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Auxin

Which among t...

Question

Which among the following statements regarding phytohormones is true?

A

They are produced only by the plant cells

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B

All plant growth regulators promote differentiation

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C

Auxins were first isolated from plants

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D

Kinetin does not occur naturally in plants

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Solution

The correct option is D Kinetin does not occur naturally in plants
Cytokinins have specific effects on cytokinesis, and were discovered as kinetin (a modified form of adenine, a purine) from the autoclaved herring sperm DNA. Kinetin does not occur naturally in plants

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Q. Phytohormones are chemicals that regulate plant growth. They are signal molecules produced within the plant, and occur in extremely low concentrations. Which of the following are not phytohormones?

Q. Assertion: Phytohormones are the plant compounds that can promote and inhibit the plant growth.
Reason: There are some phytohormones like auxin, cytokinins which play a role in plant growth and some phytohormones like abscisic acid which inhibit the plant growth.

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