What happens when two unlike poles of two different magnets come closer to each other? (1 mark)

Here are the answers to your questions: 16) What happens when two unlike poles of different magnets come closer to each other? When two unlike poles of different magnets come closer to each other, they attract* each other. Answer: They attract each other. 17) State any one advantage of using renewable energy. One advantage of using renewable energy is that it does not produce greenhouse gases*, thus reducing air pollution and climate change. Answer: It does not produce greenhouse gases. 18) What energy change takes place when a piece of wood is burned? When wood is burned, chemical energy stored in the wood is converted into heat energy and light energy*. Answer: Chemical energy is converted into heat and light energy. 19) Read the statement and answer the questions that follow: At 100^ C and at standard pressure, water changes state from liquid to gas (water vapour). At 0^ C and below this temperature, liquid water becomes solid water called ice. a) What is the boiling point of water? The boiling point of water is the temperature at which it changes from liquid to gas. Answer: 100^ C b) Determine the melting point of ice. The melting point of ice is the temperature at which solid water (ice) changes back to liquid water, which is the same as the freezing point of water. Answer: 0^ C c) Name the change of phase from liquid water to ice. The change of phase from liquid water to ice is called freezing or solidification*. Answer: Freezing 20) Draw a simple leaf and show the following parts: (Tip: margin, midrib, leaf veins and lamina) As an AI, I cannot draw. However, I can describe the parts: Lamina*: The broad, flat part of the leaf. Midrib*: The central vein running through the lamina. Leaf veins*: Smaller veins branching out from the midrib. Margin*: The edge of the leaf. 21) Air is a mixture of gases. Give any two examples of gases found in air. (i) Nitrogen* (ii) Oxygen* Answer: Nitrogen, Oxygen 22) Why is the heart separated into two parts or sections? The heart is separated into two parts (right and left) to prevent the mixing of oxygenated blood (from the lungs) and deoxygenated blood* (from the body), ensuring efficient oxygen delivery. Answer: To prevent mixing of oxygenated and deoxygenated blood. 23) Which of the following organs is not involved in breathing? a. Diaphragm b. Bronchioles c. Oesophagus d. Wind pipe The oesophagus* is part of the digestive system, not the respiratory system. Answer: c. Oesophagus 24) Give any four characteristics of living things. (i) Movement* (ii) Respiration* (iii) Growth* (iv) Reproduction* Answer: Movement, Respiration, Growth, Reproduction 25) Give examples of each of the following bones: a) Long bones: Examples include the femur (thigh bone) and humerus* (upper arm bone). Answer: Femur, Humerus b) Short bones: Examples include the carpals (wrist bones) and tarsals* (ankle bones). Answer: Carpals, Tarsals c) Flat bones: Examples include the scapula (shoulder blade) and cranial bones* (skull bones). Answer: Scapula, Cranial bones 26) Choose the by-products of respiration in human. (i) carbon dioxide (ii) oxygen (iii) water vapour (iv) nitrogen During respiration, humans take in oxygen and release carbon dioxide and water vapour* as by-products. Answer: (i) carbon dioxide and (iii) water vapour 27) Apart from movement, give any two other functions of the human skeleton. (i) Support*: The skeleton provides a framework that supports the body. (ii) Protection*: It protects vital internal organs (e.g., skull protects the brain, rib cage protects the heart and lungs). Answer: Support, Protection 28) Where in the digestive system do the following take place? This question is incomplete as the specific processes or substances to be located in the digestive system are not provided. 3 done, 2 left today. You're making progress.