Year 11 - Science
Plant roots are adapted to absorb water and mineral ions
Transport and exchange surfaces in plants
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit covers water and mineral uptake in plants, focusing on root hair cells, xylem, and phloem. It includes transpiration, translocation, and factors affecting water uptake. Emphasis is on rate calculations, graph interpretation, experiments, and data analysis.
Lesson Summary
You will learn to explain how water and mineral ions are absorbed into specialised root hair cells that are adapted to maximise absorption.
Key Notes
- Plants need water for support (to remain turgid) because they don't have bones, and for photosynthesis in cells.
- Plants need mineral ions for growth and repair, including nitrate ions as a source of nitrogen to make proteins.
- Particles of water are absorbed by osmosis, a type of diffusion, into plant root hair cells.
- Nitrate ions are absorbed into plant root hair cells by active transport, which requires energy.
- Root hair cells are adapted to increase the surface area of membrane for osmosis and active transport.
Vocabulary To Learn
- osmosis: the net movement of water molecules through a selectively-permeable membrane from high to low concentration of water molecules
- net movement: the overall movement of particles
- active transport: the net movement of particles against a concentration gradient using energy
- concentration gradient: a difference in the concentration of particles from one area to another
- root hair cell: a specialised plant cell found in the roots that absorb water and nutrients into the plant
Common Mistakes To Avoid
- Some students do not realise the significance of the shape of the root hair cell and do not explain this in terms of increasing its surface area.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Plants need water for support (to remain turgid) because they don't have bones, and for photosynthesis in cells. Plants need mineral ions for growth and repair, including nitrate ions as a source of nitrogen to make proteins.
2. Define this scientific word and use it in context. 'osmosis'
the net movement of water molecules through a selectively-permeable membrane from high to low concentration of water molecules. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Some students do not realise the significance of the shape of the root hair cell and do not explain this in terms of increasing its surface area. Correction: The idea of surface area as the significant adaptation of root hair cells is clearly introduced, checked, and reinforced with specific tasks that explicitly enquire about this adaptation.
More Lessons In This Unit
- Observing root hair cells using a light microscope: practical Study Guide
- Observing the structure and distribution of stomata: practical Study Guide
- Observing xylem and phloem using a light microscope: practical Study Guide
- The effect of light on water uptake by a plant: practical Study Guide
- The effects of environmental factors on the rate of water uptake by a plant Study Guide
- The importance of exchange surfaces and transport systems in plants Study Guide
- Transport systems in plants: phloem and translocation Study Guide
- Transport systems in plants: xylem and transpiration Study Guide
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