Question

Name the part of the eye that
a) Controls the amount of light entering the eye.
b) Determines the colour of the eye.
c) Holds the eye lens in its position​

Answer 1

Parts of eyes that control these functions are-

1) iris through the pupil

2) iris.

3) ciliary muscle

•Iris is pigmented part of eye.

•In the centre it has hole, through which light enters the eye and reaches retina.

•Outermost part of eye is cornea which focuses the light entering to the lens.

•Iris controls the amount of light entering the eye, by dilating or constricting the pupil.

•Iris has colored pigments, which imparts external color to eyes, which has number of varieties.

•Entered light has to reach retina, which has photoreceptor cells namely rods and cones.

•Lens focuses the light, so that image forms on retina.

•To focus lens has to change the shape, which it does so with the help of muscle fibres which hold it in position.

Answer 2

a) Iris and pupil

b) Iris  

c) Suspensor ligament.

Explanation:  

• Iris is projection from the ciliary muscle of the eyes. The space between the Iris on the either side from the pupil.  

• The Iris and pupil controls the amount of light which should enter the eye. The colour of the eye is determined by the different types of pigment which is present in the iris.  

• The lens is kept in its position due to the suspension ligament. Paralysis of the suspension really coming results in the dislocation of the lens.

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