Correct Answer: D) nematode

Correct Answer: D. on

Explanation

The most appropriate preposition to complete the sentence is D. on.

To act on advice is a common idiom meaning to take action based on or in accordance with the advice received.

Let's look at why the other options don't fit as well:

• A. through - While you might achieve something through advice, acting through the advice is not the standard idiom for following advice.

• B. at - Acted at the advice is grammatically incorrect in this context.

• C. from - Acted from the advice is less common and less idiomatic than acted on the advice when referring to following recommendations.

Therefore, the correct sentence is: The principal was able to establish a functional language laboratory for school because he acted on the advise of experts on the subject.

Correct Answer: C. preparing ridges for planting

Correct Answer: C. Afforestation

Correct Answer: A. the objects of the company

Explanation

The object clause contained in the articles of association of a company sets out the objects for which the company has been formed.

Correct Answer: B. Chief Ladoke Akintola

Correct Answer: C. inelastic

Explanation

(a)Opportunity cost means the alternative forgone in order to satisfy a particular want. It refers to the satisfaction of one want at the expense of another want. It arises as a result of scarce resources to satisfy numerous wants and desires, e.g. the opportunity cost of purchasing a textbook, to a student, is the shirt he should have bought which he sacrificed to get the textbook. Opportunity cost means real cost and it is different from money cost. The real cost of the text-book is the shirt forgone.

(b)(i)Importance of opportunity cost to individuals:It helps individuals to make judicious use of their scarce resources to satisfy unlimited wants. For example, a farmer can use a piece of land for planting cocoa or coffee. If he grows cocoa because of the present economic value of cocoa, the opportunity cost of cocoa is the coffee forgone.

(ii) Importance of opportunity cost to the Government: It helps the government in deciding which sector will receive more resources. It helps the government in making decision on how to spend its revenue in carrying out its numerous projects, e.g. the government may allocate more resources to defence or infrastructure.

(iii) Importance of opportunity cost to the firms:It helps the firms or industry in making decision on which resources to use in production and the method of production to be used, i.e. capital intensive or labour intensive.

Explanation

(a) Reasons for imposing tariffs are:

(i)To raise revenue: For some third world countries, the main source of revenue is the taxes collected on imports.

(ii)Protection of infant industries:There is the need for nations to protect their infant industries from undue competitions with foreign ones from developed countries.

(iii)To prevent dumping:Taxes are imposed on imports to prevent the selling of goods in foreign countries at prices far below those charged in the home markets.

(iv) Balance of payment improvement:Tariffs help to improve a country's balance of payment/trade.

(v)Self reliance: To make a country self-reliant and consume locally-made goods, instead of foreign goods.

(vii)Political reasons:Tariffs can also be imposed for political motives to discriminate against unfriendly countries.

(b) Functions of the Customs Authorities:

(i) The agency is responsible for collecting revenue due from tariffs and excise duties.

(ii) It ensures that only authorised goods are allowed into the country; it checks smuggling and seized contraband goods.

(iii) It ensures that only licensed goods to be exported are allowed to leave the country for export or come into the country as import.

(iv) It also checks illegal trafficking of currency notes.

(v) It is involved in compilation of a wide range of statistics on foreign trade which is made available to the government.

(vi) It provides appropriate quarantine facilities for the import of live animals and living plants.

(vii) The agency also supervises bonded warehouses.

Correct Answer: A. The Judiciary