question_answer 33)

  Which out of the following is not a function of vacuole? (a) Storage                                                                          (b) Providing turgidity and rigidity to the cell (c) Waste excretion                                                        (d) Locomotion

Answer:

  (b) Vacuoles may be small or large. These are filled with liquid or sap and are membrane-bound organelles. In animal cells, vacuoies are smaller in size and lesser in number than in plant cells. In some plant cells, only one large vacuole is present. The major portion of a plant cell is occupied by vacuoies. The (approx 90% in some cases) either may be contractile (can contract) or non-contractile. When the pressure of the contents of a contractile vacuole increases, it contracts and releases its contents. In unicellular organisms like Amoeba, food particles are present inside food vacuoies. But are not associated with locomotion. The main functions of vacuoies are 1. In animals, vacuoies are often associated with the maintenance of water balance. 2. They work in osmoregulation, i.e., the maintenance of internal pressure. 3. They store various substances including waste products.