Question

Which is not true for paramecium?
A. Under unfavorable conditions, forms cysts
B. Presence of large number of cilia on whole body surface
C. Contains contractile vacuoles for osmo-regulation
D. Use pseudopodia for capturing prey

Answer 1

Hint: Paramecium is a single celled organism. They have a small size and they form protective layer cyst which act as a protective layer. Cilia provide locomotion to them. Contractile vacuoles help in osmoregulation. Food is stored in the vacuoles. Cilia help in engulfing food.

Complete answer:
Paramecium is a unicellular organism. The size of the paramecium is small, ranging from 50 to 300um. Size can vary from species to species. Paramecium are typically elongate, ovoid, foot-or cigar-shaped. They are mostly found in freshwater. It belongs to the kingdom Protista. They are a well known genus of ciliate protozoa. Paramecium can have several contractile vacuoles. It helps them to regulate the water concentration within the cell. Paramecium shows holozoic mode of nutrition. Large numbers of cilia are present on the whole body surface. It engulfs the food using cilia. Formation of cysts occurs in unfavorable conditions. When there is favorable conditions again, the cyst releases many organisms. Osmoregulation occurs through contractile vacuole. It also helps in throwing excess water from the body. They have a special feature that is trichocysts for capturing prey.
From the above information we have found that paramecium does not have pseudopodia for capturing prey.

Hence, the correct answer is option (D).

Note: The pellicle structure is present on the body of paramecium which enclosed it by a stiff. Cell membrane has alveoli sac. Trichocysts are explosive organelles that are used for defensive purposes as they discharge non-toxic filaments. Cytoproct or anal pore is located on the ventral surface. Locomotion occurs with the help of cilia. More than half of the energy of Paramecium is used up in propelling itself through the water.