The Energy Journey Through Food Chains and 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 food chains typically consist of four steps and how energy is lost at each step. The tutorial also covers the interdependence of species within a food web and the potential consequences of altering a food web by removing a species. Examples from a woodland environment illustrate these concepts, showing how changes can affect population sizes and ecosystem balance.

What is the primary source of energy for most living organisms?

• The Wind

• The Ocean

• The Sun

• The Moon

In a food chain, which direction do the arrows point?

• From the feeder to the food

• In both directions

• They do not point

• From the food to the feeder

Which organism is considered the top predator in a food chain?

• The one that is eaten by others

• The one that eats others and is not preyed upon

• The one that is the largest

• The one that is the smallest

What is the role of decomposers in a food chain?

• They are top predators

• They consume dead organisms

• They produce energy from the sun

• They are primary consumers

Why do food chains typically have around four steps?

• Due to environmental laws

• Because of space constraints

• Because of limited species

• Because of energy loss at each step

How is energy lost between steps in a food chain?

• Through sound

• Through photosynthesis

• Through heat during respiration and waste

• It is not lost

What is a food web?

• A network of plant roots

• A type of spider web

• A diagram of interconnected food chains

• A single food chain

What happens if a species is removed from a food web?

• The food web becomes stronger

• Only the removed species is affected

• It affects the entire system unpredictably

• Nothing changes

What is the consequence of fewer individuals eating green plants in a food web?

• The plant population remains the same

• The plant population becomes extinct

• The plant population increases

• The plant population decreases

What is the effect of a food web being altered?

• It has no effect

• It affects only the top predator

• It has different effects on different populations

• It strengthens the food web