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Role of Auxin

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Question

Which one of the following is incorrect with reference to ethylene?

A

Breaks seed and bud dormancy

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B

Promotes rapid internode/petiole elongation in rice

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C

Promote root growth and root hair formation and increases transpiring surface.

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D

Causes synchronous senescence of leaves in tobacco

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Solution

The correct option is C
Promote root growth and root hair formation and increases transpiring surface.

Ethylene promotes root growth and root hair formation, thus helping the plants to increase their absorption surface

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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. How many following statements are correct for ethylene ?

1) Ethylene breaks the seed and bud dormancy
2) Ethylene promotes rapid petiole elongation in deep water rise plant
3) Ethylene promotes root growth and root hair formation
4) Ethylene promotes female flowers in cucumbers

Q. Read the given statements to identify the phytohormone that performs these functions.

(i) Horizontal growth of seedlings, swelling of the axis and apical hook formation in dicot seedlings.
(ii) Promoting senescence and abscission of leaves and flowers.
(iii) Breaking seed and bud dormancy.
(iv) Initiating germination in peanut seeds.
(v) Sprouting of potato tubers.

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.

Which of the following growth regulators break dormancy in seeds and buds?

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