Leaves are modified to form a special structure to give support to the plant. Name that modification.
Leaf: It is a flat green structure that is present all throughout a plant and is a very important part of the plant because it prepares the food.
In Opuntia, the stem is modified into a flattened green structure to perform the functions of leaves, (i.e., photosynthesis). Cite some other examples of modifications of plant parts for the purpose of photosynthesis.