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Role of Abscisic Acid

Which of the ...

Question

Which of the following hormones and their respective functions are incorrectly matched?

A

Auxins --> Helps in growth of root and shoot apex.

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B

Gibberellins --> Helps in improving the shape of fruits

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C

Ethylene --> Promotes rapid internode elongation in deep water rice plants.

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D

Abscisic acid --> delays leaf senescence

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Solution

The correct option is D Abscisic acid --> delays leaf senescence
Abscisic acid is a plant growth inhibitor that promotes leaf senescence while cytokinin is a plant growth promoter that delays leaf senescence.
Senescence is a process of ageing in plants.
Auxins are plant growth promoters that helps in growth of root and shoot apex.
Gibberellins are plant growth promoters that helps in improving the shape of fruits e.g apple.
Ethylene is a plant growth regulator that promotes rapid internode elongation in deep water rice plants.

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Similar questions

Q. Choose the right from the following.
(i) In light, hormone auxin, helps the cells to grow longer in plants.
(ii) Plant hormone gibberellins help in growth of a stem.
(iii) Cytokinin inhibits cell division.
(iv) Abscisic acid promotes growth in plants.

Q. Read the given statements and identify the plant hormones X, Y and Z.
(i) Hormone Y suppresses flowering in mango and also promotes rapid internode/petiole elongation in deep water rice plants and hence helping leaves or upper part of shoot to remain above water.
(ii) Hormone X promotes root growth and root hair formation.
(ii) Hormone Z inhibits the seed germination, increases the tolerance of plant to various stresses, play important role in seed development maturation and dormancy.

Q. The hormone that promotes rapid elongation of intermodes or leaf base in deep water rice plant is

Q. Match the following hormones with their functions.

Hormones	Function
1.Ethylene	i. Helps in cell division.
2.Gibberellin	ii. Induces dormancy in buds and seeds
3.Cytokinin	iii. Helps in the ripening of fruit
4.Abscisic acid	iv. Causes bolting in plants

Q. Study the following statements.
I. X hormone promotes cell elongation and helps in the increase in the length of the plant.
II. Y hormone induces flowering in mango and also promotes rapid internode/petiole elongation in deep plants and hence helping leaves or upper parts of shoot above water.
III. Z hormone inhibits the seed germination, increase the tolerance of plant to various stresses, play important role in seed development, maturation and dormancy.
Identify the correct names of hormones marked as X, Y and Z.

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Role of Abscisic Acid

Standard XII Biology

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