FREE NEET Biology Practice MCQ Test: Neural Control And Coordination Exercise 2 Questions Answers With Detailed Explanations [PDF]

Answer: (d)

Fovea centralis is the most sensitive part of retina. It has high density of cones, but rods are not found.

Answer: (b)

The correct sequence for pathway of light through the eye to the retina is: conjunctiva - cornea - aqueous humor - pupil - lens - vitreous humor - yellow spot.

Answer: (c)

Answer: (b)

Answer: (b)

Answer: (b)

Answer: (d)

Answer: (c)

Answer: (b)

Answer: (a)

Answer: (c)

Brain is not involved in any reflex action (e.g., knee-jerk reflex) while the muscle spindle, inter neuron and motor neutron are the part of reflex arc.

Answer: (a)

Answer: (d)

Fovea is a small depression in the centre of macula lutea. It has only cone cells. They are devoid of rod cells. Hence, fovea is the place of most distinct vision.

Answer: (d)

In response to sudden bright light, pupil constricts by the constriction of sphinctor pupillae muscles through parasympathetic nervous system, in order to protect retina from possible injury against bright light.

Answer: (c)

Answer: (a)

Answer: (d)

Answer: (b)

Answer: (c)

The rod cells of eye contain a purplish pigment called visual purple, or rhodopsin. They function in dim light and at night. Bright light splits rhodopsin into a lipoprotein scotopsin and a carotenoid pigment retinene. The splitting of rhodopsin depolarizes the rod cell. In the dark, rhodopsin is resynthesized from scotopsin and retinene. This process is called "dark adaptation." It makes the rods functional. It takes some time for rhodopsin to be reformed. This is why on entering a dark room at daytime or on coming out of a well lighted room at night, we feel blind for a while. When we go from darkness into bright light, we feel difficulty in seeing properly for a moment till rhodopsin is bleached and cones become functional.

Answer: (d)

Language comprehension is a function of cerebrum. Cerebellum coordinates and controls rapid muscular activities such as running, typing, etc. Although it does not initiate such voluntary movements, but it is an important centre for coordinating movements and for controlling posture and balance. Cerebellum's function is almost exclusively motor; but it is also implicated in some forms of learning.