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A C4 plant and a CAM plant are grown under identical environmental conditions. Which statement BEST describes their relative water use efficiency (WUE) and photosynthetic rates under prolonged high light intensity and high temperature?
The C4 plant will have both higher WUE and a higher photosynthetic rate than the CAM plant.
The CAM plant will have higher WUE than the C4 plant, but the C4 plant will have a higher photosynthetic rate.
The C4 plant will have higher WUE than the CAM plant, but the CAM plant will have a higher photosynthetic rate.
The CAM plant will have both higher WUE and a higher photosynthetic rate than the C4 plant.
Which of the following is NOT a characteristic of C4 plants?
High CO2 compensation point
Kranz anatomy
Presence of PEP carboxylase
Dimorphic chloroplasts
The primary distinction between and plants lies in their:
initial product of fixation
ability to grow in hot and dry climates
utilization of light energy
requirement for water
Given below are two statements:
Statement I: In plants, increased levels can lead to decreased fixation due to competition with RuBisCO.
Statement II: In plants, photorespiration is significantly reduced in mesophyll cells and nearly absent in bundle sheath cells.
In the light of the above statements, choose the correct answer from the options given below:
Both Statement I and Statement II are correct
Both Statement I and Statement II are incorrect
Statement I is correct but Statement II is incorrect
Statement I is incorrect but Statement II is correct
How does the presence of affect fixation in plants, and how do plants mitigate this effect?
competes with for RuBisCO in plants, reducing fixation. plants concentrate around RuBisCO in bundle sheath cells, minimizing this competition.
enhances fixation in plants. plants have no mechanism to regulate levels.
has no effect on fixation in plants. plants use PEP carboxylase to fix .
inhibits release in plants. plants store excess in mesophyll cells.
Which of the following statements accurately describes the role of bundle sheath cells in minimizing photorespiration in plants?
They maintain a high concentration around RuBisCO, minimizing its interaction with .
They actively transport out of the leaf.
They prevent from entering the leaf.
They convert into .
If a plant is exposed to high levels and shows a significant decrease in fixation, is it more likely to be a or plant? Explain your reasoning.
plant, because they are more susceptible to photorespiration at high levels.
plant, because they have a higher affinity for .
plant, because they cannot fix in the presence of .
plant, because they require high levels for efficient fixation.
PEP carboxylase
I. is involved in atleast some fixation in both and plants
II. Catalyses the reaction of fixing into pyruvic acid in bundle sheath cells
III. is capable of fixing more efficiently at lower atmospheric concentration than RuBP carboxylase
Select the correct option
I only
I and III
II and III
I, II and III
PEP carboxylase
I. is involved in atleast some fixation in both and plants
II. Catalyses the reaction of fixing into pyruvic acid in bundle sheath cells
III. is capable of fixing more efficiently at lower atmospheric concentration than RuBP carboxylase
Select the correct option
I and II
I and III
II and III
I, II and III
I. It is the characteristic of plants II. It is the characteristic of -plants III. It occurs in chloroplast IV. It occurs in day time V. It occurs in night Select the correct options in relation to photorespiration Correct option Incorrect option
I, IV II, III, IV
II, III, IV I, V
I, II, III IV, V
IV, V I, II, III
