Let's analyze the options one by one to determine which equation shows how a plant cell stores energy in an energy carrier molecule.
### Option A:
[tex]\[ \text{NADP}^{+} + P \rightarrow \text{ATP} \][/tex]
- NADP[tex]\(^{+}\)[/tex] is Nicotinamide adenine dinucleotide phosphate, a coenzyme that functions as a carrier molecule.
- P (Phosphate) alone cannot convert NADP[tex]\(^{+}\)[/tex] to ATP.
- NADP[tex]\(^{+}\)[/tex] is not directly converted to ATP in photosynthesis.
### Option B:
[tex]\[ \text{ATP} + \text{NADPH} \rightarrow \text{ADP} \][/tex]
- This reaction actually depicts the consumption of energy, as ATP (Adenosine triphosphate) and NADPH are used to form ADP (Adenosine diphosphate).
- This indicates an energy-releasing process, not an energy-storing one.
### Option C:
[tex]\[ \text{NADP}^{+} + H^{+} \rightarrow \text{NADPH} \][/tex]
- NADP[tex]\(^{+}\)[/tex] (Nicotinamide adenine dinucleotide phosphate) is reduced to NADPH (Nicotinamide adenine dinucleotide phosphate hydrogen).
- This reduction involves the gain of electrons and a hydrogen ion (H[tex]\(^{+}\)[/tex]), storing energy in the form of NADPH.
- NADPH is an energy carrier molecule that stores energy needed for the Calvin cycle in photosynthesis.
### Option D:
[tex]\[ \text{ADP} + H^{+} \rightarrow \text{ATP} \][/tex]
- While this reaction represents ATP synthesis (an energy-storing process), it involves ADP and phosphate group moving towards ATP.
- The presence of [tex]\(H^{+}\)[/tex] alone does not describe the complete synthesis of ATP.
Given our detailed examination of the reactions:
- Option C ([tex]\(\text{NADP}^{+} + H^{+} \rightarrow \text{NADPH}\)[/tex]) correctly describes one way a plant cell stores energy in an energy carrier molecule.
So, the correct equation is:
[tex]\[ \text{NADP}^{+} + H^{+} \rightarrow \text{NADPH} \][/tex]
Thus, the answer is option C.
