LIFE SCIENCE

Detailed explanation-1: -The bottom and largest level of the pyramid is the producers and contains the largest amount of energy. As you move up the pyramid, through the trophic levels to primary, secondary and tertiary consumers, the amount of energy decreases and the levels become smaller.

Detailed explanation-2: -The top layer of the energy pyramid contains apex predators. These are mostly carnivorous animals that have no natural predators. The pyramid shape is used to represent the flow of energy because of the way that energy is used up and lost throughout the system.

Detailed explanation-3: -The top level of an energy pyramid has the fewest organisms because it has the least amount of energy. Eventually there is not enough energy left to support another trophic level; thus most ecosystems only have four trophic levels.

Detailed explanation-4: -So the trophic level at the base has maximum energy and that at the top has the least amount of energy. Hence energy pyramid is broader at the base and narrower at the top.