Question:
In Opuntia, the stem is modified into a flattened green structure to perform the function of leaves (i.e., photosynthesis). Cite two other examples of modifications of plant parts for photosynthesis.
Solution:
In Australian Acasia the petiole takes the shape of the leaf and turns green to perform the function of photosynthesis.
The stem, i.e., about one internode long modifies into a leaf-like structure to carry out photosynthesis, as in Asparagus.