(a) Complete the table below. Weed Botanical name Method of dispersal Goat weed Siam weed...
(a) Complete the table below.
Weed | Botanical name | Method of dispersal |
Goat weed | ||
Siam weed | ||
Water leaf |
(b) Listthree examples ofeach of the following factors affecting land availability for
agriculture:
(i) physical factors;
(ii) economic factors.
(c) Enumeratefour effects of pollution on agricultural lands and ponds.
(d) Statetwo 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 Wind |
Siam weed | Chromolaena odorata | Wind |
Water leaf | Talinum triangulare | Explosive mechanism/ self explosion |
(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 - Contami