EVERYDAY SCIENCE

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: -Herbivores, organisms that eat plants and other autotrophs, are the second trophic level. Carnivores are the third trophic level. Omnivores, creatures that consume a wide variety of organisms from plants to animals to fungi, are also the third trophic level.

Detailed explanation-3: -So, the correct answer is ‘Food web’.

Detailed explanation-4: -Trophic level five consists of apex predators; these animals have no natural predators and are therefore at the top of the food chain. Decomposers or detritivores are organisms which consume dead plant and animal material, converting it into energy and nutrients that plants can use for effective growth.

Detailed explanation-5: -Primary consumer and herbivores feed on producers only. A carnivore feeds on herbivore only. An omnivore can derive its nutrition from both herbivore (primary consumer) and carnivore (secondary consumer) and thus can feed on several trophic levels. Humans are examples of omnivores.