Answer: Herbivores are the primary consumers in the food chain as they feed on the producers like plants. Carnivores feed on herbivores and so they are the secondary consumers or predators of herbivores.
If the herbivore population is increased, initially there will be more availability of food for the carnivores. Due to this, the size of carnivore population increases. As a result, gradually the herbivores now start depleting and they reach to a point that they are not sufficient to feed all the predators. This eventually causes the death of predators so that again the population of herbivore can reach the equilibrium.
If the herbivore population is increased, then the carnivore population will increase also.
In a food chain, energy is passed on from the lower to a higher trophic levels via feeding relationships between organisms. The energy transferred is not 100% according to the laws of thermodynamics.
Since the carnivores are secondary consumers and herbivores are primary consumers, if the herbivore population is increased, then the carnivore population will increase also because there will be more available food.
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