NEET Biology Solved Question Paper 2011

Multiple Choice Questions

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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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    Sympathetic nervous system induces

    • Heartbeat

    • Secretion of digestive juice

    • Secretion of saliva

    • All of the above

    Answer

    The canal system is a characteristic feature of

    • Echinoderms

    • Helminths

    • Coelenterates

    • Sponges

    Answer

    Carbon monoxide is a pollutant because it

    • Reacts with oxygen

    • Inhibits glycolysis

    • Reacts with haemoglobin

    • Makes nervous system inactive

    Answer

    The contraction of gall bladder is due to

    • Gastrin

    • Secretin

    • Cholecystokinin

    • Enterogastrone

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

    • Osmosis

    • Simple diffusion

    • Passive transport

    • Active transport

    Answer

    A condition of failure of kidney to form urine is called

    • Deamination

    • Entropy

    • Anuria

    • None of these

    Answer

    The functional unit of the contractile system in striated muscle is

    • Cross Bridge

    • Myofibril

    • Myofibril

    • Z-band

    Answer

    The layer of cells that secrete enamel of the tooth is

    • Dentoblast

    • Ameloblast

    • Osteoblast

    • Odontoblast

    Answer
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    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

    Answer