Assertion :Auxins were the first growth hormones discovered in plants. Reason: In most of plant tip movements in seedling stages led to the discovery of auxins.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Auxins are a class of plant hormones with some morphogen-like characteristics. Auxins and their role in plant growth were first described by the Dutch Scientist Frits Warmolt Went. Kenneth V.Thimann isolated this phytohormone. In 1881, Charles Darwin and his son Francis performed experiments on coleoptiles, the sheaths enclosing young leaves in germinating grass seedlings. The experiment exposed the coleoptile to light from a unidirectional source and observed that they bend towards the light.

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(a) Both assertion and reason are correct and the reason is correct explanation of assertion
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(c) Assertion is correct, but reason is incorrect
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