Which statement about photosynthesis and respiration is true?

Which statement about photosynthesis and respiration is true?

• A. Photosynthesis occurs in mitochondria; respiration occurs in chloroplasts.
• B. Photosynthesis occurs in chloroplasts; respiration occurs in mitochondria.
• C. Photosynthesis occurs in nucleus; respiration occurs in ribosomes.
• D. Photosynthesis occurs in lysosomes; respiration occurs in peroxisomes.

Answer: (B)

The main idea is where these energy-related processes happen inside the cell. Photosynthesis takes place in chloroplasts because these organelles house the chlorophyll pigment and the machinery for capturing light and converting it into chemical energy, with light reactions in the thylakoid membranes and the Calvin cycle in the stroma. Cellular respiration mainly happens in mitochondria, where the cell breaks down sugars to produce ATP through glycolysis in the cytosol, followed by the Krebs cycle and the electron transport chain in the mitochondrial matrix and inner membrane. Other organelles listed aren’t where these energy processes occur. So the true statement is that photosynthesis occurs in chloroplasts and respiration occurs in mitochondria.

The main idea is where these energy-related processes happen inside the cell. Photosynthesis takes place in chloroplasts because these organelles house the chlorophyll pigment and the machinery for capturing light and converting it into chemical energy, with light reactions in the thylakoid membranes and the Calvin cycle in the stroma. Cellular respiration mainly happens in mitochondria, where the cell breaks down sugars to produce ATP through glycolysis in the cytosol, followed by the Krebs cycle and the electron transport chain in the mitochondrial matrix and inner membrane. Other organelles listed aren’t where these energy processes occur. So the true statement is that photosynthesis occurs in chloroplasts and respiration occurs in mitochondria.