The first component is the producers or autotrophs (in Greek, ‘auto’ means self, and ‘tropheâ€™ means nourishment or food). They can produce their own food by photosynthesis.A process in which they use solar energy and carbon dioxide from the atmosphere and convert it into food and oxygen. This includes all the green plants, algae, and some bacteria. Every food chain that exists in the ecosystem starts with these autotrophs. The solar energy that they capture is able to sustain the entire ecosystem.
The next component is heterotrophs (in Greek, â€™heteroâ€™ means other and â€˜tropheâ€™ means nourishment or food) or the consumers. They cannot produce their food like autotrophs. They feed on plants or other animals to fulfill their food reqirement. It includes man and other animals, some fungi, and bacteria. These consumers are again divided as primary consumers, secondary consumers, and tertiary consumers in the food chain.
The primary consumers are herbivores that feed on plants or even algae. It includes some insects, some mollusks, cow, rabbit,etc.The organisms that eat these primary consumers are secondary consumers. These are carnivores that feed on meat. The organism that eat secondary consumers are tertiary consumers. They are the top carnivores in a food chain. The organisms that hold the topmost position in a food chain are called the apex consumer or predator.
The last component of this food chain is decomposers. They break down the organic material of dead organisms and the wastes and use them as nutrients for growth. In an ecosystem, fungi and bacteria are important decomposers. Others include the detritivores that eat the debris material and make it available to other decomposers. Examples are earthworms, vultures, etc.
Types of Food chain
There are two basic food chains:
Grazing food chain
Detritus food chain
Grazing food chain starts with the autotrophs that are eaten by the herbivores, which in turn are fed on by carnivores. These food chains are highly dependent on the solar energy. Grazing food chains are again of two types, namely, Predator food chain and Parasitic food chain.
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