(a) Complete the table below.
|
Weed |
Botanical name |
Method of dispersal |
|
Goat weed |
|
|
|
Siam weed |
|
|
|
Water leaf |
|
|
(b) List three examples of each of the following factors affecting land availability for
agriculture:
(i) physical factors;
(ii) economic factors.
(c) Enumerate four effects of pollution on agricultural lands and ponds.
(d) State two ways of minimizing land and pond pollution.
Explanation
(a) Completion of table on weeds
Weed |
Botanical name |
Method of dispersal |
|
Goat weed |
Ageratum conyzoides |
Animal |
|
Siam weed |
Chromolaena odorata |
Wind |
|
Water leaf |
Talinum triangulare |
Explosive mechanism/ |
(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