

Ecosystems - Food Chains & Food Webs (KS3)
Presentation
•
Biology
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6th - 8th Grade
•
Hard
Joseph Davids
Used 29+ times
FREE Resource
10 Slides • 0 Questions
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DO NOW TASK
What do you think the arrows represent in this image opposite?
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UNDERSTANDING FOOD WEBS
LEARNING OBJECTIVES
- Describe how food webs are made up of a number of food chains.
- Make predictions about factors affecting plant and animal populations.
- Analyse and evaluate changes in a food web.
KEY WORDS
food chain
population
food web
producer
consumer
decomposer
trophic level
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What is an Ecosystem?
"A community of interacting organisms + their physical environment."
examples; area of a desert or a lake or even your skin.
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A Food Chain
The organisms in a food chain are dependent on each other
How would you list this food chain?
Another could be "grass - grasshopper - frog - snake - hawk" (you MIGHT add "fungi" to be complete).
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Food Chains + Food Webs
Food Webs show all the Food Chains together within a specific ecosystem.
Q1. Please name me a Producer from this Food Web
Q2. Which Consumers feed on Fruit Flies?
Q3. Please give me one complete food chain.
Q4. What could be the impact if lots of Frogs died because of some illness?
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Trophic Levels
We can organise the organisms into Trophic Levels.
The word Trophic is to do with food, eating, or nutrition.
The organism on the level above EATS the organism on the level below.
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Trophic Levels
Level 1 is always a PRODUCER - an organism that gets its energy from the Sun via photosynthesis.
All the other levels are CONSUMERS
Not all the energy flows up to the next level because each CONSUMER has to "waste" energy to find a meal
10
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