Which part of desert plants such as cactus performs the process of photosynthesis?

Correct option is B

In desert plants such as cactus performs the process of photosynthesis occurs in the stem.
· The modified leaves of cactus plants have transformed into spines.
· The green stem of the cactus, equipped with chlorophyll, assumes the roles typically associated with leaves, including photosynthesis
· Consequently, the stem serves as the primary site of photosynthesis in cactus plants instead of the leaves.