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 respiration darkness and transpiration darkness and respiration daylight and photosynthesis 2. Salt movement in a cell The arrows show the movement of salts into a cell. Which describes the movement of the salts? active transport against the concentration gradient diffusion against the concentration gradient active transport down the concentration gradient diffusion down the concentration gradient 3. 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? transpiration from the leaves of the plant active transport of water into the root hairs photosynthesis in the leaves of the plant evaporation of water from the flask 4. Cross section of a leaf Where in the leaf does gaseous exchange occur? 3 and 4 2 and 3 1 and 3 1 and 2 5. Diagram showing a cell This diagram shows a cell. Which parts are the cell membrane cell wall cytoplasm respectively 1, 2, 4 2, 1 , 3 1, 2, 3 2, 1, 4 6. What are some of the end products and effects of anaerobic respiration in muscle? lactic acid and oxygen debt carbon dioxide and muscle contraction water and muscle relaxation ethanol and loss of coordination 7. Diagram showing a cell This diagram shows a cell. Which parts are the cell membrane cell wall cytoplasm respectively 1, 2, 4 1, 2, 3 2, 1, 4 2, 1 , 3 8. 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 protein fat and starch fat and protein reducing sugar and starch 9. As a seed begins to germinate, it uses enzymes to speed up the rate of digestion transpiration osmosis photosynthesis 10. Where in the alimentary canal is most water absorbed? ileum stomach oesophagus colon 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? 0.0 mol 0.2 mol 0.5 mol 0.3 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 English Language Paper 1 November 2008 (Without Answers)- Updated 2025 English Language Paper 1 November 2008 (Without Answers)- Updated 2025 November 2009 Business Studies Paper 1 (Without Answers)- Updated 2025 November 2009 Business Studies Paper 1 (Without Answers)- Updated 2025 English Language Paper 1 June 2009 (Without Answers)- Updated 2025 English Language Paper 1 June 2009 (Without Answers)- Updated 2025 November 2009 Business Studies Paper 2 (Without Answers)- Updated 2025 November 2009 Business Studies Paper 2 (Without Answers)- Updated 2025 November 2009 English Language Paper 1 (Without Answers)- Updated 2025 November 2009 English Language Paper 1 (Without Answers)- Updated 2025