Question

Benthic organisms are found in
A. Surface of marine water
B. Middle of water in sea
C. Bottom of sea
D. On the ground

Answer 1

Hint: These organisms mostly crawl on the sediments of the water bodies. They include a wide variety of animals. Benthic ecosystems are key links in the estuarine food chains, providing a valuable source of food for fish, birds and mammals. These larger creatures would not be able to live without benthic species.

Complete Answer:
The aquatic organisms are grouped into three types- plankton, nekton and benthos. They are differentiated on the basis of their feeding habits and the zone where they are found.
Aquatic organisms are grouped into three types: plankton, nekton and benthos. They are distinguished on the basis of their feeding habits and the region in which they are found.

(I) Planktons are found floating freely on the surface of the water. They are further classified as phytoplankton and zooplankton. They include fish, bacteria and small animals.
(II) Nektons are living creatures that can float and move independently of the current. They contain the majority of fish and shrimp. They fed on planktons and other small creatures.
(III) Animals found on the seafloor are called benthos. Many of these species have no skeleton and are termed invertebrates. Benthic species have diverse food and feeding habits. Filter feeding involves active or passive sieving of tiny organisms or food particles from the lake or ocean. Other benthos are detritus feeders, that is, they feed on the bottom sediments.

The majority of benthic species are invertebrates and can be subdivided into two groups: epifauna (animals living on or connected to sediments, gravel, gravel, shells, piles or bottom plants, shallow subtidal zones) and infauna (animals living on sandy or muddy surfaces of the lagoon floor).

Thus, the correct answer is option C i.e, Bottom of sea.

Note: Benthic ecosystems are diverse and contain a wide variety of animals, plants and bacteria from all stages of the food web. They include oysters, clams, mussels, and shrimp-like crustaceans.