Name: Pollination
Uploaded: 2019-07-19
Duration: 5 min 53 s
Description: Pollination is the act of transferring pollen grains from the male anther of a flower to the female stigma. Here, learn more about pollination and its types.

Question

Given below are sets of five terms each. Rewrite the terms in correct order in a logical sequence beginning with the term that is underlined:

Intine, Pollen tube, Exine, Tube nucleus, Male gametes.

Accepted Answer

The correct sequence:

Exine, Intine, Pollen tube, Tube nucleus, Male gametes

Exine: The exine is the outermost layer of a pollen grain wall. It provides protection to the pollen grain during its journey from the anther to the stigma of a flower.

Intine: The intine is the inner layer of the pollen grain wall. It is located beneath the exine and plays a role in pollen tube formation.

Pollen tube: After landing on the stigma of a compatible flower, a pollen grain hydrates and begins to germinate. It extends a slender tube known as the pollen tube through which the male gametes will travel to reach the female ovules.

Tube nucleus: Within the growing pollen tube, a nucleus known as the tube nucleus is present. This nucleus controls the growth and elongation of the pollen tube.

Male gametes: Once the pollen tube reaches the ovule, it releases the male gametes (sperm cells), which are necessary for fertilisation to occur.

Exercises

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