CAM Plant Metabolism Temporal Separation

The video explains CAM metabolism, a process in CAM plants that separates CO2 intake and fixation by time. CAM plants, like cacti, thrive in deserts due to their efficient water use. At night, they open stomata to intake CO2, storing it as malate. During the day, stomata close to prevent water loss, and stored malate is used for carbon fixation. This temporal separation allows CAM plants to survive in extreme conditions.

What is the primary difference between CAM and C4 metabolism?

• C4 metabolism is more efficient in cold climates.

• CAM metabolism separates carbon fixation by time, while C4 separates by space.

• CAM metabolism occurs only in aquatic plants.

• CAM metabolism does not involve stomata.

Why are CAM plants well-suited for desert environments?

• They have a high rate of photosynthesis.

• They can open their stomata during the day.

• They require less sunlight than other plants.

• They efficiently conserve water by closing stomata during the day.

How do CAM plants prevent water loss during the day?

• By storing water in leaves.

• By opening their stomata.

• By increasing photosynthesis.

• By closing their stomata.

During the night, what happens to CO2 in CAM plants?

• It is converted into oxygen.

• It is used immediately in the Calvin cycle.

• It is fixed into malate and stored in vacuoles.

• It is released into the atmosphere.

What enzyme is involved in fixing CO2 into bicarbonate in CAM plants?

• ATP synthase

• Malic enzyme

• Rubisco

• Carbonic anhydrase

What is the role of malate in CAM plants during the day?

• It is used to absorb sunlight.

• It is stored for future use.

• It is converted into glucose.

• It is decarboxylated to release CO2 for the Calvin cycle.

What is the benefit of CAM plants not taking in oxygen during the day?

• It increases the rate of photosynthesis.

• It prevents photorespiration.

• It allows for more efficient water use.

• It enhances nutrient absorption.