IP Combined Science Notes (Lower Sec, Year 1-2): 04) Cells, Diffusion & Organisation
In one line
Label cell structures, explain transport across membranes, and connect tissues to organs and systems.
Last updated 30 Nov 2025
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- Start Here
- Learning targets
- 1 Cell ultrastructure
- 2 Diffusion & osmosis
Q: What does IP Combined Science Notes (Lower Sec, Year 1-2): 04) Cells, Diffusion & Organisation cover?
A: Label cell structures, explain transport across membranes, and connect tissues to organs and systems.
Understanding how substances cross membranes and how cells group into tissues helps you explain both microscopic slides and full organ systems.
These notes align with MOE's Lower Secondary Science syllabus themes commonly taught in IP Sec 1–2, and act as a bridge into upper-secondary Physics, Chemistry, and Biology.
Status: MOE Lower Secondary Science syllabus (current release) checked 2025-11-30 - scope unchanged; remains the reference for these combined science notes.
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Start Here
| Read time | What to take away |
| 1 second | Cell questions link structures to jobs. |
| 10 seconds | Learn the organelles, then explain diffusion and osmosis using gradients and membranes. Finally connect cells to tissues, organs, systems, and organisms. |
| 100 seconds | Example: a root hair cell has a long extension for large surface area, so water and mineral ions can enter more efficiently. |
Learning targets
- Identify organelles in typical animal and plant cells and state their functions.
- Compare specialised cells (root hair, red blood cell, palisade mesophyll) with structural adaptations.
- Distinguish diffusion and osmosis using concentration and water potential ideas.
- Describe how cells, tissues, organs, and systems are organised within organisms.
1 Cell ultrastructure
| Organelle |
