Rubisco and Photosynthesis Efficiency Quiz

What is the primary function of the enzyme Rubisco in photosynthesis?

• To absorb sunlight

• To catalyse the fixation of carbon dioxide in the Calvin cycle

• To transport water through the plant

• To break down glucose

Which type of plant is most susceptible to photorespiration?

• C3 plants

• C4 plants

• CAM plants

• Aquatic plants

What is photorespiration?

• The process of producing ATP from sunlight

• The uptake of oxygen and release of carbon dioxide by Rubisco

• The storage of glucose in roots

• The movement of water through xylem

Which adaptation helps C4 plants reduce photorespiration?

• Opening stomata at night

• Storing water in leaves

• Using only sunlight for energy

CAM plants are best adapted to which type of environment?

• Cold and wet

• Hot and dry

• Temperate and humid

• Aquatic

How do CAM plants minimise water loss during photosynthesis?

• By closing stomata during the day and opening them at night

• By increasing leaf surface area

• By storing water in roots

• By using more Rubisco

What is the main difference between C3 and C4 photosynthetic pathways?

• C3 plants use more sunlight

• C4 plants do not use Rubisco

Which of the following is a disadvantage of photorespiration in C3 plants?

• It increases glucose production

• It decreases the efficiency of photosynthesis

• It increases water uptake

• It enhances oxygen production

In which cell type does the Calvin cycle occur in C4 plants?

• Mesophyll cells

• Bundle sheath cells

• Guard cells

• Epidermal cells

Which of the following best describes the adaptation of C3 plants to their environment?

• They are adapted to cool, moist environments with moderate sunlight

• They are adapted to hot, dry environments

• They are adapted to saline environments

• They are adapted to aquatic environments