Ok for the nitrogen cycle: have these points...
Nitrogen enters by lightning when oxygen and nitrogen molecules combone to form nitrates
Nitrogen enters also by nitrogen fixing in the soil convert nitrogen to nitrates
Nitrates enter the soil by decomposition and excretion
Plants take up nitrogen from the soil by their roots such as nitrates and turn it into protein for growth.
Nitrogen leaves by denitrifying bacteria which converts nitrates to nitrogen.
Hope this helps :wink:

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Reply 118

Usmaan345

2

Original post by Ella_08

Ok for the nitrogen cycle: have these points...
Nitrogen enters by lightning when oxygen and nitrogen molecules combone to form nitrates
Nitrogen enters also by nitrogen fixing in the soil convert nitrogen to nitrates
Nitrates enter the soil by decomposition and excretion
Plants take up nitrogen from the soil by their roots such as nitrates and turn it into protein for growth.
Nitrogen leaves by denitrifying bacteria which converts nitrates to nitrogen.
Hope this helps :wink:

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Thanks can you also help me with the carbon cycle please

Reply 119

username1454260

17

Original post by Usmaan345

Thanks can you also help me with the carbon cycle please

Carbon is an essential compound
It is recycled through the carbon cycle
It enters as co2
Plants fix it to carbon so it can be stored by photosynthesis
It's returned by respiration when plants release energy
Returned by combustio
Returned by decomposition of dead stuff and make sure u say microorganism or bacteria decompose it

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17th May 2016- OCR 21st Century Science B1 B2 B3 Exam

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