B2 Osmosis and Plant Transport
Osmosis, turgidity, plasmolysis, roots, xylem, transpiration and potometer investigations.
How to study for CCEA GCSE Double Award Science
Build each scientific explanation from a model or relationship, show quantitative working, and connect every practical claim to controlled evidence and evaluation.
Core concepts
Concept 1
Osmosis is diffusion of water through a selectively permeable membrane from a dilute to a more concentrated solution.
Exam cue: Identify the scientific model, relationship or practical evidence required by the command word.
Concept 2
Water moves from root hair cells through root tissues into xylem and is pulled through the plant in the transpiration stream.
Exam cue: State what a potometer measures directly and distinguish water uptake from actual leaf water loss.
Concept 3
Transpiration rate changes with light, temperature, air movement and humidity through their effects on evaporation and diffusion.
Exam cue: Use the current CCEA specification formatting and entered tier to decide whether Higher-only detail applies.
Risk pitfalls and guardrails
Using water concentration language inconsistently or saying water moves because the plant chooses to absorb it.
Guardrail: Do not import another board or science route, omit units from a calculation, or make a scientific claim beyond the stated evidence.
Giving a remembered fact without connecting it to the stated data, observation or scenario.
Guardrail: Do not import another board or science route, omit units from a calculation, or make a scientific claim beyond the stated evidence.
Importing content or paper structure from a separate-science or non-CCEA specification.
Guardrail: Do not import another board or science route, omit units from a calculation, or make a scientific claim beyond the stated evidence.
Memory anchors
Osmosis
Diffusion of water through a selectively permeable membrane.
Turgid
Firm plant-cell state after water enters by osmosis.
Plasmolysed
Plant-cell state in which the membrane pulls from the wall after water loss.
Xylem
Tissue transporting water and mineral ions upward through a plant.
Transpiration
Loss of water vapour from plant leaves.
Potometer
Apparatus estimating plant water uptake rate.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Which statement defines osmosis?
A potato cylinder gains mass in distilled water. Why?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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