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 Multiple Choice QuestionsMultiple Choice Questions

71.

Auxin in plant means for

  • cell elongation

  • fruit ripening

  • cell division

  • inhibit the root growth


72.

Pencils are prepared from the wood of

  • Pinus vinaster

  • Juniperus virginiana

  • Chamaecyparis piscifera

  • Abies pindrow


73.

Ageing is retarded by

  • ABA

  • CKN

  • GA

  • C2H4


74.

Agricultural chemicals include

  • growth regulators

  • fertilizers

  • pesticides

  • all of these


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75.

The dormancy of seed is regulated by

  • ABA

  • Ethylene

  • GA- 3

  • Dihydrozeatin


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76.

Which of the following is a day neutral plant

  • Helianthus annuus

  • Euphorbia pulcherrima

  • Avena sativa

  • Beta vulgaris


A.

Helianthus annuus

Day neutral plants do not need a specific photoperiod to produce flowers. They are also called intermediates or photoneutrals. Their photoperiod varies from a few hours to 24 hours of uninterrupted light e.g. tomato, cucumber, sunflower, Helianthus annuus, maize and cotton etc.


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77.

Which of the following is an antigibberellin

  • Auxin

  • Ethylene

  • ABA

  • Cytokinin


78.

Identify the incorrect statement about ABA growth regulator

  • It increases the tolerance of plants against different stresses.

  • It acts as general plant growth inhibitor and inhibitor of metabolism.

  • It helps in seed maturation and dormancy.

  • It promotes morphogenesis and differentiation of shoots.


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79.

2,4- D is an effective

  • fungicide

  • weedicide

  • rodenticide

  • wormicide


80.

Assertion: Secondary metabolites are produced in small quantities and their extraction from the plant is difficult and expensive.

Reason: Secondary metabolites can be commercially produced by using tissue culture technique.

  • 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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