Explanation

(a)(i) I Biotechnology is the use of biological processes / living organisms to make products for human use.

II. Biogas is a fuel obtained from organic waste through the process of anaerobic decomposition

(ii) Production of drugs (medical), fertilizer, waste management, production of kenkey, fufu, gars, burukutu / any food or beverage produced from fermentation (domestic), industrial application, etc

(b)(i) — Add yeast to cane sugar and leave to stand (at room temperature)

— Enzyme sucrose hydrolyse / converts

— Enzyme zymase ferments / converts glucose to ethanol and CO\(_2\)

— Mixture is distilled to obtain ethanol.

ii) Carbon IV oxide

(iii) — In aerated drinks

— as fire extinguisher

— coolant / refrigerant

— solvay process

— synthesis of Na\(_2\)CO\(_3\)

iv) Ethanol from cane sugar is renewable because It is from plants which can be cultivated continuously Ethanol from petroleum is non-renewable because it is from a sou;-c,o, which can get exhausted. Heavy chemicals are chemicals used extensively in industries and are produced in very large quantities. Fine chemicals are chemicals produced in small quantities for specific purposes and to a very higil degree of purity. Heavy chemicals — H\(_2\)SO\(_4\), NaOH, NH\(_3\), CaCO\(_3\), HNO\(_3\), HCI, NaCO\(_3\) bleaching powder, metals (iron, tin, aluminium, Copper, Zinc).

Fine chemicals — laboratory / analytical reagents, drugs, dyes, perfumes, photographic reagents, additives, cosmetics.

d) O\(_2\), C\(_{12}\)HCI increasing order to deviation The extent of deviation depends on intermolecular forces. HCI is a polar and will have a greater intermolecular attraction than Oxygen and Chlorine. The molar mass of chlorine is greater than that of oxygen hence stronger van der waals forces than oxygen

Correct Answer: C. It can effectively be controlled by vaccination

Correct Answer: B. public limited companies

Correct Answer: B. Maize grain

Correct Answer: A. inestimable

Correct Answer: A. 89

Explanation

The median is the middle number of the set, when it is listed in order from smallest to largest or vice versa. In this case we have an even amount of numbers in the set meaning there are two middle numbers. But for this set, both of those middle numbers are 89, meaning we don't need to take an average. This gives us the final answer of 89 for the median.

Explanation

\(< PRQ = 90°\)

Gradient of PR \(\times\) Gradient of QR = -1.

\(\frac{5 - 3}{k + 1} \times \frac{5 - 4}{k + 4} = -1\)

\(\frac{2}{(k + 1)(k + 4)} = -1\)

\(-2 = k^{2} + 5k + 4 \implies k^{2} + 5k + 4 + 2 = 0\)

\(k^{2} + 5k + 6 = 0\)

\(k^{2} + 3k + 2k + 6 = 0\)

\(k(k + 3) + 2(k + 3) = 0 \implies (k + 3)(k + 2) = 0\)

\(\implies \text{k} = -2 or -3\)

Explanation

(a) Water cycle

• Condensation in clouds
• Precipitation/Rainfall
• Evaporation of water from water bodies/river/sea/ ocean
• Evaporation of water from soil/ground
• Excretion by animals
• Drinking of water by animals
• Perspiration/sweating/respiration by animals
• Erosion/run-off of water from soil/ground
• Decay in plants/ animals.

(b) Experiment:

-A young herbaceous plant/balsam/water leaf/ plant is uprooted/cut a twig of a young herbaceous plant under water

- the cut twig/the roots are washed with water; to remove the soil particles

-a solution of a dye/eosin/red ink is made in a beaker

- the roots of the plant/cut twig is immersed in the solution.

- and set up exposed to sunlight

-and allowed to stand for one to six hours

-remove the plant from the solution and wash the roots/stem/of twig thoroughly

- make transverse sections of the root/stem

- observe the sections under the microscope

- it will be observed that only the xylem tissues pick the dye/is stained re-indicating that water is conducted in the xylem tissues.

Correct Answer: D. 33.3%

Correct Answer: C. an increase in the demand for locally produced goods