Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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11.

Wharton's duct is the duct of

  • submandibular salivary gland

  • parotid gland

  • sublingual gland

  • all of these


A.

submandibular salivary gland

Wharton's duct is the duct of submandibular salivary gland that opens into the floor of mouth at the junction where front of the tongue meets the mouth's floor.


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12.

An artificial pacemaker is implanted subcutaneously and connected to the heart in patients

  • having 90% blockage of the three main coronary arteries

  • having a very high blood pressure

  • with irregularity in the heart rhythm

  • suffering from arteriosclerosis


13.

Which part of the nephron is impermeable to water

  • Proximal convoluted tubule

  • Distal convoluted tubule

  • Ascending limb of loop of Henle

  • Descending limb of loop of Henle


14.

Pacinian corpuscles occur in the skin of certain parts of body in mammals. These are

  • type of glands

  • pain receptors

  • naked tactile receptors

  • encapsulated pressure receptors.


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15.

The checkpoint in cell cycle plays important role in

  • repairing DNA damage

  • apoptosis initiation

  • assessing DNA damage

  • none of these


16.

Achondroplasia is a disease related with the defect in the formation of

  • membrane

  • cartilage

  • mucosa

  • none of these


17.

Pick the correct group consisting of all genera exhibiting homospory

  • Lycopodium, Psilotum, Selaginella, Equisetum

  • Equisetum, Pteris, Salvinia, Psilotum

  • Salvinia, Pteris, Lycopodium, Selaginella

  • Equisetum, Psilotum, Lycopodium, Pteris


18.

C4 plants have better productivity because

  • C4 plants absorb more light

  • C4 plants absorb more CO2

  • C4 plants lack photorespiration

  • all of these


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19.

Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that

  • nerve fibre is insulated by a medullary sheath

  • sodium pump starts operating only at the cyton and then continues into the nerve fibre

  • neurotransmitters are released by dendrites and not by axon endings

  • neurotransmitters are released by the axon endings and not by dendrites.


20.

Assertion: Photorespiration is a wasteful process where there is no synthesis of ATP energy.

Reason: RuBisCO is present in mesophyll cells of C4 plants hence they show more productivity.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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