Correct Answer: C. has unlimited liability in case of business failure

Correct Answer: D. the slip rings should be replaced with split rings

Explanation

An AC generator uses slip rings to transfer the induced current smoothly to the circuit. A DC generator uses split rings to transfer the induced current to the circuit and also convert the induced AC into pulsating DC. So, to convert an AC generator into a DC generator, the slip rings needs to be replaced with split rings.

Correct Answer: B. still determined and hopeful

Explanation

(a)Sources of irrigation water

- Rivers

- Lakes - Streams

- Ponds -

- Bore-holes

- Wells

- Reservoirs

- Springs

- Brooks

- Dams

(b) Advantages and disadvantages of irrigating farmlands

Advantages

- Makes early planting possible

- Adds water to the soil/supply moisture to the soil for plant growth

- Helps to soften the soil for easy tillage operations

- Facilitates the survival of crops during drought

- Farmers become less dependent on rainfall

- Helps lower soil temperature

- Ensures all-year-round production

- Modifies both soil and plant environment

- Enhances microbial decomposition of organic matter in the soil

- Dissolves nutrients for root absorption

- Can be used to apply liquid fertilizers(fertigation)

Disadvantages

- High cost of irrigation equipment

- Increased salinity

- Disease transmission is possible

- Leads to build-up and spread of pests

- Vectors of diseases e.g. snails, tsetse flies, mosquitoes may breed in

irrigated areas

- Movement of farm machinery may be hindered

- May lead to leaching

- May lead to erosion/flooding

- Encourages the growth and spread of weeds

(c) Ways by which the soil loses nutrients

- Mechanical land clearing/bulldozing of virgin forests

- Crop removal/harvesting

- Continuous cropping

- Leaching

- Burning

- Overgrazing

- Erosion

- Oxidation

- reduction

- Chelation

(d) Reasons for manuring in crop production

- Improves the activities of soil organisms like earthworms

- Improves the structure of the soil

- Improves aeration within the soil

- Regulates soil temperature

- Buffering effects improve the acid-base reaction of the soil/assists in regulating soil pH

- Improves water holding capacity in sandy soil

- Improves water infiltration in clay soil

- Controls soil erosion

- Adds nutrients to the soil/improves soil fertility

- Increases cat ion exchange capacity of the soil

- Used for the control of nematodes in the soil

(e) Ways by which environmental factors affect agricultural production

(i) Temperature

- High temperature may cause heat stress/death of farm animals

- A necessary condition for germination of seeds

- Affects distribution of crops

- Affects distribution of animals

- High temperature increases evapo-transpiration

- High temperature reduces the performance of livestock/fish

- Temperature affects the ripening and maturity of fruits

- Affects microbial activities in relation to mineralization of organicsubstances

- Temperature affects productivity of human labour/draught animal

(ii) Soil micro-organisms

- Cause diseases in plants

- Bacteria in root nodules can fix nitrogen directly to plants and soils

- Reduce the quantity and quality of crops e.g. potato, yam

- Help in the decomposition of plant materials to form humus

ii)Wind

- Influences the rate of transpiration

- Causes evaporation in the soil

-

Correct Answer: B. lead

Correct Answer: C. makes messages un- readable by the recipient.

Explanation

4. Measures taken to make Public Corporations more efficient are:

(i)Red-tapism or beaurocracy:This is a problem that can affect efficiency and should be properly looked into.

(ii) Nepotism and favouritism: This should be discouraged in appointments to top positions like Managing Director, General Manager, members of Boards of Directors, etc in the corporations. Inefficiency may be enthroned instead of efficiency. This is because wrong and unqualified hands have been appointed.

(iii) Political interference: Political interference in public corporations may produce inefficiency. This should be. discouraged as well.

(iv)Monopoly: The monopoly enjoyed by most public corporations should be broken. This will make way for competition and efficiency.

(v)Working condition:There is the need for an improvement in the working conditions of the workers.

(vi) Employment of qualified staff: Highly qualified and technical hands should be employed to enhance efficiency.

(vii)Tribalism and sectionalism: This cankerworm can destroy the image and efficiency of a public corporation and so should be undermined or discouraged.

(viii) Political instability:Constant and frequent change of government may affect the efficiency of public corporations.

(ix)Mismanagement of fund: Public corporations should curb these excesses.

Correct Answer: C. Hearing

Correct Answer: C. Liver

Explanation

The alimentary canal, also known as the digestive tract, is a long tube that extends from the mouth to the anus and is responsible for the digestion and absorption of food. The organs that are part of the alimentary canal include the mouth, esophagus, stomach, small intestine, and large intestine. The liver produces bile, which aids in the digestion and absorption of fats, but its location is outside of the alimentary canal.

Correct Answer: D. Malay Archipelago