Which of the following are covered by a single membrane?
(a) Mitochondria
(b) Vacuole
(c) Lysosome
(d) Plastid
Lysosomes are the single membraned sac-like structures present in the cytoplasm that carry digestive enzymes and help in food digestion. These are known as suicide bags of cells as they dispose of the digestive enzymes in extreme starvation cases and kill the cell.
Plastids are double membraned organelle
Mitochondria is a double membrane organelle where pyruvate molecule is turned into ATP on the surface of the membranes.
Therefore, option (c) is correct.