Parts A, B, C and D of the human eye are shown in the diagram.Select the option which gives correct identification along with its functions/characteristics:
Correct answer: C. A - Retina - Contains photoreceptors i.e.rods and cones.
- A. C-Aqueous chamber - Reflects the light which does not pass through the lens
- B. D- Choroid - Its anterior part forms the ciliary body
- C. A - Retina - Contains photoreceptors i.e.rods and cones.
- D. B-Blind spot - Has only a few rods and cones.
Explanation
In the given figure, A is the retina which is the innermost layer, containing photoreceptors rods and cones. B is the blind spot. Optic nerves pierce through the retina at the blind spot. It has no visual cells. C is aqueous humour. It nourishes the cornea and lens both of which are avascular. D is the sclera. It is the outermost covering and maintains the shape of an eyeball. It also protects the inner layers of the eye.
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Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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