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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.

Q. Which of the following phytohormone does not occur naturally in plants?

Q. Which of the following phytohormones promote plant growth?

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