Biology 5090/11 Oct Nov 2024 | Cambridge O-Level Past Papers With Mark Scheme

1. Cell Structure & Biological Molecules | Plant vs. Animal Cells & DNA Composition – Identifying plant-specific organelles, classifying taxonomy, and understanding macromolecule structures.

2. Enzymes & Digestion | Amylase Activity & Protein Breakdown – Interpreting enzyme reaction graphs, analyzing pH effects on protease, and explaining absorption in the small intestine.

3. Photosynthesis & Gas Exchange | Leaf Structure & Limiting Factors – Determining photosynthetic limitations, identifying non-photosynthetic cells, and tracing water movement in plants.

4. Circulatory & Respiratory Systems | Heart Function & Gas Transport – Understanding vein blood flow, explaining oxygen uptake, and predicting leg swelling due to circulation.

5. Immunity & Disease Prevention | Antibodies & HIV Reduction – Defining immune responses, recognizing vaccine benefits, and explaining antibiotic effectiveness.

6. Nervous System & Hormonal Regulation | Reflex Arcs & Endocrine Control – Identifying neuron pathways, calculating pupil response percentages, and explaining adrenaline’s role.

7. Genetics & Reproduction | Variation & Inheritance Patterns – Solving probability in genetic disorders, identifying mitotic phases, and differentiating continuous vs. discontinuous traits.

8. Ecosystems & Environmental Impact | Food Chains & Rainforest Destruction – Analyzing trophic levels, explaining decomposition rates, and evaluating human impacts on biodiversity.