Choose the correct pair.

'Unisexual male flower is called pistillate'. The above statement is

Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$:
Assertion $A$: $A$ flower is defined as a modified shoot wherein the shoot apical meristem changes to a floral meristem.
Reason $R$: The internode of the shoot gets condensed to produce different floral appendages laterally at successive nodes instead of leaves.
In the light of the above statements,choose the correct answer from the options given below:

The reproductive phase in plants begins with the formation of:

...... is the enlarged basal part of the gynoecium.

The structure of the androecium is formed by which of the following?