Prepare for NEET Biology Photosynthesis in Higher Plants with MCQs & PYQs on NEET.GUIDE. Get free practice, previous year questions, and expert guidance to grasp light and dark reactions.
Which of the following combinations of factors would MOST SIGNIFICANTLY limit the rate of photosynthesis in a typical C3 plant?
Low light intensity, high CO2 concentration, and optimal temperature
High light intensity, low O2 concentration, and high humidity
High temperature, low CO2 concentration, and water stress
Low temperature, high CO2 concentration, and waterlogged soil
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.
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.
Identify the enzyme which catalyses the first step of photorespiration in . plants.
PEP carboxylase
RuBisCO
NADP reductase
Hexokinase
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
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
Rubisco enzyme is absent in
Mesophyll cells
Bundle sheath cells
Malignant melanoma cells
Guard cells
