Ecosystems
Food Webs
Cycles
Human Impacts
100
Name four things that living organisms need to survive
Food, air (oxygen), water, shelter, heat
100
What effect does removing a predator have on an ecosystem?
Causes the prey population to increase
100
What is the biggest indicator that an ecosystem is changing?
Populations of organisms are going up or down
100
What effect does habitat loss have on populations?
Makes them go down (die off)
200
What is an ecosystem?
Living and non-living factors interacting with one another in one area
200
What is a food web?
A diagram of all living things in an ecosystem with arrows indicating which species are eating which
200
Why are decomposers needed in every ecosystem?
Because they break down dead stuff so it can be re-used
200
Name three methods for lowering our impact on the ecosystem
Variable (reusable containers, shorter showers, biking and walking, turn off lights and devices, etc)
300
Provide an example of a biotic and an abiotic factor
Biotic - anything alive
Abiotic - anything not alive
300
State the names of each step in a food chain
producer -> primary consumer -> secondary consumer -> tertiary consumer
300
When an ecosystem's cycle needs to restart after a disturbance, small plants show up followed by larger ones until the ecosystem is back to where it used to be. What do we call this?
Succession
300
When an ecosystem gets polluted and an organism at the bottom of the food chain eats the pollution, what happens to it?
The pollution will build up at the top of the food chain
400
What can you look for to determine the health of an ecosystem?
Amount and types of organisms present
400
In this food web, which organism(s) would count as primary consumers?
Krill, Herring and Scallop
400
Name three sources of carbon dioxide in the carbon cycle
Burning fossil fuels, decomposing dead stuff, breathing
400
Name three impacts humans can have on global ecosystems
Releasing greenhouse gases (climate change)
Building up excessive garbage in the ocean
Build up of pollutants in water/atmosphere
500
State how an animal in the forest would meet it's need for food, oxygen, and water (one point each)
Food -> plants, other animals, the Sun
Oxygen -> plants (trees)
Water -> rain, lakes and rivers
500
Name two effects on other populations that would occur if seals go extinct
herring/cod/dogfish go up, etc
500
Name and describe all four steps in the water cycle
step 1 -> water in the ocean evaporates
step 2 -> the water condenses into clouds
step 3 -> the water precipitates (rains) down to land
step 4 -> the water travels by rivers and lakes back to the ocean
500
State three reasons why someone would nee to look at a scientific study of an ecosystem
Variable