Which of the following statements about dark reactions is correct?

Options

A. They occur in darkness.
B. They are not light dependent.
C. They are dependent upon the products syntesised during light reactions.
D. All of these

Explanation

To determine which statement about dark reactions is correct, we can analyze each option provided:

1. **They occur in darkness.**
- This statement is incorrect. Dark reactions, also known as the Calvin cycle, do not necessarily occur in the absence of light. They can take place in the presence of light as well.

2. **They are not light dependent.**
- This statement is also incorrect. While dark reactions do not require light directly, they are dependent on the products (ATP and NADPH) generated during the light reactions. Therefore, they are indirectly light-dependent.

3. **They are dependent upon the product synthesized during light reactions.**
- This statement is correct. Dark reactions utilize ATP and NADPH produced in the light reactions to convert carbon dioxide into glucose.

4. **All of these.**
- This statement is incorrect because the first two statements are false.

Based on the analysis, the correct answer is:

**The third statement: "They are dependent upon the product synthesized during light reactions."**