Question

Response of different organisms to the environmental rhythms of light and darkness is called?

Answer 1

the correct answer is phototropism

Answer 2

The movements or reflex actions of different organisms are dependent on various external stimulations.

Similarly,the light and darkness are one of the most most common external stimulations which causes reflex (slow) movements in different organisms.

This biological action is also known as the phototropism.And it is mostly observed in the plants.