Which one of the following generally acts as an antagonist to gib

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 Multiple Choice QuestionsMultiple Choice Questions

31.

Pneumatophores occur in

  • Halophytes

  • Free-floating hydrophytes

  • Submerged hydrophytes

  • Carnivorous plants


32.

Plants having little or no secondary growth are

  • Grasses

  • Deciduous angiosperms

  • Cycads

  • Conifers


33.

Sweet potato is a modified

  • Stem

  • Adventitious root

  • Rhizome

  • Tap root


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34.

Which one of the following generally acts as an antagonist to gibberellins?

  • Zeatin

  • Ethylene

  • ABA

  • IAA


C.

ABA

Gibberellins and abscisic Acid (ABA) are antagonistic to each other. Gibberellins promote seed germination whereas ABA promotes seed dormancy.


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35.

Phellogen and phellem respectively denote

  • Cork and cork cambium

  • Cork cambium and cork

  • Secondary cortex and cork

  • Cork and secondary cortex


36.

Which one correctly describe reproduction and life cycle of fern?

  • Spore → Gamete → Prothallus → Sporophyte

  • Gamete → Spore → Prothallus → Plant

  • Prothallus → Sporophyte → Gamete → Fern

  • Sporangia → Spore → Prothallus → Sporophyte → Plant


37.

Which of the following is not an auxin?

  • IM

  • IBA

  • Zeatin

  • NM


38.

Which of the following properties is shown by cytokinins?

  • Delay leaf senescence

  • Cause leaf abscission

  • Promote seed dormancy

  • Promote stornatal closing


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39.

Genetic dwarfism can be overcome by

  • Gibberellin

  • Ethylene

  • Auxin

  • ABA


40.

Hormone inducing fruit ripening is

  • Cytokinin

  • Ethylene

  • Aabscissic acid

  • Gibberellic acid


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