What is the process of increasing the number and mass of cells called?

Which one is the correct graph for arithmetic growth?

During the cell enlargement phase of growth,molecules of new cell wall material are inserted between the original molecules of the stretched wall. This process is known as:

In the expression,$W_1 = W_0 e^{rt}$,what do $W_1, W_0, r,$ and $t$ represent?

Why is plant growth indeterminate?

What is $P$ in the given curve?