This is the number of variables that a scientist can CHANGE or MANIPULATE in a controlled experiment.
What is ONE
100
The fish and the crickets are _______________.
What is a consumer?
100
ALL food chains and food webs start with _____________, which gives energy to ______________ to make their own food.
What is the sun?
which gives energy to producers.
200
What is the energy source for the fish?
Elodea or duckweed
200
What is the energy source for the cricket?
What is grass?
200
I can always find the changed variable and the measured variable in the __________________.
What is question?
200
The fish and the elodea: do they have a dependent, or interdependent relationship? Tell why.
Interdependent, because the fish depends on the elodea for food and shelter, and the elodea depends on the fish for carbon dioxide and waste nutrients.
200
Road salt, fertilizer, and acid rain are types of ___________.
What are pollutants.
300
put these items in the correct food chain order: grasshopper, hawk, grass, sun, snake, frog
Then tell which way the arrows go to show the flow of energy in the food chain.
The frog is an example of a ____________ because it eats other organisms for energy.
What is a consumer?
300
What is the effect of the amount of light on the number of fish that live?
Identify which is the measured variable, and which is the changed variable.
changed: amount of light
measured: number of fish that live
300
This type of consumer eats leftover dead matter. An example would be a _____________.
What is a scavenger?
isopod, snail, wolverine
300
a CHANGED (or manipulated) variable is called a CHANGED variable because it is the ONE and ONLY thing that the scientist can ____________
What is CHANGE?
400
The elodea is a ___________ because _____________
What is a producer, because it makes it's own food.
400
Explain why the grass and the sun is NOT an interdependent relationship.
Because the grass depends on the sun to make its own food, but the sun does not need the grass, it will keep on shining!
400
What is the effect of the amount of light on the number of fish that live?
What would be 3 variables that the scientist would have to keep the same, or control?
same type and number of fish to start
same water
same aquarium set up (gravel, water amount)
same food
400
This group breaks down dead matter and returns nutrients to the soil.
What is a decomposer?
400
A diagram that shows who eats what, and the flow of energy from one thing to another is called a _____ ______.
What is food chain or food web?
500
Describe 2 ways a food chain could be affected if there were a large increase in the number of hawks.
1. There would be fewer snakes or mice.
2. There would be more grasshoppers or crickets
3. There would be little or no grass
500
Describe 2 ways the food chain could be affected if there were a large decrease in the number of sea otters.
1. There would be too many sea urchins
2. There would be little or no kelp
3. Other consumers that eat kelp wouldn't have food.
4. Sea urchins wouldn't have enough to eat because they eat all of the kelp.
500
Controlled science experiment procedures start each numbered step with this kind of action word.
What is a VERB?
500
Give an example of a decomposer.
Mushroom/Fungus
Worms
Bacteria
500
CONTROLLED variables are all of the variables that the scientist has to control, or keep the same; otherwise, the experiment would not be __________