Photosynthesis takes place in which cell organelle?
A) Endoplasmic reticulum
B) Nucleus
C) Mitochondrion
D) Chloroplast
E) Ribosome
IMAT 2026 · Question 25
Q25 - Photosynthesis
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The correct answer is D) Chloroplast.
Chloroplasts contain chlorophyll in their thylakoid membranes, where light energy is captured (light-dependent reactions). The enzymes of the Calvin cycle, which fix CO₂ into sugars, are in the stroma.
A) Incorrect: The endoplasmic reticulum synthesises proteins (rough ER) and lipids (smooth ER).
B) Incorrect: The nucleus stores DNA and is where transcription happens.
C) Incorrect: The mitochondrion carries out cellular respiration, which roughly reverses photosynthesis.
D) Correct: Photosynthesis takes place in chloroplasts.
E) Incorrect: Ribosomes synthesise proteins.
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