"Eternity of life" means

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.

Given below are the life spans of various organisms. Find the correct option:

Why is reproduction essential for organisms? Describe its types.

How many main methods of reproduction are there?

Identify the incorrect statement.