Cycles in Nature

Question 1

In the nitrogen cycle, what bacteria is involved in decomposition?

Answer 1

Decomposing bacteria

Question 2

In the nitrogen cycle, what bacteria is involved in nitrification?

Answer 2

Nitrifying bacteria

Question 3

In the nitrogen cycle, what bacteria is involved in denitrification?

Answer 3

Denitrifying bacteria

Question 4

In the nitrogen cycle, what bacteria is involved in nitrogen fixation?

Answer 4

Nitrogen fixing bacteria

Question 5

When does nitrification occur in the nitrogen cycle?

Answer 5

When ammonia is converted to nitrates

Question 6

Describe decomposition in the nitrogen cycle

Answer 6

• protein in dead plants + animals is broken down

- ammonia is released into the soil

Question 7

Describe denitrifying in the nitrogen cycle

Answer 7

• nitrates converted to nitrogen gas

- reduces amount of nitrates in soil .˙. soil is less fertile

Question 8

Describe nitrogen fixation in the nitrogen cycle

Answer 8

• N2 converted to ammonia in bacteria, used to make proteins
• when bacteria die, protein decomposes
• releases ammonia back into the soil

Question 9

Where do nitrogen fixing bacteria live?

Answer 9

Small structures on the roots of leguminous plants

Question 10

What happens when nitrogen fixing bacteria decompose?

Answer 10

Make soil more fertile by releasing ammonia which can be converted to nitrates