Nitrogen Cycle Study Guide

Document Sample
Nitrogen Cycle Study Guide Powered By Docstoc
					Nitrogen Cycle Worksheet                                                                                                              Name____________________________
CA Standard 7c. Students know the movement of matter among reservoirs is driven by Earth’s internal and external sources of energy.

Answer the following questions:

1. Why do plants and animals need nitrogen (N)?

2. What molecule in the atmosphere is nitrogen normally found in?

3. What molecule in the ground is nitrogen found when there is NO oxygen around?

4. What molecule in the ground is nitrogen found when there IS oxygen?

5. What organic molecule is nitrogen found in?
                                                                                                                                                       N
                                                                                                                                      In the space below (or on the back of this sheet), draw
                                                                                                                                      your own version of the nitrogen cycle. Use arrows
6. What are 2 ways that atmospheric nitrogen gets into the ground?                                                                    to show which way the carbon is going.
                                                                                                                                      Label: Producers (plants), Nitrogen fixing bacteria,
7. What organisms (living things) do the nitrogen fixation for plants?                                                                Primary Consumers, Secondary Consumers,
                                                                                                                                      Decomposers.
8. Why don’t farmers have to put nitrogen fertilizer on soybeans?

9. Where do plants get their nitrogen from?

10. How do primary consumers get their nitrogen?

11. How do secondary consumers get their nitrogen?

12. What’s another term for primary consumer?

13. What’s another term for a secondary consumer?

14. Where does an animal’s or plant’s nitrogen go when it dies?

15. Who breaks the dead organism’s body back into inorganic nitrogen?

16. How is extra nitrogen getting into our ecosystems?

17. Why is extra nitrogen in the ocean a problem?
ANSWER KEY


1. Why do plants and animals need nitrogen (N)?TO BUILD PROTEINS

2. What molecule in the atmosphere is nitrogen normally found in? N2

3. What molecule in the ground is nitrogen found when there is NO oxygen around? NH3

4. What molecule in the ground is nitrogen found when there IS oxygen? NO3

5. What organic molecule is nitrogen found in? AMINO ACIDS, PROTEINS

6. What are 2 ways that atmospheric nitrogen gets into the ground? NITROGEN-FIXING
   BACTERIA AND LIGHTNING
                                                                                                           N
                                                                                          In the space below (or on the back of this sheet), draw
                                                                                          your own version of the nitrogen cycle. Use arrows
7. What organisms (living things) do the nitrogen fixation for plants? BACTERIA           to show which way the carbon is going.
                                                                                          Label: Producers (plants), Nitrogen fixing bacteria,
8. Why don’t farmers have to put nitrogen fertilizer on soybeans? SOYBEANS ARE LEGUMES,   Primary Consumers, Secondary Consumers,
   THEY HAVE NITROGEN-FIXING BACTERIA ON THEIR ROOTS                                      Decomposers.
9. Where do plants get their nitrogen from? THE GROUND (NO3)

10. How do primary consumers get their nitrogen? BY EATING PLANT PROTEIN

11. How do secondary consumers get their nitrogen? BY EATING ANIMAL PROTEIN

12. What’s another term for primary consumer? HERBIVORE

13. What’s another term for a secondary consumer? CARNIVORE

14. Where does an animal’s or plant’s nitrogen go when it dies? GROUND AFTER BACTERIA
   DECOMPOSE THE ORGANISM
15. Who breaks the dead organism’s body back into inorganic nitrogen? BACTERIA

16. How is extra nitrogen getting into our ecosystems? BURNING FOSSIL FUELS, EXCESS
   FERTILIZER, SEWAGE (ANIMAL OR HUMAN WASTE), DECAY
17. Why is extra nitrogen in the ocean a problem? EXTRA NITROGEN CAUSES ALGAE BLOOMS,
   THE ALGAE BLOCKS SUNLIGHT FOR PHOTOSYNTHESIS, WHEN THE ALGAE DIES,
   BACTERIA USE UP OXYGEN IN WATER (EUTROPHICATION) AND OTHER
   ORGANISMS CAN’T SURVIVE

				
DOCUMENT INFO