The retina of nocturnal birds contains:

Select the correct option based on the given sentences regarding the mechanism of vision:
$(I)$ Light rays in the visible wavelength are focused on the retina through the cornea and lens.
$(II)$ It generates impulses in rods and cones.
$(III)$ Photosensitive pigment is composed of an opsin (protein) and retinal (an aldehyde of vitamin $A$).
$(IV)$ Light induces the dissociation of retinal and opsin.
$(V)$ This process causes a change in membrane permeability,as a result,potential differences are generated in the photoreceptor cells.

How many types of cones are present which are responsible for the colour differentiation?

During the night,when light intensity is low,it is detected by:

The function of the pupil is:

Choose the correct statement.