Comparing C3, C4, and CAM Photosynthesis

What is the primary function of the Calvin cycle in photosynthesis?

• To release carbon dioxide

• To fix carbon dioxide into organic molecules

• To convert light energy into chemical energy

• To produce oxygen

Which enzyme is responsible for carbon fixation in the Calvin cycle?

• NADP Glyceraldehyde Phosphate Reductase

• Rubisco

• ATP synthase

• PEP carboxylase

Why do C3 plants typically undergo photorespiration under hot conditions?

• None of the above

• Both A and B

• Stomata close, reducing CO2 intake

• Rubisco has a higher affinity for oxygen

What unique feature do C4 plants have to avoid photorespiration?

• None of the above

• Nighttime carbon fixation

• Separation of carbon fixation and Calvin cycle into different cells

• Higher water storage in leaves

Which type of plants perform carbon fixation at night to minimize water loss?

• Both B and C

• CAM plants

• C4 plants

• C3 plants

What is 'kranz' anatomy in the context of C4 plants?

• A flower arrangement

• A leaf structure with cells arranged in a wreath-like pattern

• A type of root structure

• A stem modification

How does the leaf structure of CAM plants help them survive in desert conditions?

• By having larger stomata

• By storing water in aquiferous parenchyma

• By increasing leaf thickness

• By reducing the number of chloroplasts

What is the main benefit of adding CO2 to a greenhouse?

• It enhances flower color

• It reduces plant diseases

• It boosts photosynthesis rates

• It increases humidity

At what CO2 concentration does the rate of photosynthesis start to plateau?

• 340 ppm

• 800-900 ppm

• 1000 ppm

• 1200 ppm

Which enzyme is highly sensitive to temperature changes and affects the Calvin cycle?

• NADP Glyceraldehyde Phosphate Reductase

• Rubisco

• PEP carboxylase

• ATP synthase