IP Combined Science Notes (Lower Sec, Year 1-2): 06) Transport Systems in Humans & Plants
11 Dec 2025, 00:00 Z· Last updated 30 Nov 2025
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Q: What does IP Combined Science Notes (Lower Sec, Year 1-2): 06) Transport Systems in Humans & Plants cover?
A: Track nutrient and gas transport in humans and plants, including circulation, transpiration, and phloem flow calculations.
Transport systems move substances efficiently over distances too large for diffusion alone. Understand structure-function relationships to explain oxygen delivery, sugar transport, and water movement.
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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Learning targets
- Describe the structure of the human circulatory system and pathway of blood flow.
- Use cardiac output formulas to solve numerical problems and compare fitness levels.
- Explain the roles of xylem and phloem, including adaptations for their functions.
- Analyse factors affecting transpiration rate and interpret potometer data.
1. Human circulatory system
Key components: heart (four chambers), blood vessels (arteries, veins, capillaries), and blood.
| Vessel | Structure | Function |
| Artery | Thick muscular walls, small lumen. | Carry blood away from heart under high pressure. |
| Vein | Thinner walls, large lumen, valves present. | Return blood to heart at low pressure. |
