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Role of Ethylene

Which of the ...

Question

Which of the following is not an effect of ethylene?

A

Promotes senescence and abscission of plant organs

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B

Breaks seed and bud dormancy

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C

Brings about horizontal growth of seedlings

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D

Hastens fruit ripening

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E

Helps to overcome apical dominance

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Solution

The correct option is E
Helps to overcome apical dominance

Ethylene is a simple gaseous plant growth regulator synthesized from amino acid methionine. It is also known as ripening hormone because it promotes the senescent changes in the plant and helps in breaking seed and bud dormancy, bring about the horizontal growth of seedlings. But it does not help in overcoming apical dominance.

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Similar questions

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 statements is /are correct about cytokinin?.
Statement 1: Cytokinin is a hormone whose main function is the induction of cell division and delay in senescence
Statement 2: Cytokinin is the process of cell division
Statement 3: Cytokinin helps in breaking seed dormancy.
Statement 4: Cytokinin helps to overcome apical dominance.

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. Ethylene causes apical hook formation in dicot seedlings, promotes senescence and abscission of plant leaves and flowers.

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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Role of Ethylene

Standard XII Biology

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