Observing the structure and distribution of stomata: practical
I can use a light microscope to observe imprints of stomata and investigate their distribution on leaves.
Observing the structure and distribution of stomata: practical
I can use a light microscope to observe imprints of stomata and investigate their distribution on leaves.
These resources will be removed by end of Summer Term 2025.
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.
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
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.
Equipment
light microscope, leaf, nail varnish and brush, clear sticky tape, microscope slide
Content guidance
- Risk assessment required - equipment
Supervision
Adult supervision required
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
Loading...