The nitrogen cycle SB9

Question 1

what % of the atmosphere is nitrogen?

Answer 1

80%

Question 1

how much of the body is composed of nitrogen?

Answer 1

3%

Question 2

what type of gas is nitrogen?

Answer 2

unreactive

Question 3

where do plants contan nitrogen compounds?

Answer 3

Proteins and DNA

Question 4

what do plants need to grow well?

Answer 4

nitrogen to make more proteins and DNA

Question 5

how do plants take in nitrogen?

Answer 5

absorb nitrates that are dissolved in soil water

Question 6

how is soil fertility maintained?

Answer 6

by decomposers like bacteria in the soil

Question 7

how do decomposers work?

Answer 7

they release nitrogen compounds together with carbon compounds when they decompose organisms and their waste

Question 8

how do farmers use the decay process?

Answer 8

when they add manue to feilds and spread artificial fertilisers to increase soil fertility

Question 9

how do fertilisers mainatin soil fertility?

Answer 9

they have nitrogen compounds which are soluble and dissolve in soil water

Question 10

what are nitrogen-fixing bacteria?

Answer 10

soil bacteria that can convert nitrogen gas into nitrogen compounds in the soil