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2018 WAEC Biology Theory (a). Explain briefly the following terms: (i) Renewable natural resources (ii) Non -renewable natural resources; ...

Biology
WAEC 2018

(a). Explain briefly the following terms:
(i) Renewable natural resources
(ii) Non -renewable natural resources; 

(b) Give two examples each of:
(i) Renewable natural resources
(ii) Non -renewable natural resources

(c) State five ways of conserving forests

(d) State four effects of adding animal manure to garden soil.

(e) Give the possible genotypes in humans; 

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Explanation

(a) (i) Renewable natural resources  
Materials that can be reused/replaced/ regenerated/recycled; after they have been used 

(ii) Non-renewable natural resources  
Materials that are difficult/impossible to regenerate/ recycled; after being exhausted/depleted. 

(b) (i) Renewable natural resources
 Air; soil; crops; fisheries; water; vegetation/forest; game/wildlife. 
(ii) Non-Renewable natural resources  Rocks; coal; minerals/correctly named example; crude oil/petroleum. 

(c) Ways of conserving forest

  • Prevent forest/bush fires
  • Practice selective cutting of trees/avoid indiscriminate felling of trees
  • Regulations/laws to control excessive clearing of forest
  • Employ forest guards to prevent/arrest intruders
  • Use pesticides to kill pests/control plant diseases
  • Embark on public education on dangers of deforestation. 

(d) Effects of adding animal manure to garden soil  

  • Animal manure provides nutrients/nitrogenous materials /improves soil fertility 
  • Animal manure are acted upon by nitrifying bacteria
  • To form nitrates for plants
  • Manure improves the water-holding properties of the soil by binding the soil particles together/ improves soil structure
  • Prevents soil from being blown away by wind/erosion 

(e) Possible genotypes in humans
AA, AS, SS 
 


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