Identify the incorrect statements –

Correct option is C

The correct answer is (C) CAM plants do not use C₃ plants pathway in the day

Explanation:
• CAM (Crassulacean Acid Metabolism) plants actually utilize both pathways, but they separate them in time (temporal separation).
• During the night, CAM plants open their stomata and fix $CO_2$ using the C4 pathway (PEP carboxylase), storing it as malic acid in vacuoles.
• During the day, the stomata close to conserve water. The stored malic acid is then decarboxylated to release $CO_2$ internally.
• This released $CO_2$ is then fixed via the standard C3 pathway (Calvin cycle) using the enzyme Rubisco.
• Therefore, statement C is incorrect because CAM plants definitely use the C3 pathway during the day to complete photosynthesis.

Information Booster:
• CAM photosynthesis is an adaptation to arid conditions (e.g., cacti, pineapples, orchids). It allows plants to keep stomata closed during the heat of the day.

Additional Knowledge:
• CAM plants (Option A): Named after the Crassulaceae family where this metabolism was first discovered.
• C4 pathway at night (Option B): This is the mechanism where $CO_2$ is fixed into 4-carbon organic acids when temperatures are cooler.
• C3 plants (Option D): The majority of plants on Earth are C3 plants, including wheat, rice, and soybeans. They are most efficient in cool, moist climates.