Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
A plant exhibiting Kranz anatomy experiences a sudden drop in atmospheric CO2 levels. Which of the following is the MOST LIKELY immediate consequence on its photosynthetic efficiency?
Reduced initial fixation of CO2 by PEP carboxylase in mesophyll cells.
Increased oxygenation of RuBisCO in bundle sheath cells.
Immediate cessation of the Calvin cycle in bundle sheath cells.
Enhanced activity of photorespiration in mesophyll cells.
In a dicot leaf exhibiting Kranz anatomy, the mesophyll cells uniquely possess:
Larger chloroplasts with well-developed grana and reduced stroma lamellae.
Smaller chloroplasts with rudimentary grana and abundant stroma lamellae.
Chloroplasts similar in size and structure to bundle sheath chloroplasts.
Chloroplasts lacking both grana and stroma lamellae.
Which of the following metabolites is transported from mesophyll cells to bundle sheath cells in C4 plants during active photosynthesis?
3-Phosphoglycerate (3-PGA)
Glyceraldehyde 3-phosphate (G3P)
Pyruvate
Malate or aspartate
Under conditions of high temperature and light intensity, why do C4 plants show higher photosynthetic rates compared to C3 plants?
C4 plants have a higher affinity for CO2 than C3 plants.
C4 plants open their stomata more frequently than C3 plants.
C4 plants can utilize a wider range of light wavelengths compared to C3 plants.
Spatial separation of initial CO2 fixation and the Calvin cycle minimizes photorespiration.
In C4 plants, the initial fixation of CO2 occurs in mesophyll cells, forming a 4-carbon compound. This compound then travels to bundle sheath cells, where it releases CO2. What is the PRIMARY advantage of this spatial separation of CO2 fixation and the Calvin cycle?
Increases the efficiency of light absorption
Minimizes photorespiration by increasing CO2 concentration around RuBisCO
Reduces the need for water
Allows the plant to fix CO2 at night
The primary benefit of the C4 pathway is:
Minimizing photorespiration
Increasing water use efficiency
Enhancing light absorption
Reducing the need for RuBisCO
Which type of plants primarily utilize the C4 pathway?
Plants in hot, dry environments
Plants in cool, shaded environments
Aquatic plants
All plants
The first stable product of the C4 pathway is:
Oxaloacetate (OAA)
Pyruvate
3-phosphoglycerate (3-PGA)
Ribulose-1,5-bisphosphate (RuBP)
Which enzyme is responsible for the initial carboxylation in C4 plants?
PEP carboxylase
RuBisCO
Kinase
Dehydrogenase
In which cell type does the Calvin cycle occur in C4 plants?
Bundle sheath cells
Mesophyll cells
Epidermal cells
Guard cells
