Question

Growth of pollen tube towards ovule is ____ movement​

Answer 1

The growth of a pollen tube towards ovule is induced by a chemical (sugar) substance secreted by the ripened stigma of flower into the style towards ovary. It is an example of chemotropism, pollen grain responds to stimulus by growing a polen tube in downward direction, towards ovule for fertilisation.30-Aug-2020

Answer 2

Answer:

When a plant part moves in response to chemical stimulus, it is called Chemotropism.

Here the stimulus is chemical.

For example, the growth of pollen tube towards the ovule during fertilisation in a flower is called positive chemotropism.

When a plant part moves in response to water, it is called Hydrotropism.

Explanation:

Hence, the answer is Chemotropism.

Hope it helps.