Question

Decomposer protists are _______.
A. Diatoms
B. Dinoflagellates
C. Slime Molds
D. Euglenoid

Answer 1

Hint: The organisms that are concerned with breakdown of dead remains and organic wastes of other organisms are termed as decomposers. Protists are specific kinds of organisms that can neither be categorised as plants, animals or fungi.

Complete Answer
Let's study each of the options given above in detail to find the correct option.
Diatoms are single-celled algae. They sleep in houses made from glass. Their cell wall is composed of transparent, opaline silica which is ornamented by intricate and striking patterns of silica. It is a photosynthetic eukaryote that can produce its own food. Therefore, it is clearly not a decomposer. Thus, it is an incorrect option.
Dinoflagellates are a gaggle of primarily unicellular organisms. They are usually good organisms in an aquarium because their reproductive capacity is moderate and thus, easily controllable. A number of them like oxyrrhis marina eat other dinoflagellates, which helps in controlling their population. It is clear that they do not function as decomposers, therefore, B is an incorrect option.
Slime moulds (or slime molds) were earlier grouped under fungi, however, later they're kept within the kingdom Protista with other unicellular and little multicellular eukaryotic organisms. They are saprophytic and prey on dead and decaying organic matter. Since it constitutes all the characteristics of a decomposer protist, it can be considered as the correct option.
Euglenoids are often found in both fresh and stagnant water. Euglenoids are unicellular, phototrophic organisms. Some species of euglenoids, however, have chloroplasts and are ready to supply a minimum of a number of their food needs through photosynthesis. They cannot be deemed as decomposers. Thus, it isn't a correct option.

Therefore, option C is the correct answer.

Note:
Euglenoids have flexible cell coverings, move about freely, and ingest their food through a structure called a gullet, many scientists have classified the euglenoids as animals in different types of classifications