If the number of carnivores in a forest becomes more than the number of herbivores, the population of herbivores will decrease, as carnivores feed on herbivores. Decrease in the population of herbivores will further lead to an increase in the population of green plants (producers), as herbivores feeds on green plants. Hence, if the population of any of the members in a food chain increases or decreases, it will affect the population of other members. Their number will either increase or decrease substantially.