Define pollination. Explain the different types of pollination. List two agents of pollination. How does suitable pollination lead to fertilization?
Answer:
(i) The transfer of pollen grains from the anther of a stamen to the stigma of a carpel is called pollination.
(ii)
Different types of pollination are
|
Self Pollination |
Cross Pollination |
|
When the pollen grains from the anther of a flower is transferred to the stigma of the same flower or another flower on the same plant, it is called self pollination. |
When the pollen grains from the anther of a flower on a plant is transferred to the stigma of a flower on a similar plant, it is called cross pollination. |
(iii) Agents of pollination are:
- Wind
- Water
- Insects
- Animals
(iv) Pollination leads to fertilisation by
- Pollen grains reaching the stigma of the flower through the pollination process.
- After that pollen tube develops from pollen grain.
- The pollen grain slides down the pollen tube and enters the ovary where it meets the egg.
- The male gamete present in the pollen grain fuses with the female gamete present in the ovule. Thus, fertilisation takes place.
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