Microorganisms in Aquatic Ecosystems

Microorganisms play crucial roles in ecosystems as decomposers and producers. They are present in the air, soil, and water, and are mostly harmless. Protists, a type of microorganism, are vital in food webs, especially in aquatic environments. Examples like Euglena and Radiolaria highlight their diverse functions. Diatoms, with their unique cell walls, are significant producers in ecosystems.

What is one of the primary roles of microorganisms in food chains?

• They act as predators.

• They serve as decomposers.

• They are parasites.

• They provide shelter.

Where can microorganisms be found in the environment?

• In air, soil, and water.

• Only in soil.

• Only in water bodies.

• Only on human skin.

How do microorganisms compare in number to visible plants and animals?

• They are not comparable.

• They are less numerous.

• They are equally numerous.

• They far outnumber them.

What is a characteristic of Euglena?

• It is found only in oceans.

• It can photosynthesize and consume food.

• It is a multicellular organism.

• It has a hard outer skeleton.

What role do Radiolaria play in the ecosystem?

• They are producers.

• They are decomposers.

• They are consumers.

• They are parasites.

What is unique about diatoms?

• They have soft cell walls.

• They are not producers.

• They are found only in freshwater.

• Their cell walls form beautiful shapes.

What is the primary function of diatoms in aquatic ecosystems?

• They provide shelter.

• They are parasites.

• They serve as producers.

• They act as predators.

Which of the following is a producer in aquatic ecosystems?

• Radiolaria

• Euglena

• All of the above

• Diatoms

What happens to Radiolaria skeletons after they decompose?

• They are consumed by fish.

• They fall to the seafloor.

• They dissolve in water.

• They float to the surface.

Which of the following is NOT a characteristic of protists?

• They can be producers.

• They are always multicellular.

• They can be consumers.

• They are found in aquatic environments.