Exam skills
What the paper asks you to do
- Interpret limiting-factor graphs
- Explain leaf adaptations as cause-and-effect links
- Plan starch-testing investigations
Plant biology
Plant nutrition
Relate leaf structure, limiting factors and mineral requirements to photosynthesis and plant growth.5090 syllabus routeConcept · skill · exam language
What to know
Build the topic around four anchors.
- 01Photosynthesis equation
- 02Leaf adaptations
- 03Limiting factors
- 04Nitrate and magnesium ions
Common mistakes
Where marks disappear
- Saying plants obtain food from soil
- Confusing respiration with photosynthesis
- Listing stomata without explaining gas movement
Structured practice
Answer these without looking back.
For each prompt, write the biological chain clearly enough that every mark-worthy link is visible.
- 01Explain two adaptations of a palisade layer.
- 02Interpret a light-intensity graph.
- 03Describe a test showing light is needed for photosynthesis.
Continue learning
Use the complete resource route.
Open the student materials, official syllabus or the next topic in sequence.
This independent teaching resource follows the Cambridge O Level Biology 5090 syllabus direction and is not endorsed by Cambridge International Education.