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Plant Growth and Development

Short Answer Type

91. What is antagonistic action in plants?

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Long Answer Type

92. Is growth measureable ? What are its parameters ?

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Short Answer Type

93. What is synergetic action of auxin and cytokinins ?

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94. Name the intrinsic and extrinsic factors that control growth ?

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Long Answer Type

95. Why is abscisic acid also known as stress hormone ?

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96. List five main groups of natural plant growth regulators. Write a note on physiological functions and agricultural/horticultural/application of any one of them.

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97. Define growth, differentiation, development, dedifferentiation, redifferentiation, determinate growth, meristem and growth rate.

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Short Answer Type

98. Why is not any one parameter good enough to demonstrate growth throughout the life of a flowering plant?

Different plant parts, tissues and cells grow at different rates in various stages of the life cycle of a plant. Moreover it is difficult to measure the increase in the protoplasm directly. Therefore, a number of parameters are taken into account to demonsstrate growth thrught out the life a flowering plants, so that a approximate growth rate.

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Long Answer Type

99. “Both a short day plant and a long day plant can produce flower simultaneously in a given place.” Explain.

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One Word Answers

100.

Which one of the plant growth regulators would you use if you are asked to :

(a) Induce rooting in a twig
(b) quickly ripen a fruit
(c) delay leaf senescence
(d) induce growth in axilliary buds
(e) ‘bolt’ a rosestte plant.
(f) induce immediate stomatal closure in leaves.

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