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