food webs & food chains

SCIENCE – FORM TWOSCIENCE – FORM TWO

FOOD WEBs & FOOD FOOD WEBs & FOOD CHAINsCHAINs

Created by: Alison OngCreated by: Alison Ong

EVALUATIONACTIVITIESVIDEOCONTENTS

WHAT IS A FOOD CHAIN ?WHAT IS A FOOD CHAIN ?

A shows how each A shows how each livingliving

thing gets its food. Some animals eat thing gets its food. Some animals eat plants and some animals eat other plants and some animals eat other animals. animals.

EXAMPLE OF A FOOD EXAMPLE OF A FOOD CHAINCHAIN

Food Food WebWeb

A A food webfood web is a model that shows all the is a model that shows all the possible feeding relationships between possible feeding relationships between organisms living in an ecosystem. organisms living in an ecosystem.

What are the differences What are the differences between food webs and between food webs and

food chains?food chains?

A food web is actually several food chains joined together.

How many food chains can you make from this food web?

WHAT IS IN A FOOD CHAIN WHAT IS IN A FOOD CHAIN ??

PRODUCERSPRODUCERS

CONSUMERSCONSUMERS

DECOMPOSERSDECOMPOSERS

ProducerProducerss

Plants get their energy from the Plants get their energy from the sun. They are sun. They are producersproducers because they make their own because they make their own food using energy from the sun. food using energy from the sun.

CONSUMERSCONSUMERS

Consumers hunt, gather, and Consumers hunt, gather, and store food because they store food because they cannot make their own.cannot make their own.

Three Types of Three Types of ConsumersConsumers

Omnivores

Herbivores

Carnivores

HerbivoresHerbivores

A herbivore is an animal that gets A herbivore is an animal that gets its energy from eating plants.its energy from eating plants.

Large Herbivores Medium-sized Herbivores Small Herbivores

CarnivoreCarnivore

A carnivore is an animal that gets food A carnivore is an animal that gets food from killing and eating other animals. from killing and eating other animals.

Large Carnivores Medium Carnivores Small Carnivores

OmnivoreOmnivore

An omnivore is a kind of animal An omnivore is a kind of animal that either eats other animals or that either eats other animals or plants. plants.

Large Omnivores

Medium-sized Omnivores

Small Omnivores

Decomposers and Decomposers and scavengers scavengers

Scavengers Scavengers

Decomposers Decomposers

Let’s Look at a Food Let’s Look at a Food ChainChain

A food chain is a simplified A food chain is a simplified way to look at the energy way to look at the energy that passes from producers that passes from producers to consumers.to consumers.