Correct Answer: A) Low melting point

Explanation

(a)The main features of the Malthusian theory are:

(i) That population was growing at a geometrical progression while food production was growing at arithmetical progression.

(ii) That there is a tendency for all living things to grow beyond the food available to them.

(iii) Unless population increase is matched with means of subsistence, negative and positive checks will come into force.

(iv) That population is essentially limited by the means of subsistence.

(b) The theory has become irrelevant due to the following facts:

(i) The development in technical knowledge and mechanization of agriculture to increase food supply.

(ii) Changes in social attitudes as regards family size.

(iii) Increased efficiency in the transportation system enables more materials to be provided to areas that needed them.

(iv) The industrial revolution also changed the idea of land as a fixed factor of production.

(v) Opening of new colonies which provided the needed land

(vi) The interdependency of nations as a result of international trade.

Explanation

Let T and B be the top and base of the control tower respectively; P, the point of pilot's observation and PS, the line of observation.

(a) Shortest distance is |PB|.

\(\therefore \cos 33° = \frac{8.5}{PB}\)

\(PB = \frac{8.5}{\cos 33} = \frac{8.5}{0.8387}\)

\(|PB| = 10.135km \approxeq 10.1km\)

(b) Height of the control tower = |SB| - |ST|

\(\therefore \tan 33° = \frac{|SB|}{8.5 km} \implies |SB| = 8.5 \tan 33°\)

\(|SB| = 5.52 km\)

\(\tan 30° = \frac{|ST|}{8.5 km} \implies |ST| = 8.5 \tan 30°\)

\(|ST| = 4.907 km\)

\(\therefore\) The height of the tower = 5.52 km - 4.907 km = 0.613 km.

Correct Answer: D. went off

Explanation

The correct option is D. went off.

The phrasal verb go off (past tense: *went off*) is the standard English idiom used when an electrical device, power supply, or light suddenly stops working or turns off.

• *Quenched* is non-standard/slang in this context.

• *Were taken away* and *came off* are incorrect expressions for a power cut or turning off of a light.

Explanation

(a) Definition of terms:

(i)Elimination: Removal of undigested food; from the body of living organisms.

(ii)Excretion: Removal of waste products of metabolism; from the cells/tissues of an organism; may be toxic if retained in the body.

(iii)Secretion: Production and release of substances; useful to the body; by specialized glands of living organism.

(b) Digestion of boiled fish in the gut of humans:Boiled fish is a source of protein; chewed and swallowed into the stomach; digestion of protein starts from the stomach; stomach secrets gastric juice; containing pepsin, rennin and hydrochloric acid; pepsin in acidic medium acts on the boiled fish and convert it to peptides; peptides move into the duodenum/small intestine; into which pancreatic juice is secreted; undigested protein is acted upon by trypsin in alkaline medium; into peptides/peptones, erepsin finally acts on peptides/peptones in alkaline medium; and converts it into amino acids.

(c) Diagram of villus

Title TL: - Longitudinal section of villus. Size: (8 — 10cm long).

Quality (Q): Clarity of lines. Neatness of labels.

Details: Epithelium layer shown (EL) Conical shape of villus (one cell thick) (CV).

Labels (L): Epithelium layer blood capillary, lacteal, lymphatic vessels, goblet cells, venule, arteriols, cryps of lieberkuhn, cells of paneth, muscularis mucosa.

Correct Answer: C. It has a legal existence

Explanation

While several studies have investigated the contribution of Muslim women in various fields of the classical civilisation of Islam, such as in hadith transmission, jurisprudence (fiqh), literature, and education, until now few sources mention the role of women in the development of science, technology, and medicine in the Islamic tradition. In scholarship, there are isolated and scattered references to the famous women who had a role in advancing science and who established charitable, educational and religious institutions. Some examples include Zubayda bint Ja

Correct Answer: B. visible imports exceeds Visible exports

Correct Answer: B. Istinshaq

Correct Answer: B. 6