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?
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a) The retina or the innermost layer is sensitive to light . It contains two types of sense cells called rods and cones . The rod cells are sensitive to dim light but do not respond to colour . They contain the pigment rhodopsin . The cones cells are sensitive to bright light and are responsible for colour vision and they contain the pigment iodopsin.
b) Inner ear is the part of the body that helps in maintaining the body balance.
c) Pupil is the small aperture in the iris that helps in regulating the amount of light falling on the retina.
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Answer:
Explanation:
(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 colors. 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 colors.
(b) Vestibular apparatus is located in the internal ear, above the cochlea and helps in maintaining body balance. Crista and macula are the sensory spots of the vestibular apparatus controlling dynamic equilibrium.
(c) Pupil is the small aperture in the iris that regulates the amount of light entering the eye. Cornea, aqueous humour, lens, and vitreous humour act together and refract light rays, forcing them onto the photoreceptor cells of the retina.
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