Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which one feature is common to leech, cockroach and scorpion

  • Nephridia

  • Cephalisation

  • Ventral nerve cord

  • Antenna


2.

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.


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3.

The total number of nitrogenous bases in human genome is estimated to be about

  • 3.5 million

  • 35 thousand

  • 35 million

  • 3.1 billion.


D.

3.1 billion.

Genome size is usually stated as the total number of base pairs; the human genome contains roughly 3 billion base pairs.


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4.

In which one of the following pairs the two items mean one and the same thing

  • Malleus - anvil

  • SA node - pacemaker

  • Leucocytes - lymphocytes

  • Haemophilia - blood cancer


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5.

Which one of the following categories of organisms do not evolve oxygen during photosynthesis

  • Red algae

  • Photosynthetic bacteria

  • C4 plants with Kranz anatomy

  • Blue green algae


6.

The bacteria Pseudomonas aeruginosa is useful because of its ability to

  • transfer genes from one plant to another

  • decompose a variety of organic compounds

  • fix atmospheric nitrogen in the soil

  • produce a wide variety of antibiotics


7.

Pruning of plants promotes branching because the axillary buds get sensitized to

  • ethylene

  • gibberellin

  • cytokinin

  • indole acetic acid.


8.

The sugarcane plant has

  • dumb-bell shaped guard cells

  • pentamerous flowers

  • reticulate venation

  • capsular fruits.


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9.

In Ulothrix meiosis takes place in

  • cells of the filament

  • holdfast

  • zygote

  • zoospores.


10.

In a plant organ which is covered by periderm and in which the stomata are absent, some gaseous exchange still takes place through

  • aerenchyma

  • trichornes

  • pneumatophores

  • lenticels.


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