Explain the"FOOD CHAIN"
A food chain is somewhat a linear sequence of links in a food web starting from a trophic species that eats no other species in the web and ends at a trophic species that is eaten by no other species in the web. A food chain differs from a food web, because the complex polyphagous network of feeding relations are aggregated into trophic species and the chain only follows linear monophagous pathways. A common metric used to quantify food web trophic structure is food chain length. In its simplest form, the length of a chain is the number of links between a trophic consumer and the base of the web and the mean chain length of an entire web is the arithmetic average of the lengths of all chains in a food web.
Food chains were first introduced in a book published in 1927 by Charles Elton, which also introduced the food web concept
A Food chain is a series of organisms depending on next one to feed upon. This chain is generally shown by arrow links from prey to its predator. Basically a food chain starts from a plants that eat no other organisms in the chain and ends at a species that is not eaten by any other species. Examples:
Simple Food chain -1 diagram shows a Food chain which starts from plant, then a butterfly sucks nectar from the flower of that plant and subsequently eaten up by lizard, and an eagle is the top level predator who hunts the lizard.
And diagram in Simple Food chain-2 shows a plant leaf-> caterpillar-> bird-> snake -> eagle as food chain components.
The plants and animals living in a forest interact with each other. All the animals, whether they are herbivores or carnivores, are directly or indirectly dependent on the plants for food. The organisms that feed on the plants are eaten by other animals. For example, insects feed on grass and frogs feed on insects. Frogs in turn are eaten by snakes, and snakes form the prey for eagles. This is known as a food chain.