Topic: PROTISTA (UNICELLULAR EUKARYOTES)

Q:

Two species of Amoeba X and Y were kept in fresh water and got adapted. Species X developed contractile vacuole.When both were transferred to sea water and got adapted,Both X and Y lost their contractile vacuole. From  theseObservation we conclude that

(a) :  Both X and Y are marine species
(b) :  Species Y is marine and X is fresh water
(c) :  Species X is marine and Y is fresh water
(d) :  Both X and Y are fresh water
Answer:  Species X is marine and Y is fresh water
Explanation:  

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