Question

(a) How do you perceive the colour of an object?

(b) Which part of our body helps us in maintaining the body balance?

(c) How does the eye regulate the amount of light that falls on the retina?

Answer 1

a) Photoreceptors are cells that are sensitive to light. They are of two types – rods and cones. These are present in the retina. Cones help in distinguishing colours. There are three types of cone cells – those responding to green light, those responding to blue light, and those responding to red light. These cells are stimulated by different lights, from different sources. The combinations of the signals generated help us see the different colours.

b) The inner ear is part of an ear is responsible for maintaining the body balance. The vestibular apparatus and the semicircular canal is responsible for maintaining the balance of the body.

c) A pupil is like an aperture in an eye. It dilates in low light and constricts in intense light when the light falls on the retina.