Question

Specify the type of movement shown by growth of pollen tube towards ovule.

Answer 1

A pollen tube is a tubular structure produced by the male gametophyte of seed plants when it germinates. It acts as a conduit to transport the male gamete cells from the pollen grain—either from the stigma to the ovules at the base of the pistil or directly through ovule tissue in some gymnosperms.

Chemo-tropic movement can be seen during the growth of the pollen tube, where growth is always towards the ovules. The growth of a pollen tube down the style during fertilization in response to the presence of sugars in the style.