Question:

Many freshwater animals cannot live for a long in sea water and vice versa mainly because of the

Updated On: Jul 28, 2022
  • Change in N level
  • Change in the levels of thermal tolerance
  • Variation in light intensity
  • Osmotic problems
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The Correct Option is D

Solution and Explanation

Organisms found in fresh water have a problem of excess internal water because of endosmosis. Organisms found in ocean or saltish water have a problem of low internal water content due to exomosis. For aquatic organisms the quality (chemical composition, pH) of water becomes important. Many freshwater animals cannot live for long in sea water and vice versa because of the osmotic problems they would face.
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Concepts Used:

Organisms and their Environments

Ecology is the branch of biology that involves the study of the interactions that takes place between an organism and its environment. Any biological organization consists of 4 levels, namely, Organisms, Populations, Biomes, and Communities.

Organisms:

An Organism is an attached living system that lives in an environment. They are able to retain specific behaviours and structure such as bacteria, fungi, plants, animals, and humans. A population is formed by the collection of all these organisms. The collection of population forms a community that helps in the operation of ecosystems.

Environment:

The study of the interaction of organisms in an area with the surrounding environment is Ecology. This interaction constitutes an overall adaptation of the organisms to their environment that also includes the continuity of species.

The environment comprises of both biotic (living things) and abiotic components (non-living things)

Food Chain:

Food Chain is the transfer of food energy from the plant source through a series of organisms that consume and are consumed.

Grass(Producer) → Deer(Herbivore) → Tiger(Carnivore),  Grass(Producers) → Insect(Herbivores) → Frog(Carnivores) → Snake(Secondary Carnivore).

Food Web:

Food web is the interlocking pattern of multiple food chains in the ecosystem. In this, many food chains are interconnected and there are increased possibilities of eating and getting eaten by different organisms of various species.