Complete the table below.             Weed Botanical name Method of dispersal Goat weed    …

Explanation

(a) Completion of table on weeds

(b)  Factors affecting land availability for agriculture
(i)  Physical factors  
–   Soil type                                               –   Topography
–   Land degradation                                 –   Soil pollution
–   Soil fertility                                            
–   Soil properties such as texture and structure                                                                                                                                                                                                                                       
(ii) Economic factors
–   Population pressure/housing               –   Expansion of industries
–   Mining/mineral exploitation                 –   Recreation/tourism
–   Transportation                                    –   Construction of markets
(c)  Effects of pollution on agricultural lands and ponds
–   Death of aquatic organisms                         –   Contamination of crops
–   Loss of income/investment                          –   Contamination of water
–   Disruption of ecological balance                 –   May increase cost of production
–   Crop failure/death
(d)  Ways of minimizing land and pond pollution
–   Controlled application of herbicides            –   Proper disposal of sewage
–   Controlled application of fertilizers              –   Proper disposal of animal wastes
–   Controlled application of pesticides            –   Fencing of ponds
–   Proper maintenance of oil pipelines to prevent spillag

–   Adoption of organic farming