In eukaryotic cells,cellular respiration takes place in the

Step 1: Analyze the question The question asks where cellular respiration takes place in eukaryotic cells. Eukaryotes have membrane-bound organelles, and one of them is specialized for energy release.

Step 2: Explain the concept Cellular respiration is the process by which cells break down glucose to release energy in the form of ATP. Aerobic respiration has three main stages:

• Glycolysis takes place in the cytoplasm. It breaks glucose into pyruvate.
• Krebs cycle (citric acid cycle) takes place in the mitochondrial matrix.
• Electron transport chain takes place on the inner mitochondrial membrane (the cristae). This stage produces most of the ATP.

Most of the respiration process, and nearly all of the ATP production, happens in the mitochondrion. That is why it is called the "powerhouse of the cell."

Step 3: Evaluate the options

• A. Nucleus: It contains DNA and controls cell activities. It is not a site of respiration.
• B. Cytoplasm: Glycolysis happens here, but this is only the first stage. It is not where respiration as a whole takes place. It is also the main site in prokaryotes, which have no mitochondria.
• C. Centrioles: They help in cell division by forming spindle fibres. They have nothing to do with respiration.
• D. Mitochondrion: It hosts the Krebs cycle and the electron transport chain, so it is the main site of cellular respiration in eukaryotes. ✔

Step 4: Answer The correct option is D. mitochondrion.

Tip: Remember "Mitochondrion = Make energy (ATP)." If a JAMB question mentions eukaryotes and respiration, think mitochondrion. Option B (cytoplasm) is a common distractor because glycolysis happens there, but the question is about the main site of respiration.