The cells of plants showing frost hardness have:

What is a $Phytotron$?

The phase of maturation is characterised by:
$I.$ Cells attaining their maximal size
$II.$ Proper wall thickening and protoplasmic modification
$III.$ Rapid cell division
Select the correct option.

The maximum growth rate occurs in

Define the term: Circummutation.

Given below are two statements about plant growth.
Statement $I$: Curve for arithmetic growth is linear.
Statement $II$: Curve for geometric growth is exponential.
In the light of the above two statements,choose the most appropriate answer from the options given below.