Explanation

An African thunderstorm is a highly descriptive poem about the ravages caused by a typical storm.

The two aspects of the storm — its characteristics and its effects — are clearly brought out. In respect of its characteristics, the storm, as a natural phenomenon, is presented as destructive and fearsome. The wind that blows in its wake "tosses up things in its tails/like a madman chasing nothing" "or like a plague of locusts". .

The above two similes emphasize the chaos that is caused. The impression formed is that of some brute force tha: is being unleashed. There is a sense of the foreboding as the "pregnant clouds" gather to "perch on hills". Hell appears to break loose as nothing is spared in the wind's trail. As the accompanying thunder is unleashed and the storm's effects diminish, this is felt in the onomatopoeia words "tremble", "rumble", "crack" and "pelting".

The storm's effects on its surroundings are also conveyed in words that appeal to the senses. "Screams of delighted children" contrast with the frenzied movement of women carrying their babies on their backs upon sensing danger. Their clothes are torn apart, "exposing dangling breasts". Not spared, even, are the trees which "bend" to let it pass.

Correct Answer: B. Rat

Correct Answer: C. had plucked

Correct Answer: A. presenting the problems of social class and British mannerism

Correct Answer: A. Bernard Bourdillon

Correct Answer: C. 5, 7, 8

Correct Answer: D. 6x² + 12x + 6

Explanation

Materials used to demonstrate Brownian motion are: Pollen grains, dust particles, smoke particles, potassium permanganate crystals, carbon particles, etc.

Explanation

(a)Ageing population occurs when there is an increase in the proportion of old people in the population.

(b) Effects of Ageing population on an economy are:

(i) The dependency ratio will be high and the rate of expenditure will increase because old people require food, health services etc.

(ii) The working population will decline consider-ably.

(iii) Investment pattern will change as production of goods to satisfy old people's needs increases.

(iv) Population becomes less mobile geographically and occupationally.

(v) The gross domestic products of the country will fall

(vii) The level of savings will be affected as expenditure increases.

Correct Answer: D) heating of ammonium chloride

Explanation

Option A, burning of bush, is an example of a chemical change because it involves a chemical reaction that changes the composition of the material being burned. Option B, rusting of a metal, is also a chemical change because it involves the reaction of metal with oxygen in the air to form a new compound.

Option C, dissolution of calcium in water, is a physical change because it involves the breaking of bonds between calcium ions and the anions they were originally bonded to. The calcium ions remain the same, they are just separated from their original compounds and dispersed in the water.

Option D, heating of ammonium chloride, is a physical change because it involves the application of heat to ammonium chloride, causing it to change from a solid to a gas without changing its chemical composition. This change is reversible, as if the gas is cooled it will return to its solid state.

Therefore, the correct answer to this question is option D, heating of ammonium chloride. This is because it is an example of a physical change, which does not change the chemical composition of the substance.