What is wrong?

Obturator occurs in the ovary

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Grass pollen grains are monosiphonous

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Tip of pollen tube contains dense cytoplasm

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Tip of the pollen tube contains callose plugs

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Solution

The correct option is D Tip of the pollen tube contains callose plugs
Callose plugs are periodically deposited at the walls of pollen tube to differentiate growing new tissues at tip region from the old evacuated tail regions. It plays an important role in fertilisation.
So, the correct option is D.

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