Examine the figures $A, B, C,$ and $D$ given below and select the right option for female sex organs.

Which of the following is a correctly matched pair regarding reproduction?

Choose the correct options from the following:
$I$. Annual and biennial plants show clear-cut vegetative,reproductive,and senescent phases.
$II$. Bamboo species flower only once in their life,generally after $50-100$ years.
$III$. $Strobilanthus$ $kunthiana$ is a monocarpic plant which flowers only once after $12$ years.

Which is the mode of reproduction in $Amoeba$?

$A$: Endogamy is common in the majority of animals.
$R$: Fusing gametes are quite different and develop from different individuals.

Explain the senescence phase.