Multiple Choice Questions

Advertisement

Study of bakanae disease of rice led to discovery of

  • auxins

  • bakery rice

  • Both (a) and (b)

  • gibberellins


D.

gibberellins

In Japan, 'bakanae disease' or 'foolish seedling disease' in rice was known. It was found that there is some connection between bakanae disease and fungus Gibberella fujikuroi or Fusarium moniliformae. The active substance present in fungus was separated and named gibberellin by Yabuta.


Advertisement

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

  • auxin

  • starch

  • gibberellins

  • phytochrome


The pH of protolasm is

  • 6.0

  • 6.8

  • 7.8

  • 8.2


GA usually promotes

  • sterility in flowers

  • maleness in flowers

  • femaleness in flowers

  • Both (b) and (c)


Induction of cell division and delay in senescence is done by

  • cytokinins

  • auxins

  • GA

  • Co-A


Advertisement

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

  • respirometer

  • auxanometer

  • atmometer

  • potometer


The hormone, which prevents abscission is

  • IBA

  • ABA

  • NAA

  • Cytokinin


Which of the following induces and promotes cell division?

  • ABA

  • Auxin

  • Cytokinin

  • Gibberellin


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

  • porogamy

  • apospory

  • apogamy

  • parthenocarpy


Advertisement
<

Ethylene is

  • gaseous hormone

  • largest hormone

  • liquid hormone

  • solid hormone


Advertisement