Question

Give reason leaf is modified into thorn where water availability is low

Answer 1

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In plants like Gloriosa superba, The leaf tips get elongated and become tendrils. In some plants like Lathyrus aphaca, the entire leaf gets modified into a tendril and the stipules expand to carry out the function of a leaf

Answer 2

Answer:

leaf is modified into thorn where water availability is low because leaf needs sunlight for photosynthesis and where water is available there is lees light