Food Chains and Webs Concepts

The video tutorial explains the concept of food chains and food webs, highlighting how energy flows from the sun through various organisms. It discusses the role of producers, consumers, and decomposers, and how energy is lost at each step. The tutorial also introduces food webs, showing the interdependence of species and the potential impacts of changes within the web, such as species extinction, on the entire ecosystem.

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

• The Moon

• The Wind

• The Sun

• The Ocean

In a food chain, what do the arrows represent?

• The direction of energy flow

• The size of the organism

• The speed of the organism

• The color of the organism

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

• Lion

• Grass

• Zebra

• Decomposer

Why are food chains typically not longer than four steps?

• Not enough sunlight

• Too many predators

• Energy loss at each step

• Lack of space

How is energy lost in a food chain?

• As heat during respiration

• By changing color

• By growing larger

• Through photosynthesis

What is a food web?

• A map of the ocean

• A type of spider web

• A diagram of interconnected food chains

• A single food chain

What happens when a species in a food web goes extinct?

• Only prey are affected

• Only predators are affected

• It affects the entire system

• Nothing changes

In the woodland food web example, what happens if grasshoppers are removed?

• Spiders eat more beetles

• Beetles increase in number

• Snails go extinct

• Lions eat more grass

What is the consequence of fewer individuals eating green plants?

• Lions eat more zebras

• Beetles go extinct

• Snails have more food

• Green plants decrease

What is the overall impact of altering one link in a food web?

• Only affects top predators

• Only affects decomposers

• Big consequences for the whole system

• No impact