What part if opuntia is modified to form spines?

Dear student
Opuntia is the xerophytic plant and is found in deserts with low water availability. Leaves of this plant are modified into spine to prevent the water loss through transpiration. These spine shaped leaves do not carry out photosynthesis. Opuntia also have green fleshy stem which serve the function of water storage and photosynthesis. 
Regards.

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It is actually the leaf which gets modified to spines. It offers defence and protection to the plant part. Opuntia & Cactus are examples of Leaf Spine Modification of Leaves .
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