Lesson 7 - Nitogen Cycle

Question 1

Look at the nitrogen cycle… memorise it

Question 2

Nitrogen fixation

Answer 2

chemical processes by which atmospheric nitrogen is converted into nitrates in the soil

Question 3

Purpose of nitrogen fixing bacteria

Answer 3

Found in the root nodules -convert nitrogen gas into nitrates

Question 4

Purpose of decomposers

Answer 4

break down organic matter contain nitrogen, back into nitrogen accessible in soil

Question 5

Purpose of denitrifying bacteria

Answer 5

break down nitrates into nitrogen gas, remove nitrates from soil

Question 6

Purpose of nitrifying bacteria

Answer 6

break down ammonia into nitrates, add nitrates to soil

Question 7

What do animals use for proteins for?

Answer 7

Growth or repair of tissues

Question 8

What chemical is excreted in the urine?

Answer 8

Ammonia

Question 9

What weather event fixes nitrogen gas into the soil?

Answer 9

Lightening

Question 10

Where do nitrogen-fixing bacteria live (2 places)?

Answer 10

Soil and root nodules

Question 11

What do plants use nitrates for?

Answer 11

Absorbed via root hairs to make proteins