(A) pointed structure formed by the modification of an entire leaf or a part of a leaf is called a spine.In $Opuntia$,the leaves are modified into spi

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(A) pointed structure formed by the modification of an entire leaf or a part of a leaf is called a spine.In $Opuntia$,the leaves are modified into spines to reduce the rate of transpiration and to protect the plant from herbivores.Therefore,the correct answer is $A$ (Leaf).