CBSE Class 10 Answered

Trophic levels are the feeding position in a food chain such as primary producers, herbivore, primary carnivore, etc. Each step or level of the food chain forms a trophic level. Green plants form the first trophic level, the producers. Herbivores form the second trophic level, while carnivores form the third and even the fourth trophic levels. Food chains generally consist of only 3 or 4 trophic levels, since very little usable energy remains after 4 trophic levels. There are generally a greater number of individuals at the lower trophic levels of an ecosystem. Each higher trophic level contains fewer organisms than the level below it.