Food Chains & Food Webs

The video tutorial explains the concept of food chains and food webs, highlighting the flow of energy from the sun through various organisms. It describes how energy is transferred and lost at each step of a food chain, typically involving four steps. The tutorial also introduces food webs, which are interconnected food chains, and discusses the interdependence of species within these webs. It emphasizes the potential consequences of altering a food web, such as the extinction of a species, which can have significant impacts on the entire ecosystem.

What is the primary source of energy for most living organisms in a food chain?

• The sun

• The moon

• The ocean

• The soil

In a food chain, what do the arrows represent?

• The direction of energy flow

• The size of the organism

• The speed of the predator

• The color of the prey

Why are food chains typically limited to around four steps?

• Because of the limited number of species

• Due to energy loss at each step

• Because predators are scarce

• Due to the abundance of producers

What is a food web?

• A single food chain

• A network of interconnected food chains

• A diagram of predator sizes

• A list of all producers

What might happen if a species is removed from a food web?

• The food web becomes simpler

• Nothing changes

• Only the removed species is affected

• It can cause a chain reaction affecting multiple species