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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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