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.
Under which of the following conditions would the rate of photosynthesis be MOST likely to decrease?
Increased light intensity
Elevated carbon dioxide levels
Temperature of 45°C
Increased water availability
If a plant is placed in an environment with very low carbon dioxide concentration, which aspect of photosynthesis would be MOST directly affected?
Light-dependent reactions
Water splitting
Carbon fixation in the Calvin cycle
Oxygen production
To synthesize one molecule of glucose via the Calvin cycle, how many molecules of ATP and NADPH are needed?
12 ATP and 18 NADPH
18 ATP and 12 NADPH
6 ATP and 6 NADPH
3 ATP and 2 NADPH
If a plant fixes 10 molecules of through the Calvin cycle, what is the total number of ATP and NADPH molecules consumed?
15 ATP and 10 NADPH
30 ATP and 20 NADPH
20 ATP and 30 NADPH
10 ATP and 10 NADPH
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.
Select the incorrect statement w.r.t. Photosystem II.
It is located in the thylakoid membrane.
Water is the ultimate electron donor.
Its reaction center chlorophyll a is P680.
It produces NADPH directly.
Select the incorrect one about photosystem I
Found in stroma lamellae
Involves in non cyclic photophosphorylation
Has chl a which shows maximum absorption at 700 nm
Is not involved in cyclic photophosphorylation
