AP BIOLOGY

Detailed explanation-1: -The first and lowest level contains the producers, green plants. The plants or their products are consumed by the second-level organisms-the herbivores, or plant eaters. At the third level, primary carnivores, or meat eaters, eat the herbivores; and at the fourth level, secondary carnivores eat the primary carnivores.

Detailed explanation-2: -There are three trophic levels. Because autotrophs do not consume other organisms, they are the first trophic level. Autotrophs are eaten by herbivores, organisms that consume plants. Herbivores are the second trophic level.

Detailed explanation-3: -The primary consumers are herbivores (vegetarians). The organisms that eat the primary consumers are meat eaters (carnivores) and are called the secondary consumers. The secondary consumers tend to be larger and fewer in number. This continues on, all the way up to the top of the food chain.

Detailed explanation-4: -Level 2: primary consumers The next trophic level in a food chain or an ecological pyramid is trophic level 2. In this level, the organisms occupying this level feed on the primary producers and are called primary consumers. Animals that feed on plant materials are called herbivores.