Which statement is true
The Calvin cycle is light dependent( needs light) step of photosynthesis and happens in the stroma
the calvin cycle is the light dependent (needs light) step of photosynthesis and happens in the thylakoid membrane
the Calvin cycle is the light independent (does not need to light) step of photosynthesis and happens in the thylakoid membrane
the Calvin cycle is the light independence (does not need light) step of photosynthesis and happens in the stroma
The statement "the Calvin cycle is the light independent (does not need light) step of photosynthesis and happens in the stroma" is true.
The statement that is true is: "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 understand the Calvin cycle and where it occurs in photosynthesis.
The Calvin cycle is a series of chemical reactions that occur in the stroma of chloroplasts during photosynthesis. It is the light-independent (does not need light) step of photosynthesis because it does not directly require light energy. Instead, it utilizes the products of the light-dependent reactions (which occur in the thylakoid membrane) to convert carbon dioxide into glucose.
Now let's evaluate the statements:
Statement 1: "The Calvin cycle is light dependent (needs light) step of photosynthesis and happens in the stroma."
This statement is incorrect because the Calvin cycle is light-independent and does not require light. However, the second part of the statement is correct as the Calvin cycle does occur in the stroma.
Statement 2: "The Calvin cycle is the light-dependent (needs light) step of photosynthesis and happens in the thylakoid membrane."
This statement is incorrect. The Calvin cycle is not light-dependent and does not occur in the thylakoid membrane.
Statement 3: "The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the thylakoid membrane."
This statement is incorrect. While the Calvin cycle is light-independent, it does not occur in the thylakoid membrane. Therefore, this statement is false.
Statement 4: "The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the stroma."
This statement is true. The Calvin cycle is the light-independent step of photosynthesis and indeed occurs in the stroma.
Therefore, the correct statement is: "The Calvin cycle is the light-independent step of photosynthesis and happens in the stroma."