Correct Answer: D) gametes

Explanation

In sexual reproduction, organisms produce special cells called gametes which are used to unite with the opposite sex to form a new individual. These gametes are produced by mature individuals of sexually reproducing species. The question is asking for the name of these sexual reproductive units. The options given are sperms, ova, zygotes, and gametes. Sperms are the male gametes produced by males while ova are the female gametes produced by females. Zygotes, on the other hand, are the cells formed as a result of the fusion of gametes during fertilization. Therefore, the correct answer to this question is option D: gametes. Gametes are the sexual reproductive units produced by mature individuals of sexually reproducing species of organism. It is important to note that gametes are haploid cells, meaning they contain half the number of chromosomes compared to the somatic cells of the organism. This is important because during fertilization, when two gametes fuse, the resulting zygote will have the normal number of chromosomes of the species. Overall, gametes are essential for sexual reproduction as they are the cells that unite during fertilization to form a new individual with a unique combination of genetic material from both parents.

Correct Answer: D. none of the above

Explanation

(i) Boyle's law states that the volume of a given mass of gas is inversely proportional to its pressure if the temperature remains constant.

(ii) P \(\propto\) 1 or PV = K or V \(\propto\) \(\frac{1}{P}\)

(iii)

\(\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\)

\(V_2 = \frac{P_1V_1T_2}{P_2T_1}\)

\(V_2 = \frac{6.5 \times 10^4 \times 500 \times 273}{(273 + 30) \times 1.01 \times 10^5}\)

\(V_2 = 290 cm^3\)

(c) An inflated balloon expands in warm water because in air, particles in the balloon acquire more kinetic energy. There is an increase in the pressure inside the balloon. In order to keep the pressure constant the balloon expands.

(d) (i) Vapour density is the number of times a given volume of a gas or vapour is as heavy as an equal volume of hydrogen gas at the same temperature and pressure.

(ii) molar mass of SO\(_2\) = 32 + 16 x 2 = 64g mol\(^{-1}\).

Vapour density x 2 = relative molar mass

Vapour density = \(\frac{64}{32}\)

= 32

(e) (i) I. upward delivery = NH\(_3\)

II. downward delivery = SO\(_2\)

(ii) I. acidic II. basic/alkaline

(iii) SO\(_2\) – oxidizing agent NH\(_3\) - reducing agent.

(f) (i) – bronze – typemetal – soft solder

(ii) bronze – for making coins, - metals/other ornaments

typemetal – for printing

soft solder – for plumbing/welding.

Explanation

(i) Federalism. The Constitution consolidated the federal system of government in the country.

(ii) Full ministerial responsibilities. Nigerians were made ministers with portfolios.

(iii) Direct elections. It brought direct elections to the Eastern and Western Legislatures.

(iv) Premier. Each of the three regions had a premier as the leader of government.

(v) Regionalization of the civil service and Judiciary.

(vi) Establishment of the offices of the Speaker and Deputy Speaker in each legislature.

(vii) It made Governor to become Governor-General and Lieutenant Governors to Governors.

(viii) Lagos was made a Federal capital territory and no longer part of the Western Region.

(ix) Southern Cameroon was granted semi-autonomy. .

(x) Membership of the central legislature was increased from 149 to 188.

Correct Answer: C. a flexible constitution

Explanation

A flexible constitution is one that is readily changeable, where amendments might be as easy as passing a normal piece of legislation.

Correct Answer: A. choose between alternatives, given limited resources

Correct Answer: B. accepted defeat

Explanation

throw in the towel : to admit defeat . to stop trying to do something because you have realized that you cannot succeed

Explanation

(a) List Modes of Transportation: -Road/land -Railway -Water-Air -Pipeline -Ropeway/cable/metro line -Man/human portage -Animals/ beast of burden, e.g donkey, horse, etc.

(b) Outline Reasons for the Construction of Railways in Developing Countries:-Linking important cities/regions -Movement of people -Movement of goods and services -Useful in times of emergencies -For ease of administration -Access to natural resources Promote major crop production in the interior -To promote inter-regional trade -Ease postal services -Increased industrial development -Employment opportunities-Promotion of tourism -Cheap mode of transport -Opening up of new lands/areas -Growth of town settlements/towns-National integration -Facilitates international trade -Generation of revenue -Diffusion of ideas and innovations -income to workers -Linkages between areas of production and consumption -Improved standard of living-Stimulates other sector of the economy.

(c) highlight Measures that can be taken to improve Rail Transportation in Developing Countries: -Acquiring modern trains -Training and retraining of personnel -improved service delivery -Construction of more railway lines/extension of rail network-Regular servicing/maintenance of rail facilities -Provision of adequate capital for various sectors -Improved management practices -Use of tunnels/embankments -Increased patronage/subsidy -Construction of multiple tracks -Local fabrication of spare parts Construction of broad standard gauges-Adoption of uniform gauges-improved technology -Improved Communication system/signals -Linkage with other mode of transportation -Channelization of floodwater off rail tracks-Provision of adequate capital/adequate budgetary allocation -Continuity of government policies/political will -Efficient security-Importation of spare parts.

Correct Answer: B. vote

Explanation

When fund is allocated to a head, it is referred to as vote. Vote is the amount for individual items on a government budget.

Correct Answer: A. dream