Science 7 notes glb lab 04b food chains and food webs
-
Upload
mrcool3 -
Category
Technology
-
view
401 -
download
2
Transcript of Science 7 notes glb lab 04b food chains and food webs
Food Chains & WebsObserving the Ecosystem
Key Objectives:
The student will:– Identify a food chain, what
makes up a food chain and how it transfers energy
Key Objectives:
The student will:– Identify how food chains
combine and interact with each other to create food webs.
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
Key Terms
Food ChainFood WebEnergy PyramidProducerPrimary
Consumer
Secondary Consumer
DecomposerHerbivoreCarnivoreOmnivore
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
Food Chain
Food Web
A matrix of interrelated food chains in an ecological community.
Food Web
Producer(s)
The green plants that use chlorophyll, water, light energy and Carbon Dioxide to create sugars.
Primary Consumers
These are called HERBIVORES, That means that they eat the green plants– Cow– Grasshopper
Secondary Consumer(s)
The first level of secondary consumers are called CARNIVORES, that means that they eat meat (other animals) for energy– Dog– Cat
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
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
Energy Pyramid
The graphical representation of the nutrition levels by which the incoming solar energy is transferred into an ecosystem.
Energy Pyramid
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
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
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
Essential Learnings
The food web is more intricate than a food chain. It shows an interrelation of food chains.
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.
Essential Learnings
When one population increases without a check, that link will eat all the food available and can eventually starve itself out.
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
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.