Pesticides enter the food chain when they are washed into the soil or water bodies. Plants absorb them along with water and minerals, and they are then taken up by aquatic organisms, entering the ecosystem’s food chain.

Energy availability decreases at higher trophic levels because of the energy loss at each step, with only about 10% of the energy being transferred to the next level.

As energy moves through the various trophic levels, it diminishes progressively. This is due to the loss of energy at each level, mainly as heat.

The flow of energy in an ecosystem is unidirectional. Energy captured by autotrophs does not revert back to the sun, and energy passed to herbivores does not return to the autotrophs.

A food web is a network of interconnected food chains. It shows the multiple feeding relationships among organisms, where each organism is usually eaten by two or more other kinds, and in turn, eats several other organisms. Unlike a straight ...