K.C.S.E Biology Q & A - MODEL 2001PP1QN13

K.C.S.E Biology Q & A - MODEL 2001PP1QN13

The diagram below represents the nitrogen cycle

(a) State the process labeled
A
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

answers

​(a) A – Nitrogen fixation
     D – absorption
(b) Nitrate/ nitrates/ NO2
(c) Denitrifying bacteria/ Denitrifiers
(d) (i) Leguminous plants, (acc. Legume/ acc examples e.g beans peas)
(ii) Roots nodules; rej root or nodules alone; acc; root 
(e) – Killing / reducing of composers
      - Killing/reduction of nitrogen fixing bacteria/ nitrogen fixing microorganisms
      - Destruction of leguminous plants