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Ethylene

Horizontal gr...

Question

Horizontal growth of seedlings, swelling of axis and apical hook formation in dicot seedlings is brought about by

A

Auxins

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B

Gibberellins

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C

Ethylene

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D

Kinetin

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E

Abscisic acid

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Solution

The correct option is A Ethylene
Ethylene is a gaseous plant hormone. It is also called as ripening hormone as it stimulates ripening of fruits. It also promotes the horizontal growth of seedlings, swelling of the axis and increase curvature by apical hook formation in dicot seedlings. It inhibits stem elongation. This is called as triple response shown by ethylene.
Thus, the correct answer is option C.

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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.
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