Describe the log phase in geometrical growth.

Tropic movement is due to

In the given diagram,what do $A$ and $B$ indicate? Choose the correct option.

Which of the following is essential for plant growth?

During the phase of cell enlargement in plant growth,solute concentration favours . . . . . . .

Assertion $(S)$: Growth occurs when anabolic processes exceed catabolic processes.
Reason $(R)$: Growth is the result of metabolism.
$(A)$ Both $S$ and $R$ are true,and $R$ is the correct explanation of $S$.
$(B)$ Both $S$ and $R$ are true,but $R$ is not the correct explanation of $S$.
$(C)$ $S$ is true and $R$ is false.
$(D)$ $S$ is false and $R$ is true.