Question

Which of the following is not caused by a growth movement?

Options

• bending of the shoot of a plant in response to light

• closing up of leaves of a sensitive plant on touching with an object

• climbing up of a plant on an object by using tendrils

• movement of the root of a plant towards a source of water

Answer 1

closing up of leaves of a sensitive plant on touching with an object

Explanation:

The closing of leaves in the sensitive plant (Mimosa pudica) is a thigmonastic movement caused by changes in turgor pressure, not by growth. Therefore, it is not a growth movement. The other options are tropic (growth) movements.