Nitrogen cycle gcse biology

Question 1

Nitrogen

Answer 1

Gas

Question 2

Nitrogen cycle

Answer 2

Atmosphere, Bacteria, Plant, Animal, Feces, Bacteria, Atmosphere

Question 3

Atmosphere

Answer 3

Layers of gases that surround the earth

Question 4

nitrogen fixing bacteria

Answer 4

Bacteria that can combine nitrogen with other elements so the nitrogen can be used by plants.

Question 5

legumes

Answer 5

Plants (clover, soy, peanuts etc.) that have little nodules (bumps) on their roots to house nitrogen fixing bacteria. It’s a symbiotic relationship - legumes provide the home, bacteria provide usable nitrogen to the plant

Question 6

denitrification

Answer 6

When bacteria change fixed nitrogen back into gaseous nitrogen (N2) which goes back to the atmosphere.

Question 7

acid rain

Answer 7

rainfall contaminated by high concentrations of sulfur dioxide and nitrogen oxides.

Question 8

Bacteria

Answer 8

large group of one-celled organisms. Some types of bacteria help in the process of nitrogen fixation.

Question 9

Nitrification

Answer 9

the process by which nitrites and nitrates are produced by bacteria in the soil