Question

what is a trophic level? describe optional trophic levels (first,second,ect)in a given community of organisms? help me!!

Answer 1

Answer:

Trophic level, step in a nutritive series, or food chain, of an ecosystem. The organisms of a chain are classified into these levels on the basis of their feeding behaviour. The first and lowest level contains the producers, green plants. The plants or their products are consumed by the second-level organisms—the herbivores, or plant eaters. At the third level, primary carnivores, or meat eaters, eat the herbivores; and at the fourth level, secondary carnivores eat the primary carnivores. These categories are not strictly defined, as many organisms feed on several trophic levels; for example, some carnivores also consume plant materials or carrion and are called omnivores, and some herbivores occasionally consume animal matter. A separate trophic level, the decomposers or transformers, consists of organisms such as bacteria and fungi that break down dead organisms and waste materials into nutrients usable by the producers.

Explanation:

A. An ecosystem is stable, settled unit of nature consisting of a community of organisms interacting with each other and with their surrounding physical and chemical environment.

B. A habitat is a place where an organism lives and represents a particular set of environmental conditions suitable for its successful growth.

C. A community is a group of populations of different species in a given area.

D. Species is a group of individuals which resemble each other in morphological, physiological, biochemical and behavioural characters.

E. The planet Earth along with its atmosphere (air, land and water) that sustain life is called biosphere.

Hence, Different populations of organisms livng together in a given area are called community.

So, the correct answer is 'A community'.

Answer 2

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➝ The various steps in a food chain at which the transfer of food or energy take place is called trophic level.

• In other words trophic level means feeding of the organism.

➝ First trophic level :-In first trophic level the plants are producers or autotrophs and constitue the first trophic level.They fix up the sun's energy and make it available for consumers or heterotrophs.

➝ Second trophic level :- In second trophic level, herbivores which feed upon plants constitue the second trophic. Herbivores are called primary consumers.

More Information :-

• Carnivores that feed upon herbivores constitute the third trophic level.It is called secondary consumers.

• Top carnivores which feed upon small carnivores constitute the fourth trophic level.It is called tertiary consumers.