- List two reasons for the appearance of variations among the progeny formed by sexual reproduction.
- Name the part marked ‘A’ in the diagram alongside.
- How does ‘A’ reaches part ‘B’ ?
- State the importance of the part ‘C’.
- What happens to the part marked ‘D’ after fertilisation is over ?
Answer:
- Variation is seen among progeny formed by sexual reproduction because of:
- Involvement of two different individuals.
- Creation of new combination of variants.
- A-pollen or pollen grain.
- It reaches the stigma (B) by agents of pollination.
- C (pollen tube) helps male gamete to reach the egg (ovule).
- After fertilsation it converts into embryo.