NEET Botany Photosynthesis in Higher Plants Dark Phase MCQs

A scientist isolates chloroplasts and provides them with $^{14}CO_2$ in the dark. After a brief period, the $^{14}C$ is found predominantly in:

If a plant is exposed to $^{14}CO_2$ in the dark and then transferred to light, the $^{14}C$ label will appear first in which of the following carbohydrates?

Which enzyme in the Calvin cycle is directly responsible for incorporating CO2 into an organic molecule?

The regeneration phase of the Calvin cycle requires ATP. What is the primary role of ATP in this phase?

A mutation in a plant affects the enzyme responsible for converting glyceraldehyde-3-phosphate (G3P) to dihydroxyacetone phosphate (DHAP). Which of the following is the MOST likely direct consequence of this mutation on the Calvin cycle?

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?

Which of the following is NOT directly involved in the regeneration of RuBP during the dark phase of photosynthesis?

The primary function of the dark phase of photosynthesis is to:

How many molecules of CO2 are required to produce one molecule of glucose (C6H12O6) in the Calvin cycle?

The first stable product formed after CO2 fixation in the C3 cycle is: