Briefly describe pollen pistil interaction clss 12 biology ch 2
Answers
All pollinations do not lead to a successful fertilization because for a successful fertilization, pistil of a flower has to recognize the pollen of same species. Therefore, interaction between pollen grains and stigma needs to be understood properly. Once compatible pollen is accepted by pistil, events for fertilization proceed, whereas incompatible pollens are rejected. This interaction where a pistil is capable of recognizing its pollen is the result of long term pollen-pistil interaction and chemicals released by pollen.
Events of pollen-pistil interaction proceeds as follows:
Landing of true pollen on compatible pistil.
Germination of pollen and formation of pollen tube where pollen grains release its contents.
Pollen tube growth through style of the pistil towards the ovary.
Entry of male gametes into the ovule and then to synergid.
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