Question

Plankton, Nekton, and Benthos are not the components of one of the ecosystems which are 
(A) Oceans
(B) Freshwater rivers
(C) Grassland
(D) Pond or lake

Answer 1

Hint: Plankton, Nekton, and Benthos are the animals that are related to water bodies like oceans and lakes. They can only survive in the marine ecosystem. They are mostly swimming or floating organisms.

Complete step by step answer:
Plankton, Nekton, and Benthos are not the components of Grassland, because the grassland ecosystem mostly contains grasses and lacks such water bodies where they can survive in. The characteristic of grassland ecosystems, the land on which mostly grass is seen.
So, the correct answer is ‘Grassland’.

Additional Information: Plankton is characterized by tiny aquatic organisms that cannot move on their own. They live in the part of a lake or ocean where the rate of photosynthesis is greater than the rate of respiration. They include phytoplankton and zooplankton. Phytoplankton includes the bacteria and algae that use sunlight to prepare their food. Zooplankton is a tiny animal that feeds on the phytoplankton.

Nekton are aquatic animals that can move on their own by the process of swimming through the water. They may live in any zone whether it is a photic or aphotic zone. They feed on plankton or other nekton. Examples of nekton include fish and shrimp.
Benthos is also the aquatic organisms that crawl in sediments at the bottom of a body of water. Many are decomposers. Benthos include sponges, clams, and anglerfish

Note: Grasslands provide a novel and very diverse climate, which provides a home for some of the foremost strange and distinct animals. Examples of some larger animals that inhabit grasslands are Giraffes, African elephants, bison, black rhinoceros, lions, and ostriches. A variety of smaller animals are also seen like the grasshopper, monarch butterfly, types of worms, and many more.