In what cell organelle does photosynthesis occur?

• A. Mitochondrion
• B. Nucleus
• C. Ribosome
• D. Chloroplast

Answer: (D)

Verified step by step guidance

1. Understand the process of photosynthesis: Photosynthesis is the process by which plants, algae, and some bacteria convert light energy into chemical energy stored in glucose. This process requires light, water, and carbon dioxide.
2. Identify the organelle responsible for photosynthesis: Photosynthesis occurs in the chloroplast, a specialized organelle found in plant cells and some protists. Chloroplasts contain the pigment chlorophyll, which captures light energy.
3. Compare the options provided: Mitochondrion is responsible for cellular respiration, not photosynthesis. The nucleus is the control center of the cell and does not perform photosynthesis. Ribosomes are involved in protein synthesis, not photosynthesis.
4. Focus on the correct organelle: Chloroplasts are the only organelle among the options that perform photosynthesis. They have a double membrane structure and contain thylakoids, where the light-dependent reactions occur, and the stroma, where the Calvin cycle takes place.
5. Conclude the reasoning: Based on the function and structure of the chloroplast, it is the correct answer for the organelle where photosynthesis occurs.