Question

Choose the correct answer from the alternatives given.
Which of the following statements is not true about $C_3$ and $C_4$ plants?

• A. $C_3$ plants are more successful in mild climates than $C_4$ plants
• B. $C_4$ plants contain chloroplasts only in part of their mesophyll cells
• C. $C_3$ plants fix $C{O}_2$ in the mesophyll cells
• D. $C_3$ plants make glucose in the bundle sheath cells

Answer 1

The correct option is D $C_3$ plants make glucose in the bundle sheath cells

C3 plants make glucose by Calvin cycle that operates only in the mesophyll cells while in C4 plants, photosynthesis takes place in a chloroplast of a thin-walled mesophyll cell and a 4-carbon acid is handed off to a thick-walled bundle sheath cell where the Calvin cycle occurs in a chloroplast of that second cell. This makes C4 plants escape photo-respiration (as photo-respiration is not beneficial for photosynthesis). C4 plants exist in harsh climates and thrive on long growing seasons with lots of access to sunlight.

So, the correct option is, 'C3 plants make glucose in the bundle sheath cells'.