(a) Define an insecticide (b) List four groups of insecticides. (c) For each of the following pests, name the class of pesticide used for their control: (i)...
Question 1 Report
(a) Define an insecticide (b) List four groups of insecticides. (c) For each of the following pests, name the class of pesticide used for their control: (i) grasshoppers (ii) rats (iii) weaver birds (iv) eelworms (d) Enumerate two effects of each of the following pest control measures on the environment: (i) chemical (ii) cultural (iii) biological
Answer Details
(a) Definition of an insecticide: An insecticide is a chemical substance (a type of pesticide) used to kill or control insect pests on crops, animals or stored produce.
(b) Four groups of insecticides:
- Contact insecticides
- Systemic insecticides
- Stomach-poison (ingested) insecticides
- Fumigants
(c) Class of pesticide used for each pest:
| Pest | Class of pesticide |
|---|---|
| (i) Grasshoppers | Insecticide |
| (ii) Rats | Rodenticide |
| (iii) Weaver birds | Avicide |
| (iv) Eelworms | Nematicide |
(d) Two effects of each pest-control measure on the environment:
(i) Chemical control:
- It pollutes the soil, water and air with toxic residues.
- It kills useful, non-target organisms such as bees, natural enemies and soil organisms, and residues can harm human health.
(ii) Cultural control:
- It is environmentally friendly and leaves no toxic residues.
- Practices such as bush burning, however, can destroy soil organisms and expose the soil to erosion.
(iii) Biological control:
- It maintains ecological balance and does not pollute the environment.
- An introduced predator or parasite may become a pest itself and upset the natural balance if not well controlled.
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