“Both a short day plant and a long day plant can produce flo

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 Multiple Choice QuestionsShort Answer Type

91. What is antagonistic action in plants?
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92.  Is growth measureable ? What are its parameters ?
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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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 Multiple Choice QuestionsLong 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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 Multiple Choice QuestionsShort Answer Type

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

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


The flowering in plants is in response to duration period of light or relative length of light. The long day plants need a longer duration of light whereas the short day plants need short duration of light. 

If the long day plant and the short day plants gets the required duration of the light necessary for their flowering they may produce flower simultaneosly in a given plave. If the long day plants is planted before the short day one such that the long day plants gets a longer duration of light , both the short day plant and a long day plant can produce flower simultaneously in a given place

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 Multiple Choice QuestionsOne 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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