1. What goes around comes around
Cycles in Nature
What goes around comes around

2. Water Cycle
Liquid water returns to the atmosphere through evaporation and transpiration.
Condensation is when water vapor becomes liquid again and returns to Earth from preciptation

4. When water returns to the ground from the atmosphere, it is called
A: Evaporation
B: Condensation
C: Precipitation
D: Transpiration
E: All of the above are involved in water leaving the atmosphere

5. Nitrogen Cycle Needed for plants to build cells
Cycled through air by nitrogen fixing bacteria
Returned to soil from animal waste, animals dying

7. The most important aspect of the nitrogen cycle is:
A: Provides fresh nitrogen for the air
B: Without it plants would not be able to grow
C: Helps with the water cycle
D: Animals need nitrogen to eat
E: All of the above

8. Carbon Cycle Carbon dioxide cycles through plants and animals
Plants use CO2 in photosynthesis and give off O2
Animals use O2 and give off CO2
Reduction of plants, and increased pollution increases carbon in the atmosphere (global warming)

10. The carbon cycle is important because:
A: Plants need it do photosynthesis
B: Animals need the carbon cycle for breathing
C: Global warming is affected by the amount of carbon in the atmosphere
D: Plants and animals use each other’s products
E: All of the above are part of the carbopn cycle

11. Energy Flow All energy in an ecosystem comes from the sun
Plants convert light energy into sugar by photosynthesis
Food chains show how this energy is passed on to other organisms

13. Energy is constantly added to the Earth from the sun, without that,
A: The energy that is already here would be passed around
B: We would have to use energy from electricity
C: Plants would die, animals would be fine
D: All life would die off eventually
E: None of the above would happen

14. Energy pyramids
An energy pyramid shows the amount of energy available at each level
Only about 10% of energy from each level is passed on

15. If only 10% of energy is passed on in an energy pyramid, where does the rest go
A: It is lost in the form of heat
B: It is left behind in the form of undigestable remains
C: It is used by organisms to carry on their life processes
D: It is used for plants to grow
E: All of the above

16. Ecological Succession
Gradual changes that occur after a disturbance
Primary Succession: Pioneer species are the first to arrive, make it possible for others
Secondary Succession: Already habitable area
Climax Community: End of succession

17. What needs to happen before palm trees can grow on a volcanic island (like Hawaii)?
A: pioneer species needs to start living there first
B: Soil needs to be formed by rocks breaking down
C: Plant seeds need to be brought to the island
D: Organic matter dies and is added to the soil
E: All of the above

18. Which of the following is not considered a disturbance?
A: Fire
B Volcano
C: Tornado
D: Glacier
E: All of the above are disturbances

19. Permafrost would be in which biome?
A: Grasslands
B: Deserts
C: Rainforests
D: Tundra
E: All of the above