Food Chain And Food Web
Every living being on the earth needs the energy to survive. The sun is the source of energy. The plants are autotrophs they get energy from soil, water, and the sunlight. Similarly, animals also need energy. Animals are not autotrophs that is they rely completely on plants and other animals for the energy. Animals get energy when they eat food.
Food Chain
The dependency of plants and animals can better be explained with the help of a food chain.
For example
The grass is the food for cattle, the cattle can be the food lions. The lion cannot eat grass. The cattle can not eat lion. In this way the balance of an ecosystem is maintained. The energy is transferred from one living being to another.
Food web
One animal can be part of more than one food chain. Suppose there are four animals in a food chain. Out of four three can have their presence in another food chain. The multiple food chains, thus form a food web.
For instance, the mouse can be the prey of a cat or a snake. The cat and snakes are members of different food chains. The mouse can connect with more than one food chain.
Links of the Food Chain
Autotrophs
Autotrophs are plants. They prepare their own food from sunlight, water, and carbon dioxide gas. The plant's food preparation process is called photosynthesis.
Heterotrophs
Heterotrophs are animals. They are dependent on plants and other animals for having their food. They are the consumers of plant materials are known as Primary Consumers. The carnivores are called secondary and tertiary consumers. The bigger carnivorous animals like lions are the tertiary consumers
Decomposers
Decomposers are worms, bacteria, and fungi. They decompose and decay dead animals and plant materials. They make the soil fertile for the plants by giving back nutrients.
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