31. Which of the following is an example of negative feedback loop in humans?
A
Secretion of tears after falling of sand particles into the eye
B
Salivation of mouth at the sight of delicious food
C
Secretion of sweat glands and constriction of skin blood vessels when it is too hot
D
Constriction of skin blood vessels and contraction of skeletal muscles when it is too cold
Answer :
Constriction of skin blood vessels and contraction of skeletal muscles when it is too cold
32. Which of the following regions of the brain is incorrectly paired with its function?
A
Cerebellum - language comprehension
B
Corpus callosum - communication between the left and right cerebral cortices
C
Cerebrum - calculation and contemplation
D
Medulla oblongata - homeostatic control
Answer :
Cerebellum - language comprehension
33. For the synthesis of rhodopsin, which of the following food is needed
A
Mango
B
Rice
C
Carrot
D
Tomatoes
Answer :
Carrot
34.
A sagittal section of human-brain is shown here. Identify at least two labels from $$A - D.$$
A
$$A$$ - Cerebral hemispheres; $$B$$ - Cerebellum
B
$$C$$ - Mid brain; $$D$$ - Cerebellum
C
$$A$$ - Cerebrum; $$C$$ - Pons
D
$$B$$ - Corpus callosum; $$D$$ - Medulla
Answer :
$$A$$ - Cerebrum; $$C$$ - Pons
35. When a neuron is in resting state i.e., not conducting any impulse, the axonal membrane is:
A
comparatively more permeable to $$N{a^ + }$$ ions and nearly impermeable to $${K^ + }$$ ions
B
equally permeable to both $$N{a^ + }$$ and $${K^ + }$$ ions
C
impermeable to both $$N{a^ + }$$ and $${K^ + }$$ ions
D
comparatively more permeable to $${K^ + }$$ ions and nearly impermeable to $$N{a^ + }$$ ions
Answer :
comparatively more permeable to $${K^ + }$$ ions and nearly impermeable to $$N{a^ + }$$ ions
36. "Telescopic vision" found in
A
Amphibians
B
Mammals
C
Birds
D
None of the above
Answer :
Birds
37. In which animal nerve cell is present but brain is absent?
A
Sponge
B
Earthworm
C
Cockroach
D
Hydra
Answer :
Hydra
38. Which of the following is stirrup shaped ear ossicle
A
Incus
B
Stapes
C
Malleus
D
Humerus
Answer :
Stapes
39. Characteristic feature of human cornea
A
Secreted by conjunctiva and glandular
B
It is lacrimal gland which secretes tears
C
Blood circulation is absent in cornea
D
In old age it becomes harden and white layer deposits on it which causes cataract
Answer :
Blood circulation is absent in cornea
40. Otolith (otoconic) are CaCO3 particles found in
A
Periymph
B
Endolymph
C
Bones
D
Vitreous humor
Answer :
Endolymph