Question

growth of pollen tube​

Answer 1

Explanation:

Pollen tube growth is influenced by the interaction between the stigma-style and the pollen grain. The elongation of the tube is achieved with elongation of the cytoskeleton and it extends from the tip, which is regulated by high levels of calcium in the cytosol.

Answer 2

Answer:

The pollen tube emerges out from small pores in the pollen grain known as the germ pores. The pollen grain comprises of two layers, namely, intine and exine. The germ pores are the region where exine ( made of sporopollenin ) is absent. When the pollen lands on the stigma it germinates and the pollen tube comes out.

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