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 Multiple Choice QuestionsMultiple Choice Questions

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111.

Flowering dependent on cold treatment is

  • cryotherapy

  • cryogenics

  • cryoscopy

  • vernalisation


D.

vernalisation

Many plants have a vernalization requirement, that is, they actively repress flowering until after a period of prolonged cold, in order to align seed production with the favourable environmental conditions of spring. Vernalization occurs during the cold, but flowering only occurs many weeks or even months later when other specific conditions, including the presence of certain photoperiods and ambient temperatures, are also met.


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112.

A substance that induces dormancy of seed is

  • ABA

  • GA

  • thio-urea

  • cytokinin


113.

Which of the following is called stress hormone?

  • Abscisic acid

  • Auxin

  • Cytokinin

  • Gibberellic acid


114.

Vascular tissue in higher plants develop from which of the following

  • Procambium 

  • Protoderm

  • Periblem

  • Cortex


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115.

The discovery of gibberellins is related with one of the following

  • blast disease of rice

  • rust disease of wheat

  • bakane disease of rice

  • early blight disease of potato


116.

Cellular totipotency was first demonstrated by

  • F C Steward

  • Robert Hooke

  • T Schwann

  • A v Leeuwenhoek


117.

Choose the minor carp from the following

  • Cyprinus carpio

  • Anguilla sp

  • Labeo bata

  • cetanophyrngodon idella


118.

Name of a gaseous plant hormone is

  • IAA

  • gibberellin

  • ethylenes

  • abscisic acid


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119.

During seed germination its stored food is mobilised by

  • ethylene

  • cytokinin

  • ABA

  • gibberellin


120.

Which one of the following is a growth regulator produced by plants?

  • Naphthalene acetic acid

  • Zeatin

  • 2,4-dichlorophenoxy acetic acid

  • Benzyl aminopurine


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