Photosynthesis is a highly complex process that occurs in plants and photosynthetic bacteria. The site of photosynthesis is the chloroplast, shown below. Photosynthesis is divided into two main parts: the light-dependent reactions and the light-independent reactions (the Calvin Cycle).Chloroplast Diagram by Kelvin Ma (CC BY 3.0)Which of the following statements BEST describes the interactions between the light-independent and light-dependent reactions?Elimination ToolSelect one answerAThe light-dependent and light-independent reactions do not interact.BThe light-dependent and light-independent reactions produce the same products at different times.CThe light-dependent reactions rely on the light-independent reactions for ATP and NADPH.DThe light-independent reactions rely on the light-dependent reactions for ATP and NADPH.
Question
Photosynthesis is a highly complex process that occurs in plants and photosynthetic bacteria. The site of photosynthesis is the chloroplast, shown below. Photosynthesis is divided into two main parts: the light-dependent reactions and the light-independent reactions (the Calvin Cycle).Chloroplast Diagram by Kelvin Ma (CC BY 3.0)Which of the following statements BEST describes the interactions between the light-independent and light-dependent reactions?Elimination ToolSelect one answerAThe light-dependent and light-independent reactions do not interact.BThe light-dependent and light-independent reactions produce the same products at different times.CThe light-dependent reactions rely on the light-independent reactions for ATP and NADPH.DThe light-independent reactions rely on the light-dependent reactions for ATP and NADPH.
Solution
The correct answer is D. The light-independent reactions rely on the light-dependent reactions for ATP and NADPH.
Here's why:
In the process of photosynthesis, the light-dependent reactions occur first. These reactions take place in the thylakoid membrane of the chloroplasts where light energy is converted into chemical energy in the form of ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate).
The ATP and NADPH produced in the light-dependent reactions are then used in the light-independent reactions, also known as the Calvin Cycle. These reactions occur in the stroma of the chloroplasts. Here, the ATP and NADPH are used to convert carbon dioxide into glucose, a type of sugar that the plant can use for energy.
Therefore, the light-independent reactions are dependent on the light-dependent reactions for the ATP and NADPH they need to produce glucose.
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