Choose the correct statement.
(1) Nociceptors respond to changes in pressure

(2) Meissner's corpuscels are thermoreceptors

(3) Photoreceptors in the human eye are depolarised during darkness and become hyperpolarised in response to the stimulus 

(4) Receptors do not produce graded potentials

A person is wearing spectacles with concave lenses for correcting vision. While not using

the glasses, the image of a distant object in his case will be formed.

1. on the blind spot

2. behind the retina

3. in front of the retina

4. on the yellow spot.

These are events of mechanism of vision. Arrange them in order.

a. Light rays are focussed on retina

b. Dissociation of the retinal and of opsin

c. Generation of impulses in rods and cones

d. Changes in the structure of the opsin

e. Generation of potential difference

f. Change in membrane permeability

g. Transmission of action potential by the optic nerves to the visual cortex area of the brain

h. Generation of action potential in photoreceptors

i. image formation in retina and recognition based on earlier memory and experience.

Photosensitive compound in the human eye is made up of: