Question

In an aqueous environment microscopic animals and plants are collectively known as
A. Herbivores
B. Fauna and flora
C. Planktons
D. Symbionts

Answer 1

An ecosystem consists of living organisms and non-living objects that communicate as a system. For maintaining the balance of the environment, various processes such as primary development, energy flow, decomposition, and nutrient cycling are necessary. Terrestrial, marine, desert, grassland, tundra, freshwater, and forest are different types of ecosystem. Dinoflagellates are collectively microscopic organisms.

Complete answer: Plankton science is known as planktology. Plankton is a word from the Greek, which means drifter or wanderer. Some of the examples of phytoplankton are diatoms, dinoflagellates, algae, etc; are called producer planktons. Plankton is generally known to be water inhabiting organisms. In an aqueous environment, bacteria, archaea, algae, protozoa, and drifting or floating organisms that occupy the saltwater of the ocean and the brackish water of estuaries are marine planktons. Similar to marine planktons, the freshwater plankton is present in freshwaters of lakes and rivers. Plankton contains organisms over a wide variety of sizes, including large organisms such as jellyfish. Although many planktonic species are microscopic in size and plankton is characterized by its ecological niche and motility level, rather than by any phylogenetic or taxonomic classification. Most of the plankton in the ocean are plants. In any of their lives float across the atmosphere, these involve spores of plants, that is, pollen and wind scattered seeds, as well as microorganisms swept from earthly dust storms into the air and oceanic plankton swept by sea spray into the air. Therefore, microscopic animals and plants of the aquatic environment are known as planktons.
So, option C is the correct answer.

Note: Planktons exhibit many different ways to remain afloat in the water. Spikes, like those on a radiolarian, help to spread its weight and delay its sinking over a wide surface area. Many species manufacture oil to hold them afloat, such as copepods and diatoms.