Question

Actively moving organisms in aquatic ecosystem are
A) Benthos
B) Zooplankton
C) Phytoplankton
D) Nekton

Answer 1

Hint: An aquatic ecosystem is one that exists within the limits of a body of water. Aquatic ecosystems are communities of species that are interdependent on one another and their surroundings. Marine ecosystems and freshwater ecosystems are the two major groups of aquatic ecosystems.

Complete answer:
Plankton, nekton, and benthos are the three major classes of aquatic organisms. These aquatic organisms vary in the way they move and the place they live.
A) Benthos: Benthos are aquatic organisms that crawl in sediments at the water's floor. Most of them are decomposers. Sponge, clams, and anglerfish are examples of benthic organisms.
B) Zooplankton: Plankton are tiny aquatic creatures that are incapable of moving on their own. The photic zone is where they live. Zooplankton are microscopic organisms that eat phytoplankton.
C) Phytoplankton: Plankton are tiny aquatic creatures that are incapable of moving on their own. The photic zone is where they live. Algae and bacteria that use sunlight to make food are known as phytoplankton.
D) Nekton: Nekton are aquatic organisms that can travel by “swimming” in the sea on their own. They can be found in either the photic or aphotic zones. Plankton and other nekton are their main sources of food. Fish and shrimp are examples of nekton.

Therefore, the correct option is D) Nekton, as the actively moving organisms in aquatic ecosystem are Nekton.

Note: The photic and aphotic zones are two oceanic zones that are classified vertically based on light penetration. The photic zone receives sunshine, which allows photosynthesis to take place. The aphotic zone is the area of the ocean that receives no sunshine. This region is not exposed to the sun.