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Which of the following are covered by a single membrane?
(a) Mitochondria
(b) Vacuole
(c) Lysosome
(d) Plastid
Correct Answer: (b) Vacuole and (c) Lysosome
Explanation:
Plant vacuoles contain water and metabolic waste in large quantities.Vacuoles are single membrane-bound cell organelle whose function in the plant cell is to maintain water balance and thereby help in managing cell size and turgor pressure.
Lysosomes are cell organelles found only in animal cells and were discovered by the Belgian cytologist Christian de Duve in 1949.
Lysosomes are filled with digestive enzymes capable of breaking the organic material.
Lysosomes attach to the foreign materials entering the cell and destroy them with the help of digestive enzymes. Similarly, lysosomes also act on the old or damaged cells.
As lysosomes help in removing the cell debris, they are also known as the suicidal bags of a cell, or cellular housekeepers, or scavengers, or demolition squads.
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