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Plant Growth and Development

Multiple Choice Questions

171.

Apical dominance is caused by

auxin
gibberellin
kinetin
ABA

172.

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

Chlorosis
Etiolation
Shortening of internodes
Necrosis

173.

Which of the following plant is LDP?

Xanthium
Soybean
Wheat
Tobacco

174.

In which one pair both the plants can be vegetatively propagated by leaf pieces?

Bryophyllum and Kalanchoe
Chrysanthemum and Agave
Agave and Kalanchoe
Asparagus and Bryophyllum

175.

Gibberellin was first extracted from

Gibberella fujikuro
algae
bacteria
roots of higher plants

176.

Auxin in plant means for

cell elongation
fruit ripening
cell division
inhibit the root growth

177.

Pencils are prepared from the wood of

Pinus vinaster
Juniperus virginiana
Chamaecyparis piscifera
Abies pindrow

178.
Ageing is retarded by

ABA

CKN

GA

C₂H₄

CKN

Cytokinins are a class of plant growth substances (phytohormones) that promote cell division or cytokinesis, in plant roots and shoots. They are also involved in cell growth and differentiation but also affect apical dominance, axillary bud growth and leaf senescence.

Eg, degradation of protein and chlorophyll was delayed in the detached leaves of Xanthium, if cytokinin was used in a medium.