Question

Why do Amoeba have Contractile Vacuoles?

Answer 1

Hint: Amoeba is a unicellular organism which has pseudopodia or they do not have any legs or locomotory structures for locomotion. Amoeba reproduces by asexual reproduction. Amoeba possess one way feeding mechanism and excretion mechanism that is vacuoles. Vacuoles are pores depending on sizes; vacuoles can be bigger or smaller.

Complete answer:
Generally large Vacuoles are present in unicellular organisms which lack openings. For example- paramecium and amoeba. Amoeba as a unicellular organism possess water and to eliminate excessive amounts of water vacuoles are for. By the help of vacuoles, amoeba eliminates excessive water from its body. If water stays inside the body for longer duration the body starts to swell and eventually leads to death of the organism.
Also, contractile vacuoles balance the osmotic pressure within the cell. Or we can say that contractile vacuoles contribute to osmoregulation. For example- protists and unicellular algae. As the contractile vacuoles are open pores hence water entering into the body does not remain constant. So, continuous proton pumping is required in order to influx and outflux the water from the organism body. Food vacuoles in amoeba helps in digestion of food and also transporting the food via that vacuole only.

Note:
Amoeba as we discussed contain cytoplasm like any other organism. Amoeba contain vacuoles which is important because they perform osmoregulation. Osmoregulation is the mechanism to maintain intracellular water balance and to expel excess water from the cell.