Biology
Daily Exam Challenge: Biology (Higher)
Instructions
- • Use black ink or black ball-point pen. Draw diagrams in pencil.
- • Answer all questions in the spaces provided.
- • Do all rough work in this question paper. Cross through any work you do not want to be marked.
- • Show all your working out — marks may be awarded for correct working even if the answer is wrong.
Information
- • The total mark for this paper is 24.
- • The marks for each question are shown in brackets — use this as a guide as to how much time to spend on each question.
- • Questions labelled with an asterisk (*) are where the quality of your written communication will be assessed.
Answer all questions in the spaces provided.
*A student investigates the effect of surface area to volume ratio on the rate of diffusion using agar cubes of different sizes soaked in acid. (a) Describe how the experiment should be carried out. (b) Explain the expected results. (c) Relate this to why single-celled organisms do not need a transport system but multicellular organisms do.
Evaluate the use of stem cells in treating human diseases. Discuss the scientific, ethical, and practical considerations.
The graph shows how the population of a predator and prey species change over time in an ecosystem. A disease kills 50% of the predators at time X. Predict and explain the changes to both populations in the 12 months following time X.
End of Questions
Total marks: 24