Aim: How is a food chain different than a food web? - PowerPoint Presentation

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Aim: How is a food chain different than a food web?

ObjectivesLearn how a food chain is different from a food web.Learn how to create a food chain and food web.Learn how to analyze the interdependence of one organism to another.

Food WebSlide2

Life in an ecosystem requires a source of

energy. Slide3

Food Chains and Food Webs are similar because they both

model the flow of energy in an ecosystem.Slide4

However, food chains are simple!!

A food chain is a simplified way to look at the energy that passes from producers to consumers.Because we know each predator does not eat only 1 type of prey.Slide5
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What is a Food Web?

A more realistic way of looking at the relationship of plants and animals in an environmentSeveral food chains linked togetherA predator from one food chain may be linked to the prey of another food chainSlide7

Food Webs are more realistic and more complicated.

notice all the different arrowsSlide8

Food Webs are realistic because predators eat mor

e than 1 type of prey.Slide9

Lesson Summary Questions

What does all life in an ecosystem require?What is a food chain and a food web similar?How is a food chain different than a food web?What is another name for producer?

What are consumers also called?Slide10

Check for Understanding!!!7

. Create a correct food chain with the following organisms below. Simple Food ChainSlide11

Check for Understanding!!! 8. Create

an appropriate food chain for the pond ecosystem below. Medium Difficult Food ChainSlide12

Check for Understanding!!!9.

Create an appropriate food chain for the pond ecosystem below.Difficult Food Chain

Hawk

Deer

Raccoon

Frog

Dragonfly

Water liliesSlide13

Check for Understanding!!!10. Create an appropriate

food web with the organisms below.Simple Food WebSlide14

Check for Understanding!!!11. Create an appropriate

food web for the pond ecosystem below.Difficult Food WebSlide15

Let’s Check for UnderstandingRegents Based Questions

1. The diagrams represent four members of a food chain. Which sequence best represents the transfer of energy between these organisms?toads – predaceous insects – herbivorous insects – plantspredaceous insects – herbivorous insects – plants – toadsplants – herbivorous insects – predaceous insects – toads

plants – herbivorous insects – toads – predaceous insectsSlide16

Let’s Check for UnderstandingRegents Based Questions

2. Which sequence shows a correct pathway for the flow of energy in a food chain?bacteria – grass – fox – owlgrass – grasshopper – frog – snakefungi – beetle – algae – mousealgae – snake – duck – deerSlide17

Let’s Check for UnderstandingRegents Based Questions

3. A food web is more stable than a food chain because a food webtransfers all of the producer energy to herbivoresreduces the number of niches in the ecosystemincludes alternative pathways for energy flowincludes more consumers than producersSlide18

Let’s Check for UnderstandingRegents Based Questions

4. Which type of model provides the most complete representation of the feeding relationships within a community?a material cyclea predator-prey associationa food chaina food webSlide19

Analyzing Changes to the Food Chain

Each situation describes a change in a food chain environment. In complete sentences describe how the changes will affect the organisms in each food chain. Support your answers with specific details