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?

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Solution

Growth in plants and animals:

The growth in plants is called open growth as new cells are added by the activity of meristematic tissues. Due to the property of dedifferentiation, plants have unlimited growth throughout their life.

In animals, the growth stops after a particular age as the cells lose their ability of division and attain maturity. The totipotent cells are found in abundance in the embryonic stages of humans.

Growth in sponges:

Sponges have cellular level of organisation and have the power of regeneration. Hence, the statement holds true for them.

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Standard IX Biology

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