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 Multiple Choice QuestionsMultiple Choice Questions

131.

Phototropic curvature in Avena coleoptile is the result of uneven distribution of

  • auxin

  • starch

  • gibberellins

  • phytochrome


132.

Study of bakanae disease of rice led to discovery of

  • auxins

  • bakery rice

  • Both (a) and (b)

  • gibberellins


133.

Equipment used for the measurement of growth in plants is known as

  • respirometer

  • auxanometer

  • atmometer

  • potometer


134.

The pH of protolasm is

  • 6.0

  • 6.8

  • 7.8

  • 8.2


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135.

The hormone, which prevents abscission is

  • IBA

  • ABA

  • NAA

  • Cytokinin


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136.

When an ovary develops into a fruit without fertilization it is called

  • porogamy

  • apospory

  • apogamy

  • parthenocarpy


D.

parthenocarpy

Parthenocarpicfruits are seedless and develop from ovary without fertilization.

Porogamy is the fertilization of a seed plant involving passage of the pollen tube into the ovule by the micropyle.

Apospory is the development of 2n gametophytes, without meiosis and spores, from vegetative, or non- reproductive, cells of the sporophyte.

Apogamy is the development of 1n sporophytes without gametes and syngamy from vegetative cells of the gametophyte.


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137.

GA usually promotes

  • sterility in flowers

  • maleness in flowers

  • femaleness in flowers

  • Both (b) and (c)


138.

Ethylene is

  • gaseous hormone

  • largest hormone

  • liquid hormone

  • solid hormone


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139.

Induction of cell division and delay in senescence is done by

  • cytokinins

  • auxins

  • GA

  • Co-A


140.

Which of the following induces and promotes cell division?

  • ABA

  • Auxin

  • Cytokinin

  • Gibberellin


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