| Category | Format | Size |
|---|---|---|
| E-education edition fifth grade science volume 1 | pptx | 6 MB |
"Treads in Trees" Walking into the Woods PPT Courseware
Description
"Treads in Trees" Walking into the Woods PPT Courseware
Looking at a cross-section of a tree stump, what do you find?
There are many lines on the cross section of the tree stump.
The colors of these lines vary from dark to light.
Our questions:
1. Why are there so many lines in the tree trunk?
2. Do other tree trunks have so many lines?
3. Why are the textures in tree trunks different in color?
There are several layers of cells between the bark and the xylem of the trunk. These layers of cells form a circle and continue to divide into new cells, so the tree will grow longer and thicker.
In spring and summer rainy seasons, when there is sufficient rain, trees will grow rapidly and divide into more and larger cells, forming a circle of loose wood and lighter color.
Autumn and winter are dry and cold, and the dividing cells of trees slow down at this time, and the cells that divide are fewer and smaller. The resulting circle of wood is dense in texture and darker in color.
Due to the different density of wood and the different shades of color, clear circle patterns, namely annual rings, are formed.
Year after year, the growth rings continue to increase, and the saplings gradually grow taller and stronger.
extracurricular development
(1) Continue to observe the growth rings on the stumps left by logging or the sawed trunk sections.
(2) Collect information about tree rings, read it, and share the learned knowledge with your classmates.
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For more information about the PPT courseware "Into the Woods Textures in the Trees", please click the Into the Woods ppt Textures in the Trees ppt tag.
"Treads in Trees" Walking into the Woods PPT Courseware 2:
"Treads in Trees" Into the Woods PPT Courseware 2 We call the lines on the cross section of trees annual rings. Observation experiment Experiment purpose: Observe and discover the characteristics of annual rings Experiment materials: Cross sections of pine trees, tung trees, yellow lotus trees, toon trees, metasequoia trees, pine...
File Info
Update Time: 2024-07-04
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