Choose the correct statement.

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(C) The correct statement is $C$. Photoreceptors in the human eye are unique because they are the only type of sensory cells that are relatively depol

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Photoreceptors in the human eye are depolarised during darkness and become hyperpolarised in response to the light stimulus.

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(C) The correct statement is $C$. Photoreceptors in the human eye are unique because they are the only type of sensory cells that are relatively depolarised (about $-35 \ mV$) when at rest (i.e.,in the dark),and they become hyperpolarised (to about $-70 \ mV$) in response to an adequate light stimulus. Nociceptors respond to potentially damaging stimuli that result in pain,not pressure. Meissner's corpuscles are a type of mechanoreceptor responsible for touch sensitivity,not thermoreception. Receptors generally produce graded potentials known as receptor potentials.

List-$I$	List-$II$
$A$. Fovea	$I$. Visible coloured portion of eye that regulates diameter of pupil.
$B$. Iris	$II$. External layer of eye formed of dense connective tissue.
$C$. Blind spot	$III$. Point of greatest visual acuity or resolution.
$D$. Sclera	$IV$. Point where optic nerve leaves the eyeball and photoreceptor cells are absent.

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