Question

Question 7 Answer briefly:

(a) How do you perceive the color 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?

Class - XI - Biology Chapter Neural Control and Coordination Page No. 329

Answer 1

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The Answer of your question is ->

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(a) The cones are responsible for color vision. There are three types of cones cells that respond to green light, blue light and red light according to their characteristics. 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 has three semi-circular canals forming cochlea. Cochlea is responsible for maintaining the body balance.

(c) Pupil is the small aperture surrounded by the the iris that regulates the amount of light entering the eye. This expand in case of low light and contract in case of intense light thereby regulating the amount of light falling on the retina.

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From MrMysterious

Answer 2

Answer:

• Colour vision is imparted by the cone cells that are found in the retina of the eye. Cone cells are of three types which respond to red, green and blue light respectively. At different wavelengths of light, different cone cells get triggered. Simultaneous stimulation of more than one kind of cone cells, causes the other colours to be detected. A sensation of white light is observed when all the three types of cone cells are triggered at the same time. This is how colour is perceived.

• The part of the body that helps in maintaining the body balance is the crista ampullaris which is located in the three semicircular canals, the macula sacculi found in the saccule of the inner ear and the macular utriculi found in the utricle.

• Pupil is an aperture located in the centre of the iris. Light enters the eye through this aperture.

The iris has two types of muscles, namely the radial smooth muscles and circular smooth muscles that check the amount of light falling on the retina. The pupil diminishes in size when the smooth circular muscles contract in bright light. Therefore, less amount of light falls on the retina. The pupil widens, when the light is dim, due to the contraction of the radial smooth muscles such that enough light is incident on the retina.