Question

In the diagram given below, show the path of a pollen tube from the pollen on the stigma into the embryo sac. Name the components of egg apparatus.

Answer 1

Path of a pollen tube into the embryo sac.

Path of a pollen tube into the embryo sac is as follows:

* The pollen tube grows through the tissues of the stigma and the style

* It then enters through the micropylar end into the ovule.

* Synergid cell of the egg apparatus secrete chemicals and direct the movement of the pollen tube inside the synergid through the filiform apparatus.

* Pollen tube penetrates and releases two male gametes into synergid cells.


Diagram


Components of egg apparatus.

The egg apparatus is composed of one egg and two synergid cells. It is present at the micropylar end of the embryo sac.