OBJECTIVE FORESTRY

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: -In ecology, a trophic level pertains to a position in a food chain or ecological pyramid occupied by a group of organisms with similar feeding modes. A food chain refers to the hierarchy in which organisms in an ecosystem are grouped into trophic (nutritional) levels.

Detailed explanation-3: -Trophic structure is defined as the partitioning of biomass between trophic levels (subsets of an ecological community that gather energy and nutrients in similar ways, that is, producers, carnivores).