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  4. Leaves become modified into spines in:

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Q. Leaves become modified into spines in:

NTA AbhyasNTA Abhyas 2020

Solution:

Opuntia leaves get modified into spines to protect them from grazing animals, also reduce area of transpiration.
Pea leaves are modified into tendrils.
Onion leaves become fleshy since food is stored in it.
Silk cotton get modified from unifoliate leaves to multifoliate leaves.