waec model questions vol1 2025 biology | Practical

Are you preparing for waec model questions vol1 exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2025 biology (Practical) questions designed to simulate the real exam environment.

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Question 1
You are provided with a microscope and a prepared slide of onion epidermis. Describe the procedure you would follow to observe the cell structure under the microscope. Include details on how to prepare the slide if necessary, and how to adjust the microscope for optimal viewing.
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Question 2
A student is investigating the process of mitosis in onion root tips. Describe the steps the student should take to prepare the root tip for observation under the microscope, including any necessary staining techniques.
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Question 3
A group of students conducted an experiment to investigate the effect of varying concentrations of a sugar solution on the rate of osmosis in potato cells. They prepared five different concentrations of sugar solution (0%, 5%, 10%, 15%, and 20%) and cut equal-sized potato cylinders, measuring 5 cm in length and 1 cm in diameter. After immersing the potato cylinders in the solutions for 30 minutes, they measured the final mass of each potato cylinder. The results are recorded in the table below: | Concentration (%) | Initial Mass (g) | Final Mass (g) | |-------------------|------------------|----------------| | 0 | 20 | 22 | | 5 | 20 | 21 | | 10 | 20 | 20 | | 15 | 20 | 18 | | 20 | 20 | 16 | (a) Calculate the percentage change in mass for each concentration of sugar solution. (b) Based on your calculations, explain how the concentration of the sugar solution affects the rate of osmosis in potato cells. (c) Discuss two potential sources of error in this experiment and suggest how these can be minimized.
Question Parts
(a)
Calculate the percentage change in mass for each concentration of sugar solution.
(b)
Based on your calculations, explain how the concentration of the sugar solution affects the rate of osmosis in potato cells.
(c)
Discuss two potential sources of error in this experiment and suggest how these can be minimized.
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Question 4
A student set up an experiment to investigate the effect of temperature on the rate of respiration in yeast. The student prepared a glucose solution and added yeast to it. The setup included a test tube filled with the mixture, a water bath to maintain different temperatures, and a manometer to measure the volume of carbon dioxide produced. The experiment was conducted at 10°C, 20°C, 30°C, 40°C, and 50°C. After 30 minutes, the volume of carbon dioxide produced at each temperature was recorded as follows: | Temperature (°C) | Volume of CO2 produced (cm³) | |-------------------|------------------------------| | 10 | 5 | | 20 | 15 | | 30 | 30 | | 40 | 25 | | 50 | 10 | (a) Plot a graph of temperature against the volume of carbon dioxide produced. (b) Describe the trend shown in the graph and explain the biological significance of the observed trend. (c) Identify one limitation of this experiment and suggest how it could be improved.
Question Parts
(a)
Plot a graph of temperature against the volume of carbon dioxide produced.
(b)
Describe the trend shown in the graph and explain the biological significance of the observed trend.
(c)
Identify one limitation of this experiment and suggest how it could be improved.
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