Which one of the following statements about 'vacuoles' is not correct?
- (a)In plants, there is a large central vacuole that may occupy 90% of total cell volume.
- (b)In plant cells, vacuoles provide turgidity and rigidity.
- (c)In Amoeba, vacuoles have role in nutrition.
- (d)Vacuoles are absent in animal cells.
Correct — D, 'Vacuoles are absent in animal cells.' This statement is not correct — animal cells do have vacuoles, though they are small and numerous rather than one large central one. Because the question asks which statement is wrong, D is the answer.
- (a)In plants, there is a large central vacuole that may occupy 90% of total cell volume. — This is a correct statement — a mature plant cell's central vacuole can indeed fill up to about 90% of the cell — so it is not the wrong one.
- (b)In plant cells, vacuoles provide turgidity and rigidity. — This is correct: a water-filled vacuole exerts turgor pressure that keeps plant cells firm, so it is not the false statement.
- (c)In Amoeba, vacuoles have role in nutrition. — This is correct — Amoeba uses food vacuoles for digestion (and contractile vacuoles for water balance) — so it is a true statement, not the exception.
Vacuoles are membrane-bound, fluid-filled organelles. Plant cells typically have one large central vacuole, bounded by a membrane called the tonoplast, that maintains turgor and stores substances. Animal cells also contain vacuoles, but they are smaller and more numerous — so vacuoles are not absent from animal cells.
The question asks for the incorrect statement. Three options state well-known true facts about vacuoles; the false one claims animal cells lack vacuoles, which is wrong because animal cells possess small vacuoles.
- Plant cells usually have a single large central vacuole occupying most of the cell volume.
- Turgor pressure from the vacuole gives plant cells rigidity and support.
- Animal cells contain vacuoles too, but small and numerous — they are not absent.
- In Amoeba, food vacuoles aid digestion and contractile vacuoles expel excess water.
Animal cells do have vacuoles — small ones — so the claim that they are absent is the incorrect statement.
- Assuming animal cells have no vacuoles at all.
- Overlooking that the question asks for the incorrect statement.
An 'odd-one-out / which statement is not correct' test on facts about vacuoles.
No directly related past PYQ was found.
- practice — not a real PYQ
The membrane surrounding the plant cell's central vacuole is called the
- (a)tonoplast
- (b)plasmalemma
- (c)cell wall
- (d)cristae
Answer(a) tonoplast — the membrane bounding the vacuole.
- practice — not a real PYQ
In Amoeba, excess water is expelled by the
- (a)food vacuole
- (b)contractile vacuole
- (c)central vacuole
- (d)chloroplast
Answer(b) contractile vacuole — it regulates the cell's water balance.