Question 63

Glucose is produced in the Calvin cycle during photosynthesis.

The Calvin cycle is responsible for converting carbon dioxide into glucose, which serves as an essential energy source for plants. This process utilizes the ATP and NADPH generated during the light-dependent reactions to synthesize sugars.

A) ATP

ATP is produced during the light-dependent reactions of photosynthesis, not in the Calvin cycle itself. While ATP is crucial for the Calvin cycle, it is not the end product of this stage; thus, this option is incorrect.

B) Glucose

Glucose is the primary product of the Calvin cycle, formed when carbon dioxide is fixed and converted into sugar using the energy supplied by ATP and NADPH. This makes option B the correct answer.

C) Water

Water is not produced in the Calvin cycle; instead, it is consumed during photosynthesis, particularly during the light-dependent reactions where it is split to release oxygen and provide electrons. Therefore, this option is incorrect.

D) Oxygen

Oxygen is produced during the light-dependent reactions when water molecules are split; it is not a product of the Calvin cycle. As such, this option does not answer the question correctly.

Conclusion

Glucose is definitively the correct answer as it is the main product of the Calvin cycle, reflecting the cycle's role in synthesizing sugars from carbon dioxide. Other options, such as ATP, water, and oxygen, pertain to different stages of photosynthesis and do not accurately represent the outcome of the Calvin cycle.