Level: JHS, Basic 8 | Subject: Integrated Science | Strand: Humans and the Environment | Topic: Science and Industry
Read the summary notes first, then try these questions. Go back to the summary notes for this topic.
Part A has 20 tick-box questions. Part B has 5 essay questions with a marking guide at the bottom.
Test Yourself: 20 Objective Questions
Tick one answer for each question, then press Review answer. If your answer is wrong, it will be marked first, then the correct answer will show in green.
Essay Questions
- (a) What is saponification? (b) Name the raw materials used in soap making. (c) State two safety rules in soap making. (6 marks)
- Describe the main steps in making gari from cassava. (5 marks)
- Explain the science of fermentation in kenkey making. State two benefits of fermented foods. (5 marks)
- State the difference between African black soap and African white soap. (3 marks)
- Give four reasons why local industries are important to Ghana. (4 marks)
Essay Questions: Marking Guide for Teachers and Parents
- (a) The process of making soap by reacting fats or oils with an alkali (2). (b) Fats or oils (1) and an alkali such as caustic soda or potash (1). (c) Any two safety rules (1 mark each) such as wear gloves and goggles, add caustic soda to water, keep chemicals away from children. Give credit for equivalent answers.
- Sorting and peeling (1), washing and grating (1), fermentation and de-watering by pressing (1), sieving (1), frying or roasting (1).
- Microorganisms such as lactic acid bacteria and yeast break down sugars (1) to lactic acid and carbon dioxide (1). The acid lowers pH and prevents spoilage (1). Benefits (1 mark each, any two): lasts longer, gives flavour, easier to digest, adds nutrients.
- Black soap contains ash from plant materials, so it is dark and rough (2). White soap has no ash, so it is lighter and milder (1).
- Any four (1 mark each): create jobs, add value to raw materials, provide goods for homes, earn income, support farmers, supply export goods.
Education Always (education.inspiringalways.com). Original practice questions, not official WAEC or BECE questions.