2 Using the quiz …Click through the quiz to see the questions and answers. Remember it is MUCH better to try to think of the answer, before clicking to read it.
3 1. Why do plants need the element nitrogen? It is needed to make amino acids which are the building blocks of proteinsAnswerNextquestion
4 2. In what form is nitrogen absorbed into a plant? It is converted into nitrates and this enters the plant via its rootsAnswerNextquestion
5 3. What is the original source of this nitrogen? The nitrogen comes from the airAnswerNextquestion
6 It is fixed by lightning 4. What weather condition "fixes" nitrogen - ie changes it from the element into a nitrate?It is fixed by lightningAnswerNextquestion
7 5. What two roles do bacteria play in fixing nitrogen? Bacteria in the soil fix nitrogen and other bacteria build it up into nodules on the roots of some plantsAnswerNextquestion
8 (the main compound in urine) 6. Name one compound excreted by animals which returns nitrogen to the soilUrea(the main compound in urine)AnswerNextquestion
9 By decay of its faeces (faeces is the correct term for droppings) 7. How else is nitrogen returned to the soil during an animal's lifetime?By decay of its faeces (faeces is the correct term for droppings)AnswerNextquestion
10 8. When an animal or plant dies and decays, what chemical is released into the soil? Ammonia is releasedAnswerNextquestion
11 9. What happens next to the ammonia - and what makes this happen? Ammonia is changed into nitrates : this is done by nitrifying bacteriaAnswerNextquestion
12 10. What is the role of denitrifying bacteria? Denitrifying bacteria change useful nitrates back into nitrogen which is then returned to the air (and cannot be used by the plant)AnswerNextquestion
13 11. What type of soil condition favours denitrifying bacteria? They are more plentiful in water-logged soils ; so these are NOT good for plant growth because they do not have enough nitrogen left in themAnswerNextquestion
14 12. How is the nitrate level of soils artificially increased? We add fertilisers which are nitrate compoundsAnswerNextquestion
15 That was the last question. I hope you got all the answers correct ! Try againExit quiz
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