What does $r$ represent in the equation $W_1 = W_0 e^{rt}$?

Increased growth per unit time is termed as

What is the effect of rubbing on a leaf?

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.

Which one of the following is not a characteristic of plant cells in the phase of elongation?

The plants,which are able to send their roots up to the fringe of water table are called