Provide answers for the following questions regarding diseases, mixtures, forces, and poultry nutrition.

Here are the answers to your questions: 2. (a) (i) Fungal disease: • Ringworm • Athlete's foot (ii) Deficiency disease: • Scurvy (due to Vitamin C deficiency) • Rickets (due to Vitamin D deficiency) (iii) Non-communicable disease: • Diabetes • Asthma 2. (b) (i) Homogeneous mixture: A mixture in which the components are uniformly distributed throughout, resulting in a single phase with a consistent composition and appearance. (ii) Heterogeneous mixture: A mixture in which the components are not uniformly distributed and can be easily distinguished from one another, often existing in multiple phases. 2. (c) (i) Dragging an object on a smooth surface is easier than on a rough surface because smooth surfaces offer less friction. Friction is a force that opposes motion, so a lower frictional force requires less effort to move the object. (ii) The S.I. unit of: (a) Force: Newton (N) (b) Work: Joule (J) 2. (d) (i) A balanced ration in poultry feed is a diet that provides all the essential nutrients (carbohydrates, proteins, fats, vitamins, minerals, and water) in the correct proportions and amounts required for the optimal growth, health, and productivity of the poultry. (ii) Three effects of malnutrition in poultry: • Stunted growth and poor development. • Reduced egg production or poor egg quality. • Weakened immune system, leading to increased susceptibility to diseases. 3. (a) (i) Observations: (a) When the number of cells is doubled, the bulb will shine brighter. (b) When the number of bulbs is doubled (assuming they are connected in series), the bulbs will shine dimmer. (ii) Explanation of observations: (a) Doubling the number of cells in series increases the total voltage supplied to the circuit. According to Ohm's Law (V=IR), with constant resistance, an increase in voltage leads to an increase in current, making the bulb glow brighter. (b) Doubling the number of bulbs in series increases the total resistance of the circuit. With a constant voltage, an increase in total resistance leads to a decrease in the total current flowing through each bulb, making them shine dimmer. 3. (b) (i) Soil type: Different crops require specific soil conditions. The soil type affects nutrient availability, water retention, drainage, and aeration, all of which are crucial for root development and overall plant growth. For example, loamy soils are generally preferred for many vegetables due to their balanced properties. (ii) Nearness to source of water: Proximity to a reliable water source is vital for irrigation, especially in regions with inadequate rainfall. It ensures consistent water supply for crops, reduces the cost and effort of water transportation, and minimizes crop stress due to drought. (iii) Nearness to market: Being close to the market reduces transportation costs and time, allowing farmers to sell fresh produce quickly. This minimizes spoilage, ensures higher quality products for consumers, and can lead to better prices for the farmer. 3. (c) (i) Mutualism: A type of symbiotic relationship between two different species where both organisms involved benefit from the interaction. An example is bees pollinating flowers, where bees get nectar and flowers get pollinated. (ii) Commensalism: A type of symbiotic relationship between two different species where one organism benefits, while the other organism is neither significantly helped nor harmed. An example is barnacles attaching to whales; the barnacles get a place to live and filter feed, while the whale is unaffected. 3. (d) (i) Distinguish between: (a) Element and compound: An element is a pure substance consisting of only one type of atom and cannot be broken down into simpler substances by chemical means (e.g., oxygen, iron). A compound is a pure substance formed when two or more different elements are chemically bonded together in fixed proportions (e.g., water, carbon dioxide). (b) Molecule and ion: A molecule is an electrically neutral group of two or more atoms held together by chemical bonds (e.g., O_2, H_2O). An ion is an atom or molecule that has gained or lost one or more electrons, resulting in a net electrical charge (e.g., Na^+, Cl^-, SO_4^2-). (ii) Chemical formula of each of the following binary compounds: (a) Aluminium fluoride: AlF_3 (b) Ammonia: NH_3 That's 2 down. 3 left today — send the next one.