231. Only rood are present in the eyes of one of the following animals

A Pigeon
B Squirrel
C Fowl
D Owl
Answer :   Owl
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232. Which pigment helps some notural animal to see at night

A Haemoglobin
B Porphyrin
C Guanin
D Heparin
Answer :   Guanin
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233. Vitreous humor is

A Colloid
B Watery fluid
C Mucoid connective tissue
D All of the above
Answer :   All of the above
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234. Anesthetics reduce pain by blocking the transmission of nerve impulses. The kind of chemicals working as anesthetics are those that block

A only the voltage-gated sodium channels in membranes
B only the voltage-gated potassium channels in membranes
C only the neuro-transmitter receptors
D voltage-gated sodium and potassium channels and neuro-transmitter receptors
Answer :   voltage-gated sodium and potassium channels and neuro-transmitter receptors
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235. One of the examples of the action of the autonomous nervous system is

A swallowing of food
B pupillary reflex
C peristalsis of the intestine
D knee-jerk response
Answer :   peristalsis of the intestine
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236. Space between cornea & lens is

A Aqueous chamber
B Viterous chamber
C Fovea centralis
D Canal of sclemm
Answer :   Aqueous chamber
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