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.
RuBisCo's oxygenase activity leads to the formation of 2-phosphoglycolate, a __-carbon compound.
Two
Three
Four
Five
If RuBisCo's oxygenase activity is inhibited in a plant, which of the following processes would be directly affected?
Calvin cycle
Light-dependent reactions
Krebs cycle
Photorespiration
A crop plant exhibits reduced photorespiration, enhanced water use efficiency, high photosynthetic rates at elevated temperatures, and improved nitrogen utilization. Which photosynthetic pathway is this plant MOST likely using?
C3
C4
CAM
Both C3 and C4
Compared to C3 plants, a plant with significantly lower photorespiration rates at high temperatures is likely to have:
Lower photosynthetic efficiency
Higher photosynthetic efficiency
Similar photosynthetic efficiency
No photosynthesis at high temperatures
A researcher observes a plant exhibiting high photosynthetic rates even under high light intensity and temperature conditions. Which of the following is the LEAST likely explanation for this observation?
The plant utilizes a C4 photosynthetic pathway.
The plant exhibits low photorespiration rates.
The plant has an extensive root system.
The plant effectively manages water loss.
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.
Identify the enzyme which catalyses the first step of photorespiration in . plants.
PEP carboxylase
RuBisCO
NADP reductase
Hexokinase
