O Level Biology Weekly Quiz- Updated 2025 View Larger Image Free Quiz This quiz is free feel free to take it as many times as you like. 1. Concentration of Carbon Dioxide The graph shows the concentration of carbon dioxide in the air surrounding a plant measured over 24 hours. Which explains the carbon dioxide concentration at time X? daylight and photosynthesis darkness and transpiration daylight and respiration darkness and respiration 2. As a seed begins to germinate, it uses enzymes to speed up the rate of transpiration osmosis photosynthesis digestion 3. Milk produces a red precipitate when heated with Benedict’s solution. A purple colour develops when the biuret test is used on milk. Using these results only, which nutrients does milk contain? reducing sugar and starch fat and protein fat and starch reducing sugar and protein 4. Where in the alimentary canal is most water absorbed? ileum colon stomach oesophagus 5. Diagram showing a cell This diagram shows a cell. Which parts are the cell membrane cell wall cytoplasm respectively 2, 1, 4 1, 2, 4 1, 2, 3 2, 1 , 3 6. Plants left in sunlight The diagrams show a plant in a flask of water. It is left for six hours on a warm and windy day in bright sunshine. Which process explains the result shown in diagram 2? photosynthesis in the leaves of the plant transpiration from the leaves of the plant active transport of water into the root hairs evaporation of water from the flask 7. Salt movement in a cell The arrows show the movement of salts into a cell. Which describes the movement of the salts? diffusion down the concentration gradient diffusion against the concentration gradient active transport down the concentration gradient active transport against the concentration gradient 8. Diagram showing a cell This diagram shows a cell. Which parts are the cell membrane cell wall cytoplasm respectively 1, 2, 3 2, 1, 4 2, 1 , 3 1, 2, 4 9. What are some of the end products and effects of anaerobic respiration in muscle? water and muscle relaxation lactic acid and oxygen debt ethanol and loss of coordination carbon dioxide and muscle contraction 10. Cross section of a leaf Where in the leaf does gaseous exchange occur? 2 and 3 1 and 3 3 and 4 1 and 2 11. Cylinders of potato tissue were placed in different concentrations of a sugar solution. The graph shows the percentage change in length of the cylinders of potato tissue. Which solution has the same water potential as the potato tissue? 0.5 mol 0.2 mol 0.3 mol 0.0 mol Loading … Question 1 of 11 To read Biology Notes here Share this: Click to share on X (Opens in new window) X Click to share on Facebook (Opens in new window) Facebook By garikaib|2025-02-12T09:32:50+02:00February 12th, 2025|Exams, Ordinary Level Exams|Comments Off on O Level Biology Weekly Quiz- Updated 2025 Share This Story, Choose Your Platform! FacebookTwitterEmail About the Author: garikaib He holds an Honours in Accountancy degree from the University of Zimbabwe. He is passionate about technology and its practical application in today's world. Related Posts November 2009 English Language Paper 1 (Without Answers)- Updated 2025 November 2009 English Language Paper 1 (Without Answers)- Updated 2025 June 2014 English Language Paper 1 (Without Answers)- Updated 2025 June 2014 English Language Paper 1 (Without Answers)- Updated 2025 November 2013 Economics Paper 3 (Without Answers)- Updated 2025 November 2013 Economics Paper 3 (Without Answers)- Updated 2025 O Level History Weekly Quiz- Updated 2025 Gallery O Level History Weekly Quiz- Updated 2025 November 2013 Commerce Paper 2- Updated 2025 November 2013 Commerce Paper 2- Updated 2025