Plant Biology

Where this fits in the syllabus

Grade 11 · Term 2

Key points to revise

Revise Plant Biology fast with concise, exam-ready key points

About O/L Science: O/L Science integrates physics, chemistry, and biology into a single subject across Grade 10 and 11.

• Transpiration: water loss via stomata (evaporation); drives water up xylem
• Xylem: carries water and minerals UP from roots; dead cells with lignin
• Phloem: carries sucrose/sugars UP and DOWN; living cells (translocation)
• Phototropism: shoots grow toward light (positive); roots away (negative) — mediated by auxin

Must know

• Factors affecting transpiration: temperature, humidity, wind, light intensity
• Auxin: causes cell elongation; phototropism — shoots bend toward light
• Root hair cells: large surface area; absorb water by osmosis
• Germination requires: water, warmth, oxygen

Source: NIE O/L Science Grade 10 — Unit 4: Plant Biology

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In the Syllabus