| Find out the correct sequence of events taking place in pollen-pistil interaction. |
| I. Pollen tube enters one of the synergids and bursts to release male gametes. |
| II. Pollen tube enters ovule through micropyle of ovary. |
| III. Pollen tube grows through the stigmatic tissue and then style. |
| IV. Pistil recognises the compatible pollen and accepts it. |
| Choose the correct option. |
A) \[IV\to III\to II\to I\]
B) \[IV\to II\to III\to I\]
C) \[I\to IV\to III\to II\]
D) \[III\to IV\to II\to I\]
Correct Answer: A
Solution :
[a] Pollen-pistil interaction includes Recognition of compatible pollen- The pistil has the ability to recognise the right compatible pollen of the same species and to reject the pollen grains that are incompatible either of same species or of other species. Growth of a pollen tube-The contents of the pollen then move into this tube. Entry of pollen tube into the ovule- After reaching the ovary, the pollen tube enters the ovule through one of synergids at micropylar end and release male gametes. Thus, the correct sequence of events taking place in pollen-pistil interaction is IV\[\to \]III\[\to \]II\[\to \]I.
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