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Gibberellin

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Question

The characteristics like expansion, breaking dormancy, promoting germination and flowering are associated with

A

Auxins

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B

Gibberellins

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C

Cytokinins

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D

Ethylene

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Solution

The correct option is B Gibberellins
Gibberellin is a plant hormone that is involved in various physiological processes of plants. It acts as plant growth regulator. It is involved in various processes like stem elongation, germination, flowering and leaf senescence. It breaks the seed dormancy and promotes germination. Flowering requires either long day or cold temperature. However, gibberellin induces flowering under normal condition.
Thus, the correct answer is option B.

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Q. and break seed dormancy and promote germination.

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. Which of the following promotes seed germination and inhibits dormancy?

Q. Which of the following statements regarding ethylene is/are correct?
I. Ethylene influences the growth of seeds and seedlings.
II. It helps in breaking the dormancy of seeds.
III. It promotes the formation of apical hook in dicots, germination and horizontal growth of seedlings.

Q. Match the terms to these definitions.
Abscission, apical dominance, biological dock, circadian rhythm, vernalization, dormancy, ethylene, germination, gibberellin, geotropism, photoperiodism, senescence
.......... Plant hormone producing increased stem growth; also involved in flowering and seed germination.

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