In the chemistry of vision in mammals, the
photosensitive substance is called
(a) rhodopsin

1) (b) melanin

(c) sclerotin

(d) retinol. (1997)

When we migrate from dark to light, we fail to see
for sometime but after a time visibility becomes
normal. It is example of
(a) accomodation

2) (b) adaptation

(c) mutation

(d) photoperiodism.
(2001)

Bowman’s glands are found in
(a) juxtamedullary nephrons
(b) olfactory epithelium
(c) external auditory canal
(d) cortical nephrons only. (2006)

Select the answer with correct matching of the
structure, its location and function.
Structure                                          Location                                        Function
(a) Eustachian                                Anterior                                        Equalizes air
tube                                               part of                                               pressure on
internal ear                                       either sides of
tympanic
membrane
(b) Cerebellum                           Midbrain                                            Controls
respiration and
gastric secretions
(c) Hypothal                                Forebrain                                        Controls body       amus                                                                                                          temperature,
urge for eating
and drinking
(d) Blind spot                                Near the place                             Rods and cones
where optic                                  are present but
nerve leaves                                  inactive here
the eye                                                       (Mains 2010)

Which of the following statements is the
characteristics of human cornea?
(a) It is secreted by conjuctiva and glandular layer.
(b) It is a lacrimal gland which secrete tears.
(c) Blood circulation is absent in cornea.
(d) In old age it becomes the cause of cataract.
(2001)

Good vision depends on adequate intake of carotene
rich food.
Select the best option from the following statements.
(1) Vitamin A derivatives are formed from carotene.
(2) The photopigments are embedded in the
membrane discs of the inner segment.
(3) Retinal is a derivative of vitamin A.
(4) Retinal is a light absorbing part of all the visual
photopigments.
(a) (1), (3) and (4)

6) (b) (1) and (3)

(c) (2), (3) and (4)

(d) (1) and (2)
(NEET 2017)

Which one of the following statements is not
correct?
(a) Retinal is the light absorbing portion of visual
photopigments.
(b) In retina the rods have the photopigment
rhodopsin while cones have three different
photopigments.
(c) Retinal is a derivative of vitamin C.
(d) Rhodopsin is the purplish red protein present in
rods only. (2014)

In mammalian eye, the ‘fovea’ is the center of the
visual field, where
(a) only rods are present
(b) more rods than cones are found
(c) high density of cones occur, but has no rods
(d) the optic nerve leaves the eye. (2015)

Which of the following statements is correct?
(a) Cornea consists of dense matrix of collagen and
is the most sensitive portion of the eye.
(b) Cornea is an external, transparent and protective
proteinacious covering of the eye-ball.
(c) Cornea consists of dense connective tissue of
elastin and can repair itself.
(d) Cornea is convex, transparent layer which is
highly vascularised. (NEET 2019)

action of the autonomous nervous system?
(a) Swallowing of food
(b) Pupillary reflex
(c) Peristalsis of the intestine
(d) Knee-jerk response (2005)

Destruction of the anterior horn cells of the spinal
cord would result in loss of
(a) commissural impulses
(b) integrating impulses
(c) sensory impulses
(d) voluntary motor impulses. (2015)

Which part of the brain is responsible for
thermoregulation?
(a) Medulla oblongata (b) Cerebrum
(c) Hypothalamus (d) Corpus callosum
(NEET 2019)

When a neuron is in resting state i.e., not conducting
any impulse, the axonal membrane is
(a) comparatively more permeable to Na+ ions and
nearly impermeable to K+ ions
(b) equally permeable to both Na+ and K+ ions
(c) impermeable to both Na+ and K+ ions
(d) comparatively more permeable to K+ ions and
nearly impermeable to Na+ ions. (2011)

The most abundant intracellular cation is
(a) H+

14) (b) K+

(c) Na+

(d) Ca++.
(NEET 2013)

The most abundant intracellular cation is
(a) H+

15) (b) K+

(c) Na+

(d) Ca++.
(NEET 2013)

Receptor sites for neurotransmitters are present on
(a) pre-synaptic membrane
(b) tips of axons
(c) post-synaptic membrane
(d) membranes of synaptic vesicles. (NEET 2017)

Myelin sheath is produced by
(a) astrocytes and Schwann cells
(b) oligodendrocytes and osteoclasts
(c) osteoclasts and astrocytes
(d) Schwann cells and oligodendrocytes.
(NEET 2017)

Nissl’s bodies are mainly composed of
(a) proteins and lipids
(b) DNA and RNA
(c) nucleic acids and SER
(d) free ribosomes and RER. (NEET 2018)

Which cranial nerve has the highest number of
branches?
(a) Vagus nerve (b) Trigeminal nerve
(c) Facial nerve (d) None of these (1999)

Injury to vagus nerve in humans is not likely to
affect
(a) tongue movements
(b) gastrointestinal movements
(c) pancreatic secretion
(d) cardiac movements. (2004)

In a man, abducens nerve is injured. Which one of
the following functions will be affected?
(a) Movement of the eyeball
(b) Movement of the tongue
(c) Swallowing
(d) Movement of the neck (2005)