Final answer:
Photosynthesis in cacti occurs in the stem, as cacti have adapted their stems to carry out this process due to their usually arid habitats. Their leaves are modified into spines and do not perform photosynthesis. Cacti uses a specialized form of photosynthesis known as CAM to conserve water. The correct option is 1) The stem
Step-by-step explanation:
In cacti, photosynthesis primarily occurs in the stem. Unlike many plants that have leaves to perform photosynthesis, cacti have adapted to arid environments by evolving their stems to take on this crucial role. The leaves are modified into spines, which are not involved in photosynthesis.
The stems of cacti are green and contain the necessary chlorophyll for photosynthesis, which involves capturing sunlight to convert carbon dioxide and water into glucose and oxygen. The process of photosynthesis in cacti is similar to other plants in that it occurs in cells containing chloroplasts. However, cacti have a specialized form of photosynthesis known as Crassulacean Acid Metabolism (CAM), which allows them to minimize water loss by opening their stomata at night instead of during the day. The correct option is 1) The stem