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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

Etiolation

Etiolation is a process in flowering plants when grown in partial or complete absence of light. Symptoms include- pale yellow or white colour due to lack of chlorophyll, long internodes, small and rudimentary leaves, poor development of lignified tissue.

Chlorosis is the yellowing of leaves due to lack of chlorophyll. It occurs due to lack of Manganese (Mn), Zinc (Zn) or Iron (Fe) deficiency.

Shortening of internodes ocuurs in rosette plants such as lettuce. It occurs due to deficinecy of Zinc (Zn).

Necrosis in plants is a disease in which tissues of the plants starts degenerating. It causes leaves, stem and other parts of the plants to darken and wilt. It is caused by the deficiency of Nitrogen (N), Potassium (K), Magnesium (Mg), Sulphur (S), Iron (Fe), Manganese (Mn), Zinc (Zn) and Molybdenum (Mo).