Starter quiz
- Which process occurs in the chloroplasts of plant cells?
- 'photosynthesis' ✓
- A light ______ is used to magnify small objects in the lab.
- 'microscope' ✓
- Which part of the plant cell is responsible for water loss regulation?
- chloroplast
- mitochondria
- nucleus
- stomata ✓
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- What is transpiration in plants?
- the process of nitrogen fixation
- the process of photosynthesis
- the process of respiration
- the process of water loss through stomata ✓
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- Why is it important for stomata to be able to open and close?
- to absorb nutrients
- to produce food
- to regulate gas exchange and water loss ✓
- to transport water
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- Which gas is released by plants during photosynthesis?
- 'oxygen' ✓
Exit quiz
- What does the term 'magnification' mean in microscopy?
- the brightness of the light source
- the clarity of the image
- how many times larger the viewed object is than its actual size ✓
- the size of the lens
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- What is the purpose of using nail varnish in the stomata experiment?
- to colour the leaf
- to create an imprint of the stomata ✓
- to make the leaf waterproof
- to protect the leaf
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- Where are stomata more commonly found on a leaf?
- equally on both surfaces
- on the edges
- on the lower surface ✓
- on the upper surface
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- How does stomatal density relate to a plant's environment?
- Plants in dry environments have fewer stomata to conserve water. ✓
- Plants in dry environments have more stomata for increased gas exchange.
- Stomatal density is higher in humid environments.
- Stomatal density is the same regardless of environment.
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- Calculate the stomatal density if 20 stomata are found in an area of 0.1 mm².
- 2000 stomata per mm²
- 200 stomata per mm² ✓
- 20 stomata per mm²
- 2 stomata per mm²
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- If a plant has a stomatal density of 100 stomata per mm² and the leaf area is 10 mm², how many stomata are on the leaf?
- '1000' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning 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.
- 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.
Common misconception
Thinking that plants have stomata in equal numbers on every surface of their leaves.
Through practical work and data analysis, pupils explore the distribution of stomata on the top and bottom surfaces of leaves.
Keywords
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
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