Science 7 notes glb lab 04b food chains and food webs
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Transcript of Science 7 notes glb lab 04b food chains and food webs
![Page 1: Science 7 notes glb lab 04b food chains and food webs](https://reader036.fdocuments.us/reader036/viewer/2022062405/55622b03d8b42ad44d8b559e/html5/thumbnails/1.jpg)
Food Chains & WebsObserving the Ecosystem
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Key Objectives:
The student will:– Identify a food chain, what
makes up a food chain and how it transfers energy
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Key Objectives:
The student will:– Identify how food chains
combine and interact with each other to create food webs.
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Key Objectives:
The student will:– Describe a simple food chain and
food web– Share the effects and
consequences if one link of strand of a food chain or food web disappears
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Key Terms
Food ChainFood WebEnergy PyramidProducerPrimary
Consumer
Secondary Consumer
DecomposerHerbivoreCarnivoreOmnivore
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Food Chain
The food chain is a straight line structure or linear model that shows how each living thing gets its food.
It begins at the lowest level and works to the highest levels
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Food Chain
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Food Web
A matrix of interrelated food chains in an ecological community.
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Food Web
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Producer(s)
The green plants that use chlorophyll, water, light energy and Carbon Dioxide to create sugars.
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Primary Consumers
These are called HERBIVORES, That means that they eat the green plants– Cow– Grasshopper
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Secondary Consumer(s)
The first level of secondary consumers are called CARNIVORES, that means that they eat meat (other animals) for energy– Dog– Cat
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Secondary Consumer
The second level of secondary consumers are called OMNIVORES, that means that they eat meat (plants and other animals) for energy– Grizzly Bear– Human
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Decomposer(s)
This part of the food chain consists of fungi and microbes that break down the dead secondary consumers returning the nutrients to the soil
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Energy Pyramid
The graphical representation of the nutrition levels by which the incoming solar energy is transferred into an ecosystem.
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Energy Pyramid
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Lab Time
Now it is time to introduce the new lab.
Please open your Green lab guides to pages50 and 51
Read the introduction silently as I read it aloud
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Essential Learnings
The food chain begins with producers followed by the primary then secondary and third-level consumers and finally decomposers return nutrients to the earth
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Essential Learnings
When one link of a food chain is removed, unless another source of food is found, the results are catastrophic down the chain and a species could become extinct
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Essential Learnings
The food web is more intricate than a food chain. It shows an interrelation of food chains.
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Essential Learnings
When one link of a food chain is broken or the population disappears, the link below it explodes in population while the link above it declines.
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Essential Learnings
When one population increases without a check, that link will eat all the food available and can eventually starve itself out.
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Essential Learnings
The food chain/web is a delicate cycle of life. If it is permanently disturbed/disrupted it could change life on earth forever
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Essential Learnings
Humans have a responsibility to keep the earth going for further generations of beings, animals and plants.
We need to protect our environment so not to disrupt the delicate circle of life.