Which statement is true? (1 point)
A. • The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the stroma.
B. O The Calvin cycle is the light-dependent (needs light) step of photosynthesis and happens in the thylakoid membrane.
C. The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the thylakoid membrane.
D. • The Calvin cycle is the light-dependent (needs light) step of photosynthesis and happens in the stroma.
A. The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the stroma.
The correct statement is:
A. The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the stroma.
To determine which statement is true, we need to know about the Calvin cycle and its location in photosynthesis. The Calvin cycle is the second step of photosynthesis and is responsible for converting carbon dioxide into glucose. It is a light-independent process, meaning it does not directly require light. The Calvin cycle occurs in the stroma, which is the fluid-filled space inside the chloroplasts.
With this information, we can eliminate options B and C since they incorrectly state that the Calvin cycle is light-dependent or occurs in the thylakoid membrane.
Therefore, the correct statement is A: The Calvin cycle is the light-independent step of photosynthesis and happens in the stroma.
The original energy for photosynthesis to begin comes from: (1 point)
A. • carbon dioxide molecules
B. ATP
C. Light
D. Water molecules