(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;
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
