Question

This diagram belongs to a protozoan. This organism belongs to a class

(a)Sporozoa
(b)Sarcodina
(c)Flagellata
(d)Ciliata

Answer 1

Hint: This unicellular organism lives in mainly freshwater. The whole body is covered with a short hairy structure called cilia. They are single-celled, free-living organisms.

Complete step-by-step answer:
Paramecium is a protozoan that belongs to class ciliata. It exhibits a high-level cellular differentiation with several complex organelles that perform a specific function to make its survival possible. It is made up of two membranes, the outer membrane is a layer of flattened membrane-bound sacs and the inner membrane is epiplasm. The body of the cell is surrounded by a rigid but elastic structure called the pellicle. It has an anal pore located on the ventral surface.
General characters of paramecium:
-It is generally found in freshwater bodies like pools, ditches, streams, rivers, lakes, etc. but it is abundantly found in stagnant water, where decaying organic matter is in plenty.
-It feeds on microorganisms like bacteria, algae, and yeasts and shows holozoic nutrition.
-The locomotion occurs with the help of cilia, which also helps in food capture.
-Digestion is intracellular because food gathered into vacuoles.
-Respiration occurs by the body surface through the diffusion process.
-Excretion takes place by contractile vacuole and cytoproct.
-It reproduces asexually by transverse binary fission and sexually by conjugation.
So, the correct answer is ‘ciliata’.

Note: -Cytostome is a fine aperture in the cell membrane of Paramecium by which food particles enter into the cell.
-Cytoproct is an anal opening in the unicellular organisms that involves food vacuole egestion (excretion).