The growth in plants is

Sleep movements in $Samanea \text{ } saman$ are regulated by

Elongation of roots:
$a.$ Occurs at a constant rate
$b.$ Can be expressed by equation $W_t = W_0 e^{rt}$
$c.$ Shows arithmetic growth pattern

When young plants are grazed too heavily,they get killed because of

The total time in which growth occurs is called

Choose the correct statement.