Which statement is true?(1 point) Responses The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the stroma. The Calvin cycle is the light-independent (does not need 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 stroma. The Calvin cycle is the light-dependent (needs light) step of photosynthesis and happens in the stroma. The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the thylakoid membrane. The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the thylakoid membrane. The Calvin cycle is the light-dependent (needs light) step of photosynthesis and happens in the thylakoid membrane. The Calvin cycle is the light-dependent (needs light) step of photosynthesis and happens in the thylakoid membrane.
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 "The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the stroma" is true.
The question asks which statement is true regarding the Calvin cycle, specifically in terms of whether it is light-dependent (needs light) or light-independent (does not need light) and where it occurs, either in the stroma or in the thylakoid membrane.
To determine the correct statement, we need to recall some basic knowledge about photosynthesis.
First, photosynthesis is the process by which plants, algae, and some bacteria convert light energy into chemical energy in the form of glucose. It consists of two main stages: the light-dependent reactions and the light-independent reactions (also known as the Calvin cycle).
The light-dependent reactions occur in the thylakoid membrane of the chloroplasts. These reactions capture and convert light energy into chemical energy in the form of ATP and NADPH. During this stage, water is split, releasing oxygen as a byproduct.
The Calvin cycle, on the other hand, is the light-independent reactions and occurs in the stroma of the chloroplasts. In this stage, ATP and NADPH from the light-dependent reactions are used to convert carbon dioxide into glucose through a series of enzyme-controlled reactions. This process does not directly rely on light.
Now, let's evaluate the given statements:
1. The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the stroma.
2. The Calvin cycle is the light-dependent (needs light) step of photosynthesis and happens in the stroma.
3. The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the thylakoid membrane.
4. The Calvin cycle is the light-dependent (needs light) step of photosynthesis and happens in the thylakoid membrane.
Based on our understanding of photosynthesis and the Calvin cycle, we can conclude that statement 1 is the true statement. The Calvin cycle is the light-independent (does not need light) step of photosynthesis, and it occurs in the stroma of the chloroplasts.