Structure of eye

Correct answer: A. In the retina

The retina is the light-sensitive inner layer at the back of the eye. It contains photoreceptors called rods and cones, which convert incoming light into nerve signals. These signals travel through the optic nerve to the brain for interpretation. The cornea helps focus light, while the eyelid and tear gland protect and lubricate the eye; they do not contain the main light receptors. Option A is correct.

Correct answer: A. It reduces the amount of light entering the eye

The governing concept is the pupil reflex, which regulates the amount of light reaching the retina. In bright conditions, circular muscles of the iris contract and make the pupil smaller. This limits incoming light and helps protect the retina while preventing excessive glare. Therefore option A is correct. Digestion, blood pumping, and sound detection are not functions of the pupil or iris.

Correct answer: A. Eye

The governing concept is sensory reception in the human eye. Photoreceptors called rods and cones are present in the retina, a light-sensitive layer at the back of the eye. They convert light into electrical nerve impulses, which travel through the optic nerve to the brain and form visual information. Thus option A is correct. The tongue detects taste, the nose detects smell, and the skin mainly detects touch, pressure, temperature, and pain.

Correct answer: A. यह प्रकाश ग्रहण करती है और इस पर प्रतिबिंब बनता है।

The retina is the light-sensitive layer at the back of the eye. The eye lens forms an image on it, and its photoreceptor cells convert light into nerve impulses that travel to the brain through the optic nerve. The iris, not the retina, mainly controls the amount of light entering the eye. Exam tip: remember the retina as the eye’s light-sensitive screen.