145. What are gas vacuoles'?
(a) Pseudovacuoles
(b) Characteristic feature of certain cells
(c) Take part in buoyancy regulation
(d) All of the above
Answers
Answer:
Gas vacuoles are aggregates of hollow cylindrical structures called gas vesicles. They are located inside some bacteria. The inflation and deflation of the vesicles provides buoyancy, allowing the bacterium to float at a desired depth in the water.
Answer:
Ans (a) Pseudo vacuoles
Explanation:
(a) Pseudo vacuole: Such vacuoles, filled with metabolic gases, are found in some prokaryotes and help them in floating. ... The sap vacuole is filled with a liquid called cell sap and surrounded by a vacuolar membrane of tonoplast.
(b) Characteristic feature of certain cells: They have been reported only in prokaryotes. An air vacuole is not a single entity, neither it is surrounded by a common membrane. It consists of a number of smaller sub-microscopic vesicles. Each vesicle is surrounded by a protein membrane and encloses metabolic gases.
(c) Take part in buoyancy regulation: If a fish is neutrally buoyant at a given depth and descends in the water column, the increase in pressure decreases the volume of the gas bladder, making the fish negatively buoyant and the fish begins to sink.
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