Clinostat is employed in the study of

The efficiency index of growth in plants represents . . . . . . .

Plant growth is unique in being

Study the following statements:
$I.$ $O_2$ helps in releasing metabolic energy,which is essential for growth.
$II.$ Nutrients are required by plants for the synthesis of protoplasm.
$III.$ Change in temperature could be detrimental for the survival of an organism.
$IV.$ Light and gravity do not affect the stages of growth.
Choose the correct option.

Growth at the cellular level is the increase in the amount of:

Growth is defined as a change which is