Growth of plants is different from the growth of animals in:

Which phase of a sigmoid curve explains the initial phase of growth when growth rate is very slow?

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.

The instrument by which the rate of growth of a stem is accurately measured is:

In geometrical growth,the lag phase is represented by:

Both animals and plants grow. Why do we say that growth and differentiation in plants is open and not so in animals? Does this statement hold true for sponges also?