(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 factor...
Question 1 Report
(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.
Answer Details
(a) Completed weed table:
| Weed | Botanical name | Method of dispersal |
|---|---|---|
| Goat weed | Ageratum conyzoides | Wind |
| Siam weed | Chromolaena odorata | Wind |
| Water leaf | Talinum triangulare | Explosive mechanism (self-dispersal of the ripe capsule) |
(b) Factors affecting land availability for agriculture:
(i) Physical factors:
- Relief (topography) of the land.
- Climate (rainfall and temperature).
- Soil type and fertility.
(ii) Economic factors:
- The land tenure system.
- Availability of capital and the cost of land.
- Access to markets and transport (and government policy).
(c) Four effects of pollution on agricultural lands and ponds:
- It kills beneficial soil organisms and reduces soil fertility.
- It contaminates the soil and water with toxic chemicals.
- It kills fish and other aquatic life through oxygen depletion (eutrophication).
- Toxins build up in crops and fish, making them harmful to consumers.
(d) Two ways of minimizing land and pond pollution:
- Treat and properly dispose of industrial and domestic waste before it is discharged.
- Use agrochemicals (fertilizers and pesticides) judiciously and only at recommended rates.
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