- 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.
- The Mystery of the Evolution of Stomata
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.
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.
- Onion cell
- Try other plant materials and parts. What can you observe about the cells?
Purple tradescantia (https://en.wikipedia.org/wiki/Tradescantia_pallida)
- Your “tree”
- Other–if you don’t know the name–sketch, photo, and describe
- Another link between our study of photosynthesis and plant AND human impact on the environment–understanding climate change
- Check out the pictures in this figure:
- You might be interested in the parent article for the figure above:
- “Origins and Evolution of Stomatal Development”
Human Impact articles:
- Concrete: the most destructive material on Earth
- New way to turn carbon dioxide into coal could ‘rewind the emissions clock’
- Hundreds of Young Protesters Confront McConnell Over Green New Deal
- Swedish student leader wins EU pledge to spend billions on climate