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Plant Growth and Development

Multiple Choice Questions

61.

In callus culture, roots can be induced by the supply of

auxin
cytokinin
gibberelin
ethylene

62.

The bioassay of auxin is

avena curvature test
callus formation
culture of fungus
seed dormancy

63.

Induction of flowering by low temperature treatment is

vernalization
cryobiology
photoperiodism
prunning

64.

The bioassay of auxin is

avena curvature test
callus formation
culture of fungus
seed dormancy

65.

Which one of the following is a natural growth inhibitor?

66.

Apical dominance is caused by

auxin
gibberellin
kinetin
ABA

67.

Which of the following is not caused by deficiency of mineral?

Chlorosis
Etiolation
Shortening of internodes
Necrosis

68.
Which of the following plant is LDP?

Xanthium

Soybean

Wheat

Tobacco

Wheat

Long Day Plants (LDP) require a photoperiod of more than a critical length, ie, 4 to 18 hours. The best flowering of long day plants usually occurs in continuous light. For flowering, they require either no dark period or a very short dark period. Example of long day plants are wheat, maize, oats, spinach etc.