This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.
ScanSolve AI Answer
It looks like you're asking for questions 6, 7, and 8 again. Here are the solutions, formatted as requested: 6. a) State four (4) ways of controlling mosquitoes in the community. • Eliminate stagnant water bodies (breeding sites). • Use insecticide sprays or larvicides. • Encourage the use of mosquito nets. • Promote proper waste management. b) Give four (4) measures that can be taken to minimize the negative impact of gold extraction on the Ghanaian environment. • Implement and enforce strict environmental regulations. • Reclaim and reforest mined-out areas. • Treat wastewater from mining operations before discharge. • Promote environmentally friendly mining technologies (e.g., reducing mercury use). c) State four (4) importance of cover cropping in crop production. • Soil erosion control: Protects soil from wind and water. • Weed suppression: Outcompetes weeds. • Soil fertility improvement: Adds organic matter and fixes nitrogen. • Moisture retention: Reduces evaporation. d) State two (2) uses of each of the following i) Metals • Used in construction (e.g., steel for buildings). • Used for electrical wiring (e.g., copper). ii) Non-metals • Oxygen is essential for respiration. • Carbon (as coal) is used as a fuel source. 7. a) i) Define light energy. Light energy is a form of electromagnetic radiation that is visible to the human eye and travels in waves. a) ii) Explain two (2) ways in which light energy is useful to living organisms. • Photosynthesis: Plants use light energy to convert carbon dioxide and water into glucose and oxygen. • Vision: Animals use light energy to perceive their surroundings, aiding navigation and food finding. b) i) Define an atom. An atom is the smallest unit of an element that retains the chemical identity of that element, consisting of a nucleus surrounded by electrons. b) ii) An atom has 11 electrons. a) Draw the electronic configuration of the atom. The electronic configuration is 2, 8, 1. b) Type of bond the element will form with chlorine. The element will form an ionic bond with chlorine. c) Give two (2) reasons for the type of chemical bond stated in (β) above. • There is a large difference in electronegativity between the metal (sodium) and the non-metal (chlorine). • Sodium transfers its valence electron to chlorine, forming stable ions (Na^+ and Cl^-). c) i) Define food poisoning. Food poisoning is an illness caused by consuming food contaminated with harmful microorganisms or their toxins. c) ii) Explain two causes of food poisoning. • Improper cooking: Food not cooked to the correct temperature may not kill harmful pathogens. • Cross-contamination: Transfer of pathogens from raw foods to ready-to-eat foods. d) State two (2) methods of soil conservation. • Contour plowing: Plowing across slopes to reduce runoff. • Crop rotation: Alternating crops to maintain soil fertility and structure. 8. a) i) State the law of floatation. The law of floatation states that a floating object displaces a weight of fluid equal to its own weight. a) ii) Explain how a submarine operates. A submarine operates by changing its buoyancy. It fills ballast tanks with water to increase density and dive, and expels water with compressed air to decrease density and surface. b) i) State three (3) ways of preventing dental decay. • Brush teeth regularly with fluoride toothpaste. • Limit sugary foods and drinks. • Floss daily. b) ii) State one (1) cause each of: a) Constipation: One cause is insufficient fiber in the diet. b) Indigestion: One cause is eating too quickly or consuming fatty/spicy foods. c) i) What is an alloy? An alloy is a mixture of two or more elements, at least one of which is a metal, combined to create a new material with enhanced properties. c) ii) Name the main elements present in each of the following: a) Bronze: Copper and Tin b) Nichrome: Nickel and Chromium c) Duralumin: Aluminium, Copper, Magnesium, and Manganese d) i) List two (2) types of animal parasites. • Endoparasites (e.g., tapeworms) • Ectoparasites (e.g., ticks) d) ii) State three (3) economic importance of the grasshopper. • Crop damage: They are agricultural pests that destroy crops, causing economic losses. • Food source: They serve as a food source for various animals in the ecosystem. • Bait: They can be used as bait for fishing. Last free one today — make it count tomorrow, or type /upgrade for unlimited.