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7th Grade Science Unit 7
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What is the result of decomposers breaking down dead organisms?
Nutrients are recycled and the ecosystem stays healthy
How do decomposers support the entire food chain?
By returning nutrients to the soil for plants to grow
Why aren’t decomposers usually shown in food chains?
Every organism would have an arrow pointing to them, making it too complicated
What do decomposers feed on?
Dead organisms and animal waste
Why is decay important in ecosystems?
It recycles nutrients and keeps the environment clean
What do decomposers release back into the soil?
Nutrients
What is organic matter?
Anything made by a living organism
Name two types of microorganisms that act as decomposers.
Bacteria and microscopic fungi
What are decomposers?
Organisms that cause decay by feeding on dead matter
What causes an apple to rot and decay?
Microorganisms, especially mould (fungi)
What is a food web?
A network of connected food chains showing how organisms depend on each other for food
Give an example of a simple food chain.
Sun → Plant → Animal → Human
What do arrows in a food chain represent?
The direction of energy flow
What is a food chain?
A way to show how energy moves from one living thing to another
What do we call animals that hunt and eat other animals?
Predators
What do we call animals that eat only plants?
Herbivores
What do consumers eat to get energy?
Plants or other animals
What are producers in a food chain?
Plants that make their own food using sunlight
What is the original source of energy in a food chain?
The Sun
What do we call the study of organisms and their surroundings?
Ecology
What substance provides nutrients for growing microorganisms in the lab?
Agar jelly
What dish is commonly used to grow microorganisms in a lab?
A Petri dish
What is a colony in terms of microorganisms?
A group of cells that have multiplied from a single microorganism
What do yeast feed on?
Sugar
What kind of fungus is yeast?
A single-celled fungus
Are all bacteria harmful?
No, most are harmless and some are helpful
Where can bacteria be found?
In the air, water, soil, and inside our bodies
What is the singular form of the word "bacteria"?
Bacterium
What are the four main types of microorganisms?
Bacteria, Microscopic fungi, Protozoa, Algae
What do we call organisms so small they can only be seen with a microscope?
Microorganisms
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