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"The Growth of Plants" Life of Angiosperms PPT Courseware 4
1. Growth of young roots
root growth
On the one hand, it depends on the division of cells in the meristematic zone (with meristematic tissue) to increase the number
On the other hand, the cell volume increases in the elongation zone. (The last sentence of book P97)
Classification of buds:
1. According to different locations, it can be divided into:
Terminal buds: the buds at the top of the trunk and lateral buds
Side buds: buds on one side of the main trunk and one side of the side branches
2. According to different development results, it can be divided into:
Leaf buds: develop into leaves and stems
Mixed buds: can develop into leaves or flowers
Flower bud: develops into flower
2. Buds develop into branches
There are meristems in the buds. During development, the cells of the meristems divide and differentiate into young stems, leaves and new buds.
3. Nutrients needed for plant growth
What nutrients do plants need to grow?
What is the role of fertilization?
What inorganic salts do plants need the most?
What should we pay attention to when fertilizing?
What is the role of fertilization?
Provide inorganic salts for plant growth
What inorganic salts do plants need the most?
Inorganic salts containing nitrogen, phosphorus and potassium
What should we pay attention to when fertilizing?
1. Do not apply too much fertilizer at one time, otherwise "seedling burning" will occur and even cause plant death.
2. Pay attention to watering when applying fertilizer to facilitate the absorption and transportation of fertilizer.
True or False:
1. The cell volume in the elongation zone is larger than that in the meristematic zone. ( )
2. The growth of plants refers to the increase in the number of cells, which is completed through cell division. ( )
3. There are also meristems in buds. ( )
4. The lack of a certain inorganic salt in plants generally does not affect their growth. ( )
5. Fertilizer mainly refers to organic matter for plant growth. ( )
growth of young roots
1. An experiment to explore “which part of the root grows fastest”
(1)Experimental materials: fast-growing ____________.
(2)Experimental results
①The part where roots grow fastest is ____________.
②The cells in the lower part of __________ are smaller, and the cells in the upper part are more ______.
(3) Process analysis
2. causes of root growth
(1) Cell division in the ________ zone increases the number of cells.
(2) Increase in cell volume in ________ zone.
Objective 1 Root growth and branch development process
[Breakthrough 1] Among the following statements about the growth of roots and the development of branches, which one is incorrect ( )
A. Division of cells with meristematic tissue
B． Buds on branches can develop into new branches
C. Cells in the meristematic zone are larger than cells in the elongation zone
D. The branches formed include young stems, leaves, and buds
[Breakthrough Points] The growth of roots and branches is the result of cell division in meristems. The cells in the meristematic zone of the root need to divide continuously, so the cells are smaller than the cells in the elongation zone. The buds on the branches continue to grow and can develop into new branches.
Goal 2: The relationship between inorganic salts and plant growth
[Breakthrough 2] Soilless cultivation has changed the limitations of traditional agriculture that cannot be separated from the soil. When implementing soilless culture, the nutrient solution must be replaced in a timely manner. The main purpose is to provide the necessary nutrients for plant growth ( )
A. fat b. protein
C. Inorganic salts D. vitamins
[Breakthrough Points] Soilless cultivation gets rid of the limitations of soil, but plant growth is inseparable from inorganic salts. Once a certain inorganic salt is lacking, corresponding symptoms will appear.
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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 5:
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"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...