(a) Give one function of each of the following bacteria in Nitrogen cycle:
ii Rhizobium
ii Nitrosomonas
iii Pseudomonas
iv Nitrobacter
(b) A farmer discovered that aphids have invaded a cowpea farm.
(ii) State three effects of aphids on the cowpea plants.
c(i) Explain the term forestry.
(ii) Name five products that could be obtained from forests.
(i) Rhizobium
Fixation of nitrogen in the root noddles of leguminous crops
(ii) Nitrosomonas
Oxidation of ammonium compounds to nitrites ( NO-2)
(iii) Pseudomonas
Reduction of soil nitrates to gaseous nitrogen/dentification
(iv) Nitrobacter
Oxidation of nitrites to nitrates (NO-3)
b(i) Effects of aphids on Cowpea plants
Reduces the yield
Reduces the yield of seeds
Reduces the germination of seeds
Serves as vectors of diseases
May result in death of plants
(ii) Cultural ways by which the farmer could control aphids on the Cowpea farm
Planting of resistant varieties
Planting of insect-free seeds
Practicing crop rotation
Inter-planting of crops
Completion of the table
c(i) Explanation of forestry
Forestry is the study and management of forests and forest resources
Forestry is the art and science of managing trees,forests and forests products for human use.
(ii) Products that could be obtained from the forest:
-Bush meat,Timber wood,fuel,wood/firewood,wood pulp,honey,snail,mushroom,chewing stick.
-Palm wine,Palmoil,Kolanut,wild fruits,bamboo,gum,latex.
-Medicinal herbs,dye,wild vegetables,fiber,resin,bush yam.
-Long pole,wax,wild space.
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