Different growth phases result in a

Exponential growth can be expressed as

Define the following terms:
$(1)$ Growth
$(2)$ Growth rate

Find out the correct statement$(s)$.
$(a)$ Growth in plants is internal/intrinsic and open-ended.
$(b)$ Formation of cellular materials is called real or protoplasmic growth.
$(c)$ Plant growth is diffused only during the early embryonic stage.

In the exponential growth equation $W_1 = W_0 e^{rt}$,what does $r$ represent?

$A$ clinostat is used to study which of the following?