Question

short note of food web

Answer 1

A food web (or food cycle) is a natural interconnection of food chains and a graphical representation (usually an image) of what-eats-what in an ecological community. Another name for food web is consumer-resource system. Ecologists can broadly lump all life forms into one of two categories called trophic levels:
1) the autotrophs
2) the heterotrophs.
To maintaintheir bodies, grow, develop, and to reproduce, autotrophs produce organic matter from inorganicsubstances, including both minerals and gases such as carbon dioxide. These chemical reactions require energy, which mainly comes from the Sun and largely by photosynthesis, although a very small amount comes from hydrothermal vents and hot springs. A gradient exists between trophic levels running from complete autotrophs that obtain their sole source of carbon from the atmosphere, to mixotrophs(such as carnivorous plants) that are autotrophic organisms that partially obtain organic matter from sources other than the atmosphere, and complete heterotrophs that must feed to obtain organic matter. The linkages in a food web illustrate the feeding pathways, such as where heterotrophs obtain organic matter by feeding on autotrophs and other heterotrophs. The food web is a simplified illustration of the various methods of feeding that links an ecosystem into a unified system of exchange. There are different kinds of feeding relations that can be roughly divided into herbivory, carnivory, scavenging and parasitism. Some of the organic matter eaten by heterotrophs, such as sugars, provides energy. Autotrophs and heterotrophs come in all sizes, from microscopic to many tonnes - from cyanobacteria to giant redwoods, and from viruses and bdellovibrio to blue whales.

Answer 2

Answer:

A food web consists of all the food chains in a single ecosystem. Each living thing in an ecosystem is part of multiple food chains. Each food chain is one possible path that energy and nutrients may take as they move through the ecosystem

Explanation:

A food web is made up of interconnected food chains.

Most communities include various

populations of producer organisms which are eaten by any number of consumer

populations.

The green crab, for example, is a consumer as well as a decomposer.

The crab will eat dead things or living things if it can catch them.

A secondary consumer may also eat any number of primary consumers or producers.

This non-linear set of interactions which shows the complex flow of energy.

In a food web nutrients are recycled in the end by decomposers.

Animals like shrimp and crabs can break the materials down to detritus.

Then bacteria reduce the detritus to

nutrients. Decomposers work at every level, setting free nutrients that form an essential

part of the total food web.