(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.
(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
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