aim: what are food chains, webs and pyramids? construct models to demonstrate that organisms are...

AIM: What are Food Chains, Webs and Pyramids?

Construct models to demonstrate that organisms are

related by how energy is transferred in an ecosystem

Food chainFood chain

Food pyramidFood pyramid

Food webFood web

Food chainFood chain

Food pyramidFood pyramid

Food webFood web

AIM: What are Food Chains, Webs and Pyramids?

Examine this picture

What is this caterpillar doing

Examine this picture

Now what happened to the caterpillar ?

Arrange these organisms as to WHO eats WHO

What does the food chain tell us about the relationship of organisms in that food chain?

What does the food chain tell us about the flow of energy in the chain?

DEFINES: the flow of energy from one animal to another

It defines “who” eats “who”

What might happen if there were no

caterpillars

What might happen if there were less mice?

WRITE DOWN A FOOD CHAIN IN YOUR NOTEBOOK

for hawks, berries, & birds

BERRIES

BERRIES

BIRDS

HAWKS

EXAMINE THESE TWO FOOD CHAINS

Leaves worms bird

berries Squirrels hawks

However, do birds only eat worms?

What else do birds eat?

What else might hawk eat?

Does this give MORE detail or LESS detail then the food

chain model?

A food web shows more interactions of organisms

then a food chain!

In a FOOD WEB, Green Plants are referred to as … ?

In a FOOD WEB, Green Plants are referred to … ?

What level consumer are the rabbit, mouse, grasshopper and termite?

What level consumer are the rabbit, mouse, grasshopper and termite?

What level

consumer are the the fox, snake, shrew,

and bird?

What level

consumer are the the fox, snake, shrew,

and bird?

Now what level

consumer is the

mouse?

Now what level

consumer is the

mouse?

What level is the fox now?

What level is the fox now?

What happens to ALL plants and

animals after

they die?

What happens to ALL plants and

animals after

they die?

What Animal is this?

How many mice does he need to eat per day/week?

How many grasshoppers do two mice need to eat per day

or per week week?

How much grass do those “hoppers” need?

What is grass called?

What are the “hoppers” called?

What are the mice called?

What is the hawk called?

What is the hawk called?

This in an example of ???

FOOD PYRAMID

It takes more animals of a lower level to support the level above it

As you move up the pyramid, there is less and less energy

It take more grass to support a population of “hoppers”

It take more hoppers to support a population of mice

It take more many mice to support just on hawk!

Dec

reas

ing

Num

ber o

f Org

anis

ms D

ecreasing Am

ount of Energy

A food pyramid

•is a model of a food chain

•Shows the flow of energy

•Shows the amount of energy in terms of the number of organisms

•Shows THAT greater populations of organisms are needed at lower levels on the pyramid, to support smaller populations at the top of the pyramid.

REVIEW VOCABULARY – AND THE AIM – AND THE OBJECTIVES

AIM: What are habitats and niches?

Construct models to demonstrate that organisms are related by how energy is transferred in an ecosystem

Food chain, Food Food chain, Food pyramid,pyramid,

Food webFood web

Food chain, Food Food chain, Food pyramid,pyramid,

Food webFood web

Class Activity:

Worksheets

Word Problems

AIM: What are habitats and niches?

Homework:

INTERNET QUESTIONS

Paragraph

AIM: What are habitats and niches?