The study of flowers is known as:

$A$ flower is always solitary when:

$A$: Androecium of $Cucurbita$ is synandrous.
$R$: Anthers as well as filaments of stamens are united throughout their whole length.

Which part is responsible for sexual reproduction in angiosperms?

Which whorls are essential in a flower?

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: