QUESTION 12 In some plants, Rubisco is sparated from oxygen to prevent side-reac

Question

QUESTION 12

In some plants, Rubisco is sparated from oxygen to prevent side-reactions from occurring. How does this occur in CAM plants?

Rubisco operates in different cells than those that take in oxygen.

Rubisco operates at a different time than oxygen entry into the cell.

Both (A) and (B) are true.

Neither (A) nor (B) are true

Rubisco operates in different cells than those that take in oxygen.

Rubisco operates at a different time than oxygen entry into the cell.

Both (A) and (B) are true.

Neither (A) nor (B) are true

Explanation / Answer

The correct answer is 1.

Reason: The fixation process occurs in the mesophill cells of the leaf tissue so that they will be more exposed to air and this will help in CO2 intake, while malate which is formed by this fixation is transported deeper in the tissue to metabolise, thus avoiding contact with O2, and so photo respiration is prevented.

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