The Nitrogen Cycle

Question 1

How much nitrogen does the atmosphere contain

Answer 1

78%

Question 2

Why is nitrogen needed

Answer 2

For making proteins for growth

Question 3

How do plants get nitrogen

Answer 3

From the soil, so nitrogen in air has to be turned to NITROGEN COMPOUNDS before plants can use it.

Question 4

How do animals get nitrogen?

Answer 4

By eating plants or each other

Question 5

What is Nitrogen fixation

Answer 5

Process of turning N2 from air into nitrogen compounds in soil for plants to use.

Question 6

What are the two ways nitrogen fixation can happen?

Answer 6

LIGHTNING
- so much energy in it so nitrogen reacts with oxygen in air to give NITRATES

NITROGEN - FIXING BACTERIA

Question 7

What are the kinds of bacteria involved in the nitrogen cycle?

Answer 7

1. DECOMPOSERS
2. NITRIFYING BACTERIA
3. NITROGEN-FIXING BACTERIA
4. DENITRIFYING BACTERIA

Question 8

What do decomposers do?

Answer 8

Break down proteins and urea and turn them into ammonia forming AMMONIUM IONS sun soil

Question 9

What does nitrifying bacteria do?

Answer 9

Turn ammonium ions in decaying matter into NITRATES (nitrification)

Question 10

What do Nitrogen fixing bacteria do?

Answer 10

Turn Atmospheric N2 into NITROGEN COMPOUNDS for plants to use

Question 11

What do denitrifying bacteria do?

Answer 11

Turn nitrates back into N2 gas

Question 12

Draw out the nitrogen cycle visually

Answer 12