This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.
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You're on a roll — Here are the answers to the questions: 13. Which one of the following does not bring about indigestion in man? C. Eating enough roughage Roughage (dietary fiber) aids digestion and helps prevent indigestion, while the other options can contribute to it. 14. All the following are symptoms of food poisoning except ... D. cough Nausea, vomiting, and fever are common symptoms of food poisoning. A cough is typically a symptom of respiratory illness. 15. Metals react with acid to liberate ... B. hydrogen gas When reactive metals react with dilute acids, they displace hydrogen from the acid, producing hydrogen gas. For example, Mg (s) + 2HCl (aq) → MgCl_2 (aq) + H_2 (g). 16. One of the following cannot be used to control food poisoning? B. Improper storage and temperature control Improper storage and temperature control cause* food poisoning by allowing bacteria to multiply, so it cannot be used to control it. The other options are methods to prevent food poisoning. 17. Group VIII elements are ... B. unreactive Group VIII (or Group 18) elements are the noble gases, which have a full outer electron shell, making them very stable and unreactive. 18. Which of the following cannot be used to control pollution in Ghana? C. Placing liquid and semi-liquid wastes in unlined pits Placing waste in unlined pits allows pollutants to seep into the soil and groundwater, causing severe environmental pollution. This practice contributes to pollution rather than controlling it. Excessive use of agrochemicals (A) also causes pollution, but placing waste in unlined pits is a direct and harmful waste disposal method. 19. Which of the following practices cannot cause diseases in man? B. Keeping good personal hygiene Good personal hygiene helps prevent the spread of germs and diseases, thus it does not cause diseases. The other options can contribute to health problems. 20. Calculate the amount of substance in 20g of C_6H_12O_6? [C=12 H=1 O=16] B. 0.11mol Step 1: Calculate the molar mass of C_6H_12O_6. Molar mass = (6 × 12) + (12 × 1) + (6 × 16) Molar mass = 72 + 12 + 96 = 180 g/mol Step 2: Calculate the amount of substance (moles). Moles = MassMolar mass Moles = 20 g180 g/mol Moles ≈ 0.111 mol 0.11 mol 21. The correct sequence in the application of the scientific method during an investigation is ... C. Hypothesis → Experimentation → Scientific knowledge The scientific method typically involves forming a hypothesis, testing it through experimentation, and then using the results to build scientific knowledge. 22. Which activity best illustrates the harmful use of scientific knowledge? D. Use of DDT to kill fish in rivers DDT is a persistent organic pollutant that causes significant environmental damage and harm to wildlife, including fish. Its use to kill fish is a harmful application of chemical knowledge. 23. Which of the following quantities is a fundamental quantity? D. Mass Fundamental quantities (or base quantities) are independent of other quantities. Mass is a fundamental quantity in the SI system, while force, volume, and weight are derived quantities. 24. A chemical bottle labelled with a fire symbol indicates that the substance is ... C. flammable The fire symbol (flame pictogram) is used to indicate that a substance is flammable and can easily catch fire. 25. A metal block of mass 75g occupies a volume of 39 cm^3. What is its density? C. 1.92 g cm^-3 Step 1: Identify the given values. Mass (m) = 75 g Volume (V) = 39 cm^3 Step 2: Use the formula for density ( = (m)/(V)). = 75 g39 cm^3 ≈ 1.923 g/cm^3 1.92 g cm^-3 Send me the next one 📸