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 statements is INCORRECT concerning the energy release during ATP synthesis via chemiosmosis?
The proton gradient across the inner mitochondrial membrane drives ATP synthesis.
ATP synthase utilizes the energy stored in the proton gradient to phosphorylate ADP.
Oxygen acts as the final electron acceptor in the electron transport chain, contributing to the proton gradient.
ATP hydrolysis releases energy during chemiosmosis.
The enzyme directly responsible for synthesizing ATP during chemiosmosis is:
NADH dehydrogenase
Cytochrome oxidase
ATP synthase
ATPase
Which of the following BEST describes the relationship between the electron transport chain and ATP synthesis during chemiosmosis?
The electron transport chain creates a proton gradient that drives ATP synthesis
ATP synthesis provides the energy for the electron transport chain
The electron transport chain and ATP synthesis are independent processes
ATP synthase creates a proton gradient that drives the electron transport chain
What is the primary function of the bundle sheath cells surrounding the vascular bundles in plants?
Preventing photorespiration
Storage of water
Nitrogen fixation
Increasing light absorption
In plants, the high concentration of in the bundle sheath cells primarily serves to:
Increase ATP production during the Calvin cycle
Facilitate water storage within the leaf
Minimize photorespiration by suppressing RuBisCO's oxygenase activity
Enhance light absorption by the bundle sheath chloroplasts
Which of the following statements best describes the role of bundle sheath cells in the photosynthetic pathway?
They are primarily responsible for light absorption and energy capture.
They are the site of the Calvin cycle, where released from acids is used to synthesize sugars.
They contain numerous chloroplasts to increase light absorption and maximize photosynthesis.
They play a crucial role in nitrogen fixation, converting atmospheric nitrogen into usable forms for the plant.
The Kranz anatomy in plants facilitates the spatial separation of which two key processes?
Initial fixation and the Calvin cycle
Light absorption and the Calvin cycle
Water transport and sugar transport
Nitrogen fixation and sugar synthesis
If a plant's bundle sheath cells were damaged, which process would be most directly affected?
Initial fixation
Water transport
Light absorption
The Calvin cycle
The reaction center in PS II has an absorption maxima at:
700 nm
680 nm
480 nm
550 nm
P680, the reaction center chlorophyll a in photosystem II, absorbs light maximally at which wavelength?
700 nm
680 nm
450 nm
500 nm
