The germination of pollen grain takes place on __________ of the flower.

Calyx

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Corolla

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Anther

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Stigma

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Solution

The correct option is A Stigma
Once the pollen grain lands on the stigma(through pollination) of a receptive flower (or a female cone in gymnosperms), it takes up water and germinates.
Pollen germination is facilitated by hydration on the stigma, as well as by the structure and physiology of the stigma and style.
Hence The germination of pollen grain takes place on the Stigma of the flower.
So, the correct answer is 'Stigma'.

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