Pruning of plants promotes branching because the axillary buds ge

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.


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.


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


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7.

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

  • ethylene

  • gibberellin

  • cytokinin

  • indole acetic acid.


D.

indole acetic acid.

“It has been known since the 1930s that the plant hormone auxin is released by the plant’s actively growing tip and is transported down the main stem where it has an indirect effect on buds to inhibit branching. There are a number of ways in which the hormone exerts this effect and we have discovered a new path by which it works.”

The research suggests that for a shoot tip to be active, it must be able to export auxin into the main stem. But if substantial amounts of auxin already exist in the main stem, export from an additional shoot tip cannot be established


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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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