The area of the plant which receives the stimulus is known as:

Which phase of a sigmoid curve explains the initial phase of growth when growth rate is very slow?

$A$ leaf of $20 \; cm^{2}$ grows $5 \; cm^{2}$ per hour and a leaf of $25 \; cm^{2}$ grows $5 \; cm^{2}$ per hour. The relative growth rate of leaf $A$ and $B$ respectively is:

When food supply is poor,the rate of growth is

Phytotron is a facility to

In plants,growth occurs by $...$ through their life span. Choose an appropriate option to complete the given $NCERT$ statement.