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During water stress and drought conditio...

During water stress and drought conditions……...causes stomatal closure.

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Abscisic acid
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_________ induces stomatal closure

Assertion (A): ABA plays an important role in plants during water stress. Reason (R): ABA promotes stomatal closing during water stress.

How ABA involves in stomatal closure.

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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 axillary buds (e) ‘Bolt’ a rosette plant (f) Induce immediate stomatal closure in leaves.

Assertion: Adrenal medullary hormones help in combating the stress condition. Reason: Both adrenaline and noradrenaline act on same organs and produce similar effects.

Assertion: During unfavourable conditiions, the fresh water sponges disintegrate, but the gemmule can withstand adverse conditions. Reason: Gemmules are hard balls consisting of an internal mass of food laden archaeocytes.

Fill in the blanks: (i) _____causes stomatal closure. (ii) The growth and functions of thyroid gland is controlled by_____.