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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Here are the answers to the questions from the image: SECTION I 1. C. Colon Faeces are formed in the colon, where water is absorbed from undigested food material, and then stored in the rectum before elimination. 2. D. Maize Maize (corn) is a common cereal grain used in the production of beer, alongside barley and wheat. 3. A. Cholera Cholera is an acute diarrheal disease caused by infection of the intestine with the bacterium Vibrio cholerae. 4. B. Conserve heat and in flying Feathers provide insulation, helping birds conserve body heat, and are essential for flight. 5. C. Nitrogen gas is not used in respiration Nitrogen gas makes up about 78% of the air we breathe in and out because it is largely inert and not utilized in the process of human respiration. 6. D. Plastic bags Plastic bags are non-biodegradable and persist in the environment for a very long time, making them a significant land pollutant. 7. A. Cube of sugar Assuming the reagent dropped is iodine solution (which is brown), a cube of sugar (sucrose) does not contain starch, so it would not react to turn blue-black. Thus, the iodine solution would retain its original brown color. SECTION II 8. C. Wing and leg In a housefly, the wings are responsible for flight, and the legs are used for walking and perching, both being primary means of movement. 9. B. Grey matter Synapses, the junctions where nerve impulses are transmitted between neurons, primarily occur in the grey matter of the spinal cord, which contains neuron cell bodies and unmyelinated axons. 10. D. Valves Both veins and lymphatic vessels operate under low pressure and contain valves to prevent the backflow of fluid (blood in veins, lymph in lymphatic vessels), ensuring unidirectional flow. 11. The question for this diagram is missing. That's 2 down. 3 left today — send the next one.