Class 09 Biology - Reproduction - Exercises

Questions and Answers

1. A flower’s anthers are removed before it matures. Later, pollen from another plant of the same species is dusted onto its stigma and seeds are produced. Which process has been ensured here?

(i) Self-pollination (ii) Cross-pollination (iii) Fertilisation (iv) Tissue culture

2. Arrange the following stages of sexual reproduction in plants in the correct order:

(i) Pollen germination on stigma (ii) Fertilisation (iii) Pollination (iv) Formation of zygote

3. Assertion (A): The zygote formed after fertilisation immediately attaches to the uterus wall.

Reason (R): The uterus wall is always prepared to receive the zygote.

4. Why does asexual reproduction produce offspring that are genetically identical to the parent?

5. Explain why the menstrual cycle stops during pregnancy.

6. Why are flowers that bloom at night white or light in colour as compared to flowers that bloom during the day?

7. Why do vegetatively propagated plants tend to be more vulnerable to diseases than sexually reproduced plants?

8. If all flowers in a type of plant were only capable of self-pollination, how would it affect the genetic diversity over several generations?

9. A farmer wants to produce a large number of genetically identical plants quickly. Suggest suitable reproduction methods.

10. Pollen germination experiment:

(i) What hypotheses can be tested?

11. Pollination types in:

Tomato: Primarily self-pollination (stamens cover the stigma).
Wheat: Wind-pollination or self-pollination (flowers often open after pollination).
Papaya: Cross-pollination (since male and female flowers are often on separate trees).

12. Apple Orchard Experiment:

(i) Hypotheses?

Class 09 Biology - Reproduction - Exercises

Class 09 Biology - Reproduction - Exercises

Questions and Answers

1. A flower’s anthers are removed before it matures. Later, pollen from another plant of the same species is dusted onto its stigma and seeds are produced. Which process has been ensured here?

2. Arrange the following stages of sexual reproduction in plants in the correct order:

3. Assertion (A): The zygote formed after fertilisation immediately attaches to the uterus wall.

4. Why does asexual reproduction produce offspring that are genetically identical to the parent?

5. Explain why the menstrual cycle stops during pregnancy.

6. Why are flowers that bloom at night white or light in colour as compared to flowers that bloom during the day?

7. Why do vegetatively propagated plants tend to be more vulnerable to diseases than sexually reproduced plants?

8. If all flowers in a type of plant were only capable of self-pollination, how would it affect the genetic diversity over several generations?

9. A farmer wants to produce a large number of genetically identical plants quickly. Suggest suitable reproduction methods.

10. Pollen germination experiment:

11. Pollination types in:

12. Apple Orchard Experiment:

13. "Ovulation always happens on day 14." Critically examine.

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BioBot

Class 09 Biology - Reproduction - Exercises

Class 09 Biology - Reproduction - Exercises

Questions and Answers

1. A flower’s anthers are removed before it matures. Later, pollen from another plant of the same species is dusted onto its stigma and seeds are produced. Which process has been ensured here?

2. Arrange the following stages of sexual reproduction in plants in the correct order:

3. Assertion (A): The zygote formed after fertilisation immediately attaches to the uterus wall.

4. Why does asexual reproduction produce offspring that are genetically identical to the parent?

5. Explain why the menstrual cycle stops during pregnancy.

6. Why are flowers that bloom at night white or light in colour as compared to flowers that bloom during the day?

7. Why do vegetatively propagated plants tend to be more vulnerable to diseases than sexually reproduced plants?

8. If all flowers in a type of plant were only capable of self-pollination, how would it affect the genetic diversity over several generations?

9. A farmer wants to produce a large number of genetically identical plants quickly. Suggest suitable reproduction methods.

10. Pollen germination experiment:

11. Pollination types in:

12. Apple Orchard Experiment:

13. "Ovulation always happens on day 14." Critically examine.

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