The biomass and amount of energy and number of individuals is decreased as we go up the trophic levels.
A food chain is a linear sequence of distribution of food and energy among organisms. In an ecosystem one organism is consumed by another organism in order to gain energy. A quaternary consumer species consume population of secondary consumer species. A quarter consumer species would be expected to have a smaller population than a secondary consumer species because increase of quarternary population more than secondary consumer species will create scarcity of secondary consumer species which will result in decline of quarternary consumer species. Hence, to maintain the balance in nature, the quarternary species should be smaller than population of secondary consumer species.
The above statement is true
A quaternary consumer species would be expected to have a smaller population than a secondary consumer species.Explanation;Energy in a ecosystem decreases as you move from one energy level to another therefore the number of species will decrease as the energy decreases as you move up the trophic levels.Therefore, secondary consumers will have a smaller population than that of primary consumers as primary consumers receive more energy than the secondary consumers. Hence, the same applies form the quaternary consumers, their population is smaller than that of the secondary consumers.