Question

Amoeba sticks to the substratum by means of
A. Rough surface
B. Plasmalemma
C. Protein
D. None of the above

Answer 1

Hint: Amoeba is a unicellular protozoan found in ponds with irregular shapes. Amoeba shows creeping movement in which it produces pseudopodia. This is known as an amoeboid movement.

Complete answer: Amoeba is a unicellular organism that has an irregular shape. They are usually found in still water bodies like ponds, lakes, etc. Amoeba contains a cell membrane, cytoplasm, nucleus, food vacuoles, and contractile vacuoles. Amoeba moves by the means of pseudopodia (meaning false legs) that are the extended part of the cell membrane. It also helps amoeba to catch preys. The body of amoeba that is the cytoplasm and cell membrane flows around the food particle and engulfs it forming food vacuoles. Reproduction in amoeba is done by fission or sporulation.

Whenever amoeba moves it extends its cytoplasm and cell membrane (also known as the plasmalemma) forward which leads to the formation of pseudopodia that helps the amoeba to stick to the surface or substratum. This process is known as extension.
Hence, the correct answer is option B.

Note: Vacuoles present in amoeba are said to be the storage unit of the cell. Contractile vacuoles can change the shape according to their needs. In amoeba, vacuoles help in removing waste present in the body. Food captured by amoeba is also present in the form of food vacuole.