EVERYDAY SCIENCE

Detailed explanation-1: -Answer and Explanation: Of the three organisms listed, only amoebas and paramecia are both unicellular and heterotrophic.

Detailed explanation-2: -Paramecium are heterotrophs, meaning they must consume food for their energy. The area of the paramecium that appears pinched inward is called the oral groove, which runs about half the length of its body. Cilia sweep food into this area and into the gullet, where food vacuoles are formed.

Detailed explanation-3: -Amoebae are single-celled eukaryotic microorganisms that move by cytoplasmic streaming and possess characteristic surface projections of the cell known as pseudopodia. They are categorised among the heterotrophic protozoa and are grouped with photosynthetic protozoa and algae in an eclectic group, the protists.

Detailed explanation-4: -Protists that depend on other living things for nutrition are called heterotrophs. They can be predators or parasites. Example: Amoeba, Plasmodium.

Detailed explanation-5: -Amoebas and paramecia share the common traits of being single-celled organisms, being heterotrophs, and reproducing through mitosis. The term heterotroph means that they do not produce their own food through photosynthesis.