Year 11 - Science
Observing the structure and distribution of stomata: practical
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 use a light microscope to observe imprints of stomata and investigate their distribution on leaves.
Key Notes
- The parts of a light microscope and their functions.
- The sequence of steps for setting up a microscope to observe specimens, including changing the magnification and focus.
- The steps of applying nail varnish and clear sticky tape to a leaf surface, then observing imprints of stomata.
- Light microscopy can be used to observe and compare the density and distribution of stomata on different leaf surfaces.
- Explaining observations of stomatal density using ideas about transpiration and water loss.
Vocabulary To Learn
- light microscope: an instrument that uses visible light and lenses to magnify a viewed specimen
- lens: a glass or plastic disc that refracts light to increase magnification
- focus: to make an image sharper and clearer
- magnification: the number of times greater in size the viewed object is compared to its actual size
- stomata: pores in the leaf through which water, oxygen and carbon dioxide can diffuse
Common Mistakes To Avoid
- Thinking that plants have stomata in equal numbers on every surface of their leaves.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
The parts of a light microscope and their functions. The sequence of steps for setting up a microscope to observe specimens, including changing the magnification and focus.
2. Define this scientific word and use it in context. 'light microscope'
an instrument that uses visible light and lenses to magnify a viewed specimen. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Thinking that plants have stomata in equal numbers on every surface of their leaves. Correction: Through practical work and data analysis, pupils explore the distribution of stomata on the top and bottom surfaces of leaves.
More Lessons In This Unit
- Observing root hair cells using a light microscope: practical Study Guide
- Observing xylem and phloem using a light microscope: practical Study Guide
- Plant roots are adapted to absorb water and mineral ions 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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