome number by half, allowing for genetic diversity when two germ cells fuse during fertilization.

Question 36

What is the role of the placenta in the development of the embryo?

Accepted Answer

Correct Option: A. Solution: The placenta provides a large surface area for glucose and oxygen to pass from the mother to the embryo, facilitating its development.

Question 37

Which contraceptive method alters the hormonal balance to prevent the release of eggs?

Accepted Answer

Correct Option: C. Solution: Oral contraceptive pills work by changing the hormonal balance in the body to prevent ovulation, thereby preventing fertilization.

Question 38

Which of the following best describes the process and outcome when an egg is fertilized in the human female reproductive system?

Accepted Answer

Correct Option: C. Solution: When an egg is fertilized, it forms a zygote that begins to divide and develop into an embryo, which then implants in the uterine lining to continue its development.

Question 39

Which process in flowering plants involves the transfer of pollen from the stamen to the stigma of the same or different flower?

Accepted Answer

Correct Option: B. Solution: Pollination is the process of transferring pollen from the stamen to the stigma, which can occur within the same flower (self-pollination) or between different flowers (cross-pollination).

Question 40

Which of the following methods is most effective in preventing both pregnancy and sexually transmitted diseases during sexual intercourse?

Accepted Answer

Correct Option: C. Solution: Condoms are the most effective method for preventing both pregnancy and sexually transmitted diseases as they act as a barrier, preventing sperm from reaching the egg and reducing the risk of infection transmission.

Question 41

How does the process of meiosis contribute to genetic variation?

Accepted Answer

Correct Option: B. Solution: Meiosis allows for the combination of DNA from two different individuals, creating new combinations of variants.

Question 42

Which of the following scenarios best illustrates the advantage of genetic variation in a population?

Accepted Answer

Correct Option: B. Solution: Genetic variation allows some individuals in a population to survive and reproduce under changing environmental conditions, such as drought resistance in plants.

Question 43

Why is it necessary for germ cells to have half the number of chromosomes compared to somatic cells?

Accepted Answer

Correct Option: B. Solution: Germ cells have half the number of chromosomes so that when they combine during fertilization, the chromosome number is restored in the new generation.

Question 44

Why is vegetative propagation advantageous in agriculture?

Accepted Answer

Correct Option: D. Solution: Vegetative propagation is advantageous because it allows plants to bear flowers and fruits earlier, ensures genetic similarity to the parent plant, and is useful for plants that cannot produce seeds.

Question 45

What happens to the uterine lining if the egg is not fertilised?

Accepted Answer

Correct Option: C. Solution: If the egg is not fertilised, the uterine lining breaks down and is expelled from the body as blood and mucous, a process known as menstruation.

Question 46

In the process of binary fission in Amoeba, how does the organism ensure that each daughter cell receives a complete set of genetic material?

Accepted Answer

Correct Option: A. Solution: In binary fission, the nucleus of the Amoeba divides by mitosis, ensuring that each daughter cell receives an identical set of chromosomes.

Question 47

How does variation during DNA copying contribute to the evolution of species?

Accepted Answer

Correct Option: B. Solution: Variation during DNA copying introduces subtle differences in offspring, which can be beneficial for survival in changing environments, thus contributing to evolution.

Question 48

Which of the following statements best describes the role of the placenta during pregnancy?

Accepted Answer

Correct Option: B. Solution: The placenta is a specialized tissue that facilitates the exchange of nutrients and oxygen from the mother's blood to the embryo and removes waste products from the embryo to the mother's blood.

Question 49

Which of the following is an advantage of vegetative propagation in plants like sugarcane and roses?

Accepted Answer

Correct Option: B. Solution: Vegetative propagation allows for rapid production of plants as it bypasses the seed stage, enabling plants like sugarcane and roses to be propagated quickly and efficiently.

Question 50

Which of the following organisms can reproduce through regeneration?

Accepted Answer

Correct Option: B. Solution: Planaria can reproduce through regeneration, where the organism can grow into a new individual from its body parts.

Question 51

Fragmentation in Spirogyra results in the organism breaking into smaller pieces, each capable of growing into a new individual.

Accepted Answer

Answer: True. Solution: Fragmentation is a form of asexual reproduction in Spirogyra where the organism breaks into smaller pieces, and each piece grows into a new individual.

Question 52

If the egg is not fertilised, the uterine lining is shed during menstruation.

Accepted Answer

Answer: True. Solution: When the egg is not fertilised, the thickened lining of the uterus is not needed and is shed as blood and mucous, which is known as menstruation.

Question 53

DNA copying during reproduction introduces variations that are essential for evolution and species survival.

Accepted Answer

Answer: True. Solution: The process of DNA replication during reproduction introduces variations, which are crucial for evolution and the survival of species.

Question 54

Vegetative propagation allows plants that have lost the ability to produce seeds to reproduce and maintain genetic similarity to the parent plant.

Accepted Answer

Answer: True. Solution: Vegetative propagation is a form of asexual reproduction where parts like roots, stems, or leaves develop into new plants. This method is used for plants like sugarcane and roses, and it allows plants that cannot produce seeds to reproduce while maintaining genetic similarity to the parent plant.

Question 55

The process of meiosis results in the doubling of the DNA content in the new generation.

Accepted Answer

Answer: False. Solution: Meiosis actually reduces the DNA content by half in germ cells, preventing the doubling of DNA content in the new generation when two germ cells combine.

Question 56

Contraceptive methods can include mechanical barriers, hormonal pills, and surgical interventions.

Accepted Answer

Answer: True. Solution: Contraceptive methods are designed to prevent pregnancy and include mechanical barriers like condoms, hormonal pills that alter the body's hormonal balance, and surgical interventions such as vasectomy or tubal ligation.

Question 57

If the egg is not fertilised, the uterine lining is shed as menstruation.

Accepted Answer

Answer: True. Solution: When the egg is not fertilised, the thickened lining of the uterus, which was prepared to nourish a potential embryo, is not needed and is shed from the body as menstrual blood.

Question 58

In angiosperms, the male gamete is produced by the ovule and fuses with the female gamete present in the pollen grain.

Accepted Answer

Answer: False. Solution: In angiosperms, the male gamete is produced by the pollen grain and fuses with the female gamete present in the ovule during fertilization.

Question 59

DNA copying during reproduction is never completely accurate, leading to variations that are essential for evolution.

Accepted Answer

Answer: True. Solution: The process of DNA replication is not absolutely reliable, resulting in variations that contribute to evolution and species survival.

Question 60

In flowering plants, the process of pollination involves the transfer of pollen from the anther to the stigma.

Accepted Answer

Answer: True. Solution: Pollination is the process by which pollen is transferred from the male part of the flower (anther) to the female part (stigma) to enable fertilization.

Question 61

Using condoms during sexual intercourse can help prevent the transmission of sexually transmitted diseases such as gonorrhoea and HIV-AIDS.

Accepted Answer

Answer: True. Solution: Condoms act as a barrier method that reduces the risk of transmission of sexually transmitted diseases by preventing direct contact and exchange of bodily fluids.

Question 62

Binary fission in Amoeba involves the organism splitting into two equal halves.

Accepted Answer

Answer: True. Solution: Binary fission is a form of asexual reproduction where the organism divides into two equal parts, each becoming a new organism.

Question 63

In flowering plants, the process of pollination involves the transfer of pollen grains from the anther to the stigma, which can occur within the same flower or between different flowers.

Accepted Answer

Answer: True. Solution: Pollination is the process by which pollen grains are transferred from the anther to the stigma of a flower, either within the same flower (self-pollination) or between different flowers (cross-pollination).

Question 64

Binary fission in Amoeba occurs in a definite orientation similar to that in Leishmania.

Accepted Answer

Answer: False. Solution: Binary fission in Amoeba occurs in any plane, while in Leishmania, it occurs in a definite orientation due to its whip-like structure.

How do Organisms Reproduc..

Learning Objectives

Learning Objectives

Revision Notes & Summary

Chapter Notes

DNA Copying and Variation

Binary and Multiple Fission

Regeneration and Budding

Vegetative Propagation

Sexual Reproduction and Meiosis

Flowering Plant Reproduction

Human Reproductive Systems

Contraceptive Methods

Puberty and Sexual Maturation

Menstruation and Fertilisation Outcome

Reproductive Health and Sexually Transmitted Diseases

Fragmentation and Spore Formation

Exam Tips & Common Mistakes

Common Mistakes & Exam Tips

DNA Copying and Variation

Binary and Multiple Fission

Regeneration and Budding

Vegetative Propagation

Sexual Reproduction and Meiosis

Flowering Plant Reproduction

Human Reproductive Systems

Contraceptive Methods

Puberty and Sexual Maturation

Menstruation and Fertilisation Outcome

Reproductive Health and Sexually Transmitted Diseases

Fragmentation and Spore Formation

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Multiple Choice Questions

Q1.What is a potential side effect of using hormonal pills as a contraceptive method?

Correct Answer: B

Q2.What is the process called when pollen is transferred from the stamen to the stigma of the same flower?

Correct Answer: B

Q3.In the context of asexual reproduction, which of the following processes involves the formation of new individuals from outgrowths on the parent organism?

Correct Answer: C

Q4.What is the primary reason for the body showing sexual maturation during adolescence?

Correct Answer: B

Q5.Why is DNA copying an essential part of the process of reproduction?

Correct Answer: C

Q6.What is the role of the pollen tube in the reproduction of flowering plants?

Correct Answer: A

Q7.Which of the following processes in flowering plants leads to the formation of seeds and fruits?

Correct Answer: B

Q8.Which of the following contraceptive methods involves a surgical procedure to prevent fertilization?

Correct Answer: D

Q9.In the process of multiple fission, how does Plasmodium reproduce?

Correct Answer: C

Q10.During puberty, which of the following changes occur in both boys and girls?

Correct Answer: B

Q11.Which of the following plants can be propagated through vegetative propagation?

Correct Answer: D

Q12.In flowering plants, what is the primary function of the petals and sepals during reproduction?

Correct Answer: B

Q13.How do condoms help in the prevention of sexually transmitted diseases?

Correct Answer: C

Q14.What is the primary reason DNA copying is essential during reproduction?

Correct Answer: B

Q15.Which of the following organisms undergoes binary fission in a definite orientation due to its whip-like structure?

Correct Answer: B

Q16.Which of the following sexually transmitted diseases is caused by a viral infection?

Correct Answer: C

Q17.Which of the following methods of contraception involves the use of a mechanical barrier?

Correct Answer: C

Q18.In the human male reproductive system, which structure is responsible for producing sperm and secreting the hormone testosterone?

Correct Answer: C

Q19.What occurs in the human female reproductive system when the egg is not fertilized?

Correct Answer: C

Q20.Which of the following organisms reproduces through spore formation?

Correct Answer: B

Q21.In the context of asexual reproduction, consider a scenario where a Spirogyra filament is placed in an environment with varying light conditions. Which of the following statements correctly describes its reproduction process?