Pollen-pistil interaction is:

Describe pollen-pistil interaction.

When the pollen tube enters the embryo sac,it enters through the ..... cells.

When the pollen tube enters the ovule through the integuments,the process is called:

Identify the correct sequence of events of pollen-pistil interaction given below.
$(a)$ Pollen tube grows through the stigma,style and reaches the ovule.
$(b)$ Pollen grain lands on the stigma.
$(c)$ Pollen germinates to form pollen tube.
$(d)$ Pollen tube carrying $2$ male gametes enters the ovule.
Choose the correct option.

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 the egg apparatus.