The diagram below represents the nitrogen cycle.
(a) State the process labeled: A and D
(b) Name the compound represented by B.
(c) Name the group of organisms labeled C.
(d) (i) Name the group of plants which promote process A.
(ii) State the part of the plant where process A takes place.
(e) How would excess pesticides in the soil interfere with process A?
Answer:
a)
A
- Nitrogen fixation by symbiotic bacteria e.g Rhizobium
D
- Absorption
b)
- Nitrates
c)
- Denitrifying bacteria/denitrifiers
d)
i) Leguminous plants (or legume) e.g beans, peas
ii) Roots nodules
e)
-By killing/ reduction of nitrogen fixing bacteria/ nitrogen fixing micro-organisms e.g Rhizobium.
-By destruction of leguminous plants.
A
- Nitrogen fixation by symbiotic bacteria e.g Rhizobium
D
- Absorption
b)
- Nitrates
c)
- Denitrifying bacteria/denitrifiers
d)
i) Leguminous plants (or legume) e.g beans, peas
ii) Roots nodules
e)
-By killing/ reduction of nitrogen fixing bacteria/ nitrogen fixing micro-organisms e.g Rhizobium.
-By destruction of leguminous plants.
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