______ is called the powerhouse of the cell.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Mitochondria
Mitochondria are called the powerhouse of the cell because cellular respiration takes place in them: food (glucose) is broken down with oxygen, and the energy released is stored as ATP, the energy currency the cell uses for its work.
Why the other options are incorrect
Option (1) Cell wall/membrane — Incorrect. It is the cell’s outer boundary, which controls what enters and leaves the cell.
Option (2) Protoplasm — Incorrect. It is the whole living content of the cell (cytoplasm and nucleus), not one organelle.
Option (4) Endoplasmic Reticulum — Incorrect. It is a network of membranes that makes and carries proteins and lipids within the cell.