Primary consumers: The consumers that feed on plants direcdy, are called primary consumers or herbivores.
Secondary consumers: Those animals, which ear other animals, who ear plants are called secondary consumers. These are also referred ro as primary carnivores.
Tertiary consumers: These are animals who feeds on secondary consumers for their nutrition. These are also referred to as secondary carnivores.
Therefore, due to this interdependence of food/energy between organisms, the chains or webs are formed in the ecosystem.
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$6\text{CO}_2+12\text{H}_2\text{O}\xrightarrow{\text{Light}}\text{C}_6\text{H}_{12}\text{O}+6\text{H}_2\text{O}+6\text{O}_2$