Which of the following is not naturally occurring
plant hormone ?
(a) 2 , 4-D (b) GA₂
(c) Gibberellin (d) IAA
Answers
The correct answer is a (2,4 D)
Explanation:
2,4 D denotes, " 2,4-dichlorophenoxyacetic acid". It belongs to a class of herbicides. It is not a natural hormone because it contains synthetic auxin. There are two type of hormones. Ones that naturally exist in human body and work as signaling mechanism. Other ones include these synthetic hormones that are made artificially. Most of them are harmful to human beings as well as environment.
Answer:
Plant hormones also called phytohormones are signal molecules that regulate plant development and growth.
Explanation:
Plant hormones are the plant growth regulators which are required in low concentration but are essential for the functioning of plants. Some of the important naturally occurring plant hormone include auxins or IAA (Indole Acetic Acid), gibberellins, abscisic acid, cytokinins, and ethylene.
2, 4 - Dichlorophenoxyacetic acid or 2, 4 - D is not a naturally occurring plant hormone because it is a systemic herbicide used to control growth of broadleaf weeds. 2, 4 - D is also a synthetic auxin which is used in laboratories for plant research.
Hence, the correct option is a. 2 , 4-D.
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