Fifth Grade Science Volume 1, Textbook Edition
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Science Edition for Sixth Grade Science Volume 1
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Third Grade Science Volume 1, Textbook Edition
Fourth Grade Science Volume 2, Textbook Edition
Fourth Grade Science Volume 1, Textbook Edition
Fourth-grade science volume 2 of the E-education edition
Qingdao Edition Fourth Grade Science Volume 2
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E-education edition fifth grade science volume 1
E-education edition fifth grade science volume 2
E-education edition sixth grade science volume 1
Fifth Grade Science Volume 2, Textbook Edition
Qingdao Edition Fourth Grade Science Volume 1
Zhejiang Education Edition Seventh Grade Science Volume 2
Category | Format | Size |
---|---|---|
Zhejiang Education Edition Eighth Grade Science Volume 2 | pptx | 6 MB |
Description
"Plant Stems and Material Transport" PPT
Part 1: The structure of the stem
1. Classification of stems
According to form:
①Erect stem
Features: The stem is relatively strong and can stand upright.
Camphor tree, sugar cane
②Twining the stem
Features: Use the stem itself to wrap around other objects and rise up
morning glory, ivy
③ stolons
Features
The stem is soft and lies flat on the ground.
Strawberries, sweet potatoes
④ Climbing stem
Features
Grow upward by means of abnormal structures (such as tendrils) on stems and leaves.
Grapes, cucumbers
Difference: According to the development of wood in the stem, the stem can be divided into herbaceous stem and woody stem. The woody part of the herbaceous stem accounts for very little and is relatively fragile. The stem becomes inverted after the plant dies. Plants with herbaceous stems are called herbs and are often called "grasses". Most monocots are herbs. Most of the woody stem is composed of xylem, which is very hard. The stem can still stand upright after the plant dies. Plants with woody stems are called woody plants and are often called "trees".
2. Stem structure
Outside: The cells are arranged __________, the intercellular spaces are relatively __, and play the role of __________,
Inner side: phloem
Bast fiber: supportive
Sieve tubes: transport organic matter
Xylem: located in the __________ of the stem, including:
①The larger cells are ____ and have the function of __________;
②The smaller cells are __________ (hard and have strong supporting force)
Plant stems and material transport PPT, part 2: annual rings
1. The formation of annual rings
Internal factors: caused by the intensity of cambium splitting activity.
External factors: cyclical changes in climate.
2. Determine tree age based on annual rings
3. Determine the climate environment at that time based on the growth rings
4. Determine the direction based on annual rings
The side with sparse lines faces south, and the side with dense lines faces north.
5. Determine the environmental pollution at that time based on the "spots" on the annual rings
Pollutants in the environment are sucked into and fixed in the growth rings of different years. By analyzing the growth rings through advanced technology, we can know the nature and extent of the pollution.
Plant stems and material transport PPT, part three: summary
1.Classification of stems
stem shape
Upright stem The stem is relatively strong and can stand upright.
Stolons lie flat on the ground and spread around with adventitious roots.
Wrap the stem, use the stem itself to wrap around and rise
Climbing stem Uses tendrils to climb something up
stem composition
woody stem
Herbaceous stem
2. Structural characteristics of dicotyledonous plant stems:
Structure of dicotyledonous plant stems
bark
Outer bark protection
inner bark
(The inside is the phloem)
Sieve tubes transport organic matter
Bast fiber
Cambium cells can divide and proliferate
xylem
Catheters carry water and inorganic salts
Wood fiber increases stem strength
Keywords: Zhejiang Education Edition eighth grade science PPT courseware for the second volume free download, plant stems and material transport PPT download, .PPT format;
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File Info
Update Time: 2024-10-19
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