Correct Answer: D. pipes

Correct Answer: B. sida acuta

Correct Answer: C. long legs

Correct Answer: D. telescope

Explanation

(a) Insecticide: An insecticide is defined as a chemical preparation used to control insect pests.

(b) Group of insecticides: (i) Powder (ii) Liquid (iii) Granules (iv) Tablets (v) Aerosol

(c) Class of Pesticide that Kills Specific Insect Pests:

(d)(i) Effects of Chemical Control on the Environment: (i) Beneficial organism insects like earthworms, bees may be destroyed. (ii) Some chemicals may be toxic to man, domestic animals and plants. (iii) It may lead to pollution of the environment. (iv) It destroys aquatic life.

(ii) Effects of Cultural Control on the Environment: (i) Fire that kills harmful insects may also kill beneficial insects. (ii) Bush burning spreads within a twinkle of an eye to other places and causing excessive damage to structures, crops and animals. (iii) Fire destroys organic matter in the soil. (iv) Tillage operation destroys soil structure and causes erosion.

(d)(iii) Effects of Biological Control on the Environment: (i) Natural enemy (organism) introduced to control pest may abandon the pest and start to attack other crops in the environment originally free from attack. (ii) Predators may feed on other beneficial insects other than the ones intended to control. (iii) Newly introduced organism may cause imbalance in the ecosystem. (iv) Breeding for increased yield may alter genetic resistance of crops to pest and diseases thereby leading to increased pest/disease population in the environment.

Correct Answer: D. mechanical power

Correct Answer: D. copulation,gestation,parturition and lactation

Explanation

(a) Farmstead: This can be defined as farm house and all production and processing structures.

(b) Factors to Consider in Planning a Farmstead: (i) Topography (ii) Soil type (iii) Accessibility (iv) Health/Hygiene (v) Water supply (vi) Nearness to market (vii) Drainage.

(c) Importance of: Topography: (i) Living quarters should be located on the highest elevation - to provide good view of the farm. (ii)Animal quarters to be located far from the living quarters. (iii) Locate crops such as vegetables on low lying areas where moisture content is high. (iv) Fish ponds are located on slopy grounds. (v) Irrigation farms are best sited on flat grounds. Soil Type: (i) Crop farms are sited on soils that are fertile. (ii) Pastures on less fertile soils. (iii) Farm building and structures are best located on poor soils. (iv) Farrn roads are best constructed on well drained poor soil.

Accessibility: (i) Locate facilities within walking distance. (ii) To facilitate the transportation of farm inputs. (iii) For evacuation of farm produce. (iv) Good accessibility makes marketing of farm produce possible.

Water Supply: (i) Adequate water supply is needed for human and animal use. (ii) Livestock structures are located close to source of water supply for easy cleaning. (iii) Water is required for irrigation purposes.

Health/Hygiene: (i) Erect livestock units against wind direction. (ii) Locate animal units far away from the dwelling houses to avoid health hazards.

Nearess to Market: (i) Reduces distribution/transport cost. (ii) Exposes products to many buyers. (iii) Reduces the need for farm storage facilities.

Drainage (i) Adequate drainage is important to avoid water logging. (ii) Gentle slope facilitates proper drainage. (iii) Good drainage makes movement easier within the farm.

(d) Reasons for Planning Farmstead: (i) Allows for proper utilisation of resources without wastage. (ii) Makes the farmer to be more responsive to market demand. (iii) Encourages efficiency of farm activities. (iv) It makes coordination and control of farm operations easier.

Correct Answer: B. remove adhering soil from the disc

Correct Answer: C. parturition