In any set of data, median represents the

• A. value that is most representative of the data
• B. mid-position when the values are arranged in ascending or descending order
• C. mid-position when the values are arranged randomly
• D. difference between the highest and the lowest values when arranged in ascending order

Filtered blood from the kidney is carried back to the circulatory system through the

• A. hepatic portal vein
• B. renal artery
• C. renal vein
• D. pulmonary vein

(a) Define crop improvement. [2 marks]

(b) Copy and complet the table below based on Mendel's Law of Indepen-dent Assortment of Genes (Dihybrid inheritance).

Use the following information: T = Tall; C = Coloured; t = Dwarf; c = White. (Where T and C are dominant character; while t and c are recessive TC TTCC characters) [6 marks]

(c) Calculate the percentage of plants in (b) above that are: (i) Tall coloured; (ii) Tall white; (iii) Dwarf coloured; (iv) Dwarf Tc Ttcc white [8 marks]

In a divided circle illustrating the world's export of crude oil, the section taken up by the share of a certain country measures 72°. The share of that country's export expressed in a percentage is?

• A. 10
• B. 15
• C. 20
• D. 25

Which of the following is a major problem affecting the development of the Southern coast-lands of Nigeria?

• A. poor soil fertility
• B. Oil pollution and spillage
• C. Ocean tides
• D. Hilly terrain of the area

The greatest volcanic regions of Africa are found in

• A. The maghrib
• B. Kenya and Tanzania
• C. The cameroons
• D. Sudan and Ethiopia

Study the map extract on a scale of 1:50,000 and answer the following questions:

(a) On the map, mark and name one example of each of the following features with the letters in bracket:

(i) Spur (SP);

(ii) Gentle slope (GS);

(iii) Watershed (WS);

(iv) V-shaped valley (VS).

(b) In your answer booklet;

(i) calculate the length (in km) of River Dakorobi from its source to the point where iL joins River Sencha. (Show all workings clearly);

(ii) describe the relief of the mapped area.

(c) Highlight the influence of relief on settlement in the area. P

Which of the following is true in blood transfusion?

• A. person of blood group AB can donate blood only to another person of blood group AB
• B. persons of blood groups A and B can donate or receive blood from each other
• C. A person of blood group AB acn receive blood only from persons of blood group A or B
• D. A person of blood group O can donate only to a person of blood group O

Solve the following simultaneous equations: x+ y = 3/2; x - y = 5/2 and use your result to find the value of 2y + x

• A. -2
• B. -1
• C. 1/2
• D. 1

From the words lettered A to D, choose the word that has the same vowel sound as the one represented by the underlined letters or letters underlined. Brought

• A. roar
• B. plough
• C. drought
• D. worse