28 February Science 8 Stomata; Chloroplasts–Microscopic examination of leaves and other plant parts–plant cells

  • Mindful moment.
  • Past classes review (DSN–preparing for Parent-Student-Teacher conference–see previous blog)
  • Preview plan for the day in the class blog.
  • Prepare DSN entry.
  • Questions. Share reflections.

Examination of plant material under the microscope.

The purpose is to examine and contemplate the cellular organization of living things. Because green plants carry out photosynthesis, we want to witness first hand the structures that are involved. (Stomata; Chloroplasts, for example.) Remember that photosynthesis takes place in the cells.

Find out what you can about plant cells: http://thebiologyprimer.com/cell/

It’s fun to think of the scale of things and how the accumulated effect of the actions of all the photosynthesizing plant cells in the world, impact the earth. Carbon, oxygen, and water cycles all are affected by photosynthesis. https://micro.magnet.fsu.edu/primer/java/scienceopticsu/powersof10/

  • Taking a sample and making a slide. Directions and demonstration in class.
  • Work carefully and neatly. Clean up as you go. Return supplies to dispensing area clean and dry.
  • Take care with sharp tools.
  • Take care with microscopes. Do not use the highest power unless checked by Dr. F.
  • Keep water and plant material off the microscope. Do not touch the lenses.

Things to try:

  • Peel from section of onion bulb (see if there is a difference in an inner peel and an outer peel). http://www.microscopy-uk.org.uk/mag/indexmag.html?http://www.microscopy-uk.org.uk/mag/artfeb11/wd-onion1.html
  • Peel from leaf–top and bottom.
  • Cross section.
  • Longitudinal section.
  • Squash–onion root tip.
  • Mung bean sprout–root tip.
  • Look at a section of your leaf–top and bottom. Then you may try to make a peel.
  • https://www.microscopemaster.com/leaf-structure-under-the-microscope.html


Photomicrographs (iphone) above made from leaf peel of Tradescandia in just a few minutes. You can make out stomata and the cell structure of the leaf surface.

Make sketches to show what you see AND the orientation of the sample from the source.

Try to take photos. These should be labelled. If you get a good set, make a pic-collage with captions.

Purple tradescantia (https://en.wikipedia.org/wiki/Tradescantia_pallida)

Human Impact articles:


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