Science 10 Nitrogen Cycle Worksheet Name:__________________________ Blk:____

Go to the following website to answer the questions below:

http://fc.deltasd.bc.ca/~mannandale/sc10/EP_nitrogen_cycle.swf

1. Fill out all the missing information on the Nitrogen Cycle diagram provided.

2. Using your nitrogen cycle diagram, answer the following questions:

a. What is the main form of nitrogen in the atmosphere?

b. Nitrogen fixation in fertilizer manufacturing converts N2 into what other two forms?

c. What form of nitrogen does nitrogen-fixing bacteria converts N2 into?

d. Nitrifying bacteria convert NH4+ into ____________ and then into ________________.

e. What form of nitrogen compound is used by plants? (uptake by plants)

f. What is the name of the process by which nitrates (NO3-) are converted back into N2 and

returned to the atmosphere?

3. Each time you click on one of the grey buttons on the right side of the Interactive Nitrogen

Cycle, the fact in the black bar at the bottom of the page changes. Read all of the facts and write

down the four that you found most interesting below:

a.

b.

c.

d.

Science 10 Phosphate Cycle Worksheet Name:__________________________ Blk:____

Go to the following website to answer the questions below:

http://fc.deltasd.bc.ca/~mannandale/sc10/hw/EP_phosphorus_cycle.swf

1. Fill out all the missing information on the Phosphate Cycle diagram provided.

2. Using your phosphate cycle diagram, answer the following questions:

a. What are the two most abundant phosphate stores? How many megatonnes is stored in

each?

b. How much mineable phosphate is there? (in megatonnes)

c. Describe two ways that phosphate could move from the deep stores in the Earth’s crust and

ocean sediments and get into soils so that it is available for uptake by plants (terrestrial

organisms)?

3. Each time you click on one of the grey buttons on the right side of the Interactive Phosphate

Cycle, the fact in the black bar at the bottom of the page changes. Read all of the facts and write

down the four that you found most interesting below:

a.

b.

c.

d.

DATE: NAME: CLASS:

CHAPTER 2 BLM 1-22

Questions about the Nitrogen Cycle

Copyright © 2008, McGraw-Hill Ryerson Limited, a subsidiary of the McGraw-Hill Companies. All rights reserved.

This page may be reproduced for classroom use by the purchaser of this book without the written permission of the publisher.

Goal • Use this page to record information about the nitrogen cycle.

What to Do

Read the following questions. Complete the answers as you read pages 78–83 in your student book. Points to Know

Why is nitrogen necessary for living organisms?

How is nitrogen stored?

How is nitrogen cycled through the ecosystem?

What is nitrogen fixation?

What is nitrification and uptake?

How does nitrogen return to the atmosphere?

How is excess nitrogen removed from ecosystems?

How do human activities affect the ecosystem?

DATE: NAME: CLASS:

CHAPTER 2 BLM 1-23

Know Your Nitrogen

Copyright © 2008, McGraw-Hill Ryerson Limited, a subsidiary of the McGraw-Hill Companies. All rights reserved.

This page may be reproduced for classroom use by the purchaser of this book without the written permission of the publisher.

Goal • Use this page to learn terms about nitrogen.

What to Do

Cut out the terms on the left, pair each with the correct definition on the right, and paste them together on another sheet. Or make flash cards by pasting the definition to the back of the term.

Terms Definitions

Nitrogen fixation The process of making nitrates

Denitrification Provide nitrogen for the host plant and in return obtain sugars

Nitrifying bacteria Certain bacteria that convert nitrate back into nitrogen gas

Nitrate NO2–

Nitrogen uptake Nitrogen gas is converted into nitrate using electrical energy from lightning.

Nitrification The process where nitrates are converted into nitrogen gas

Ammonium N2

Denitrifying bacteria The process where nitrates enter plant roots

Nitrite NH4+

Nitrogen-fixing bacteria Certain bacteria that convert ammonium into nitrite or nitrite into nitrate

Nitrogen NO3–