In protozoa like Amoeba and Paramecium, an organ is found for osmoregulation which is:

1. Contractile vacuole

2. Mitochondria

3. Nucleus

4. Food vacuole

In which of the animal dimorphic nucleus is found:

1. Amoeba proteus

2. Trypanosoma gambiens

3. Plasmodium vivax

4. Paramecium caudatum

Which of the following unicellular organism has a macronucleus for trophic function and one or more micronuclei for reproduction:

1. Trypanosoma

2. Paramecium

3. Euglena

4. Amoeba