Thorn is a modified branch because ________.

It is hard, straight and pointed.

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It is a part of the plant.

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It arises in the axil of a leaf.

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It is a defensive organ.

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Solution

The correct option is C It arises in the axil of a leaf.
Thorn is a modified branch because it arises from the bud present in the axil of leaves that is meant to develop in a branch. It is a defensive modification as it is hard, straight, and pointed and so it prevents grazing by herbivores.
Hence, the correct answer is option C.

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