Which organelle converts light energy into glucose during photosynthesis and contains chlorophyll?

• A. Chloroplast
• B. Endoplasmic Reticulum
• C. Golgi Apparatus
• D. Mitochondria

Answer: (A)

Photosynthesis happens in chloroplasts, the plant cell organelles that contain chlorophyll, the pigment that captures light. The light energy absorbed by chlorophyll drives the series of reactions inside the chloroplasts that build glucose from carbon dioxide and water. In the chloroplast, light energy fuels the light-dependent reactions to make energy carriers (ATP and NADPH), and then the Calvin cycle uses those carriers to fix CO2 into sugars like glucose. Because chloroplasts are the site where light energy is captured and used to synthesize glucose, they are the organelles responsible for this process. Other organelles, like the Endoplasmic reticulum and Golgi apparatus, are involved in protein and lipid processing and trafficking, not photosynthesis. Mitochondria handle cellular respiration and energy production from glucose, not the initial capture of light energy to form glucose.