Provide answers to the following questions regarding plant nutrients, body functions, waste management, mixtures, and work output.

Here is the solution to question 4: a) (i) Two micro-nutrients of plants: • Iron • Zinc (ii) Two macro-nutrients of plants: • Nitrogen • Potassium b) (i) Transport of nutrients: Blood plasma (ii) Protection of the body against infection: White blood cells (iii) Temperature regulation: Blood plasma c) Three effects of poor waste management on human health: • Contamination of water sources, leading to waterborne diseases like cholera and typhoid. • Creation of breeding grounds for disease vectors such as mosquitoes and rats, which spread diseases like malaria and dengue. • Air pollution from burning waste, causing respiratory problems and other health issues. d) (i) Differentiation between a colloid and a suspension: • A colloid is a heterogeneous mixture where particles are larger than those in a solution but small enough not to settle out. They scatter light (Tyndall effect). • A suspension is a heterogeneous mixture where particles are large enough to be seen with the naked eye and will settle out over time. They also scatter light. (ii) Classification of mixtures: (α) Groundnut paste and water: Suspension (β) Milk and water: Colloid (γ) Sugar and water: Solution e) (i) Work output: Work output is the useful work done by a machine. It is the energy transferred by the machine to perform a specific task. (ii) How work output affects the efficiency of a machine if work input is fixed: The efficiency of a machine is calculated as the ratio of work output to work input, multiplied by 100%. If the work input is fixed, an increase in the work output will lead to an increase in the machine's efficiency. Conversely, a decrease in work output will result in a decrease in efficiency. That's 2 down. 3 left today — send the next one.