When certain tomato plants are kept in a dark room for a few days,they develop an albinism-like color. What is this phenomenon called?

Which of the following is the primary motive force responsible for growth?

Auxanometer is used to detect

Identify the correct and incorrect statements from the following.
$(i)$ $17,500$ new cells are produced per hour by a single maize root apical meristem.
$(ii)$ With the help of length,growth of pollen tube is measured.
$(iii)$ The growth of the leaf is measured in terms of volume.
$(iv)$ Cells in a watermelon may increase in size by up to $3,50,000$ times.

Growth is defined as a change which is

The process of growth is determined by