Everything Life Sciences Grade 10

Figure 9.17: Pyramid of numbers.

Food web DUMMY

Afood web is made up of a number of food chains. It represents the different feeding

relationships in an ecosystem or a biome. It is usually more complicated than a food chain

because organisms can get their energy or food from more than one source. The presence

of a number of food sources makes the system more stable. If one organism is removed,

the whole system will not collapse, unlike in a single food chain. A food web in a typical

Savanna environment is shown in Figure 9.18.

Figure 9.18: The figure shows a food web in a typical Savannah environment.

Activity: Understanding food chains and pyramids

Aim:

Gainconceptual understanding of food chain

Materials:

280 9.6. Energy flow