Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The layer of cells that secrete enamel of the tooth is

  • Dentoblast

  • Ameloblast

  • Osteoblast

  • Odontoblast


2.

The exchange of gases in the alveoli of the lungs takes place by

  • Osmosis

  • Simple diffusion

  • Passive transport

  • Active transport


3.

Carbon monoxide is a pollutant because it

  • Reacts with oxygen

  • Inhibits glycolysis

  • Reacts with haemoglobin

  • Makes nervous system inactive


4.

Calcitonin is a thyroid hormone which

  • Elevates potassium level in the blood

  • Lowers calcium level in a blood

  • Elevates calcium level in the blood

  • Has no effect on calcium


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5.

A condition of failure of kidney to form urine is called

  • Deamination

  • Entropy

  • Anuria

  • None of these


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6.

Solenocytes are the main excretory structures in

  • Annelids

  • Molluscs

  • Echinodermates

  • Platyhelminthes


D.

Platyhelminthes

Solenocytes (also called flame cells) are meant for excretion and osmoregulation in Platyhelminthes. Annelids have metanephridia for excretion, Molluscs have kidneys (although different from vertebrate kidneys) for excretion. In echinodermates, no special excretory organs are found for excretion. In them, excretion takes place through diffusion or osmosis or through active transport.


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7.

The functional unit of the contractile system in striated muscle is

  • Cross Bridge

  • Myofibril

  • Myofibril

  • Z-band


8.

The contraction of gall bladder is due to

  • Gastrin

  • Secretin

  • Cholecystokinin

  • Enterogastrone


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9.

Sympathetic nervous system induces

  • Heartbeat

  • Secretion of digestive juice

  • Secretion of saliva

  • All of the above


10.

The canal system is a characteristic feature of

  • Echinoderms

  • Helminths

  • Coelenterates

  • Sponges


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