Name the plant hormones which are responsible for the following effects :
(a) falling of leaves
(b) opening of stomata
(c) bending of stem towards light
(d) closing of stomata

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Solution

(a) Abscisic acid
(b) Cytokinins
(c) Auxins
(d) Abscisic acid

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Question 35
Name the plant hormones responsible for the following

(a) Elongation of cells
(b) Growth of stem
(c) Promotion of cell division
(d) Falling of senescent leaves

Q. Which of the following hormones is responsible for the bending of plants towards the light?

The breathing and respiration in woody stem of a plant takes place through :
(a) root hair
(b) lenticels
(c) closed stomata
(d) open stomata

Q. Which of the following is not caused by a growth movement?
(a) bending of the shoot of a plant in response to light
(b) closing up of leaves of a sensitive plant on touching with an object
(c) climbing up of a plant on an object by using tendrils
(d) movement of the root of a plant towards a source of water

Q. Which of the following statement is correct regarding opening and closing of stomata?
(i) stomata opens when guard cells are turgid.
(ii) stomata closes when guard cells are turgid.
(iii) stomata opens when guard cells are flaccid.
(iv) stomata closes when guard cells are flaccid.

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Name the plant hormones which are responsible for the following effects : (a) falling of leaves (b) opening of stomata (c) bending of stem towards light (d) closing of stomata

(a) Abscisic acid (b) Cytokinins (c) Auxins (d) Abscisic acid

Name the plant hormones which are responsible for the following effects :
(a) falling of leaves
(b) opening of stomata
(c) bending of stem towards light
(d) closing of stomata

(a) Abscisic acid
(b) Cytokinins
(c) Auxins
(d) Abscisic acid