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"Structural Hierarchy of Plants" How cells constitute organisms PPT courseware 4
Review the past and learn the new
1. What structure does human growth and development start from?
2. Describe the structural levels of the animal body (human) from micro to macro?
3. What is an organization? What are organs?
1. The six major organs of plants
What parts does a complete green flowering plant consist of? What is the main function of each component?
plant organs
vegetative organs
Roots: absorb water and inorganic salts
Stem: transports substances such as water and inorganic salts
Leaves: perform photosynthesis and produce organic matter
reproductive organs
flower
fruit
seed
reproduce offspring
2. Several tissues of plants
1. Meristem
Definition: In mature plants, there are always some undifferentiated cells that retain the ability to divide throughout their lives. The tissue composed of such a group of cells is called a meristem.
Distribution: The meristem zone at the tip of the root and the tip of the shoot belongs to the meristematic tissue.
Characteristics: Small cells, thin cell walls, large nuclei, dense cytoplasm, and strong ability to divide.
How are plant tissues formed?
The cells of the meristematic tissue continue to divide to produce new cells, which then differentiate to form other tissues.
In addition to meristems, the main tissues of plants include protective tissues, vegetative tissues, conductive tissues, etc.
1. I will choose.
( ) 1. In a box of apples, the first ones to rot are often those with damaged peels. This shows that the main function of the peels is
A. Protection B. Conduction C. Nutrition D. Division
( ) 2. Among the structures between roots, those with the ability to divide are meristems.
A. Root cap B. elongation zone C. meristematic zone D. mature zone
( )3. The tissues that run through the roots, stems, leaves and other organs of the plant are
A. Protective tissue B. Conductive tissue C. Nutritional tissue D. Meristem tissue
practise
1. Choice:
1. When eating watermelon, the edible “red” pulp part is actually ( )
A. An epithelial tissue B. A nutritional tissue C. An organ D. A system
2. Which of the following structures does not belong to an organization ( )
A. Leaf epidermis B. Tomato pulp
C.Peanut seeds D.Apple peel
3. The composition of green flowering plants is ( )
A. Cell → Organ → Tissue → Plant
B. Tissue → Organ → Cell → Plant
C. Cell → tissue → organ → plant body
D. Organ → tissue → cell → plant body
4. A wheat plant is composed of six organs: ________, _______, ______, ______, ______, and ______.
Where are the protective tissues located in the plant body?
Mainly distributed on the surface of various plant organs.
What tissues run through the roots, stems, and leaves of plants?
Conveying tissue.
If you pinch off the top of a branch, will the branch continue to grow? Why?
cannot.
Because there is meristem tissue at the top of the branch, when the meristem tissue is pinched off, the cells cannot divide and increase in number, and the branch cannot continue to grow upward.
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