Auxanometer is used to detect

The cells in this zone attain their maximal size in terms of wall thickening and protoplasmic modifications.

. . . . . . curve is obtained for cells in culture.

Which of the following factors are essential for growth?
$I-$ Water,$II-$ Oxygen,$III-$ Nutrients,$IV-$ Temperature,$V-$ Light,$VI-$ Gravity

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.

Which type of growth is shown in the given figure?