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"The Growth of Plants" Life of Angiosperms PPT Courseware 5
Dissecting a holly branch
1. Observe the cross section of the stem and see how many layers it is divided into?
2. Peel off the bark by hand.
If you tear the bark with your hands, will it be tough?
3. Look at the inside of the bark. What color is it?
Touch it with your hand. How do you feel?
4. Prick the cross section with a dissecting needle to see which part is hard? Which part is loose?
1. What is the structure of the stem of woody plants?
stem
Bark (the inner part is called phloem)
cambium
xylem
marrow
2. Why do the stems of woody plants become thicker year by year?
Can you estimate the age of trees? ----Turning rings
1. Concept: 34 pages
Concentric rings. The color of each annual ring gradually becomes darker
2. Cause of formation: It is the result of cambium cell division activity being affected by temperature changes.
3. Count the age
Expand and extend
Sometimes we see this phenomenon: a certain part of the stem of a poplar tree by the roadside is damaged and the xylem is exposed. Just imagine, can this exposed part of the xylem be thickened? Why?
No, because the thickening growth of poplar stems is completed through the division activity of cambial cells between the bark and xylem. If the stem of a woody plant is damaged and the cambium layer is destroyed, the injured part cannot be thickened year by year.
What nutrients do plants need to grow?
The stems grow upward and produce green leaves, which produce organic matter through photosynthesis.
Roots absorb water and inorganic salts from the soil
Why are the same plants different?
Nitrogen deficiency: The plants are short and thin, and the leaves turn yellow.
Phosphorus deficiency: The plants are short and have dark green leaves.
Potassium deficiency: poor plant growth, yellowing of leaf edges or tips
Class summary
plant growth
growth of young roots
①The number of cells in the meristematic zone increases
②The cell volume in the elongation zone increases
Branches develop from buds: they are composed of young stems, leaves and buds.
Thickening of woody plant stems
Nutrients: including water, inorganic salts (mostly nitrogen, phosphorus and potassium) and organic matter.
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"The Growth of Plants" Life of Angiosperms PPT Courseware 6:
"The Growth of Plants" Life of Angiosperms PPT Courseware 6 Think about it and discuss it (page 96) A well-growing rye plant has about 14 million roots, and the total length is 600 kilometers. These roots have a total of 15 billion root hairs, with a total length of 10,000 kilometers. Precise calculations show:..
"The Growth of Plants" Life of Angiosperms PPT Courseware 4:
"Growth of Plants" Lifetime of Angiosperms PPT Courseware 4 1. Growth of young roots Root growth depends on the one hand to increase the number of cells in the meristematic zone (with meristematic tissue) and on the other hand to increase the volume of cells in the elongation zone. (The last sentence of book P97) Classification of buds: 1...
"Growth of Plants" Life of Angiosperms PPT Courseware 3:
"The Growth of Plants" Life of Angiosperms PPT Courseware 3 Think about it and discuss it. A well-growing rye plant has about 14 million roots, and the total length is 600 kilometers. These roots have a total of 15 billion root hairs, with a total length of 10,000 kilometers. Accurate calculations show that this black...