"Green Plants and the Water Cycle of the Biosphere" PPT Courseware 3

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"Green Plants and the Water Cycle of the Biosphere" PPT Courseware 3

[Independent Exploration 1] Plants’ absorption and transportation of water

As the saying goes, "the roots are deep and the leaves are flourishing." Where is the main part of the root that absorbs water? How is water transported to other parts of the plant after entering the root?

1. Root absorption of water

The main part of the root that absorbs water: the _______ at the root tip. There is a large amount of _____ growing there, which increases the ______ for the roots to absorb water.

2. Transport of moisture

(1) Experiment: Take a section of _____ stem, put it into water with a few drops of red ink, and irradiate it under ______ for 3 to 4 hours. You will see ______ turn red; cut the stem lengthwise If you turn it on, you will find that ______ turns red.

(2) Duct: It is composed of many ____________ cells. The _______ between the upper and lower cells has disappeared, forming a hollow tube. In addition to the stem, there are also ducts in the ______, which are connected through each other.

(3) Transportation of water and inorganic salts: After roots absorb ______ and _______, they are transported to various parts of the plant through ______ in roots, stems, and leaves.

(4) Pathways for plants to transport substances:

a) Catheter: carries _____ and _____ from bottom to top.

b) Sieve tube: transports _____ produced by photosynthesis of leaves from top to bottom.

[Independent exploration 2] Observe the structure of leaves

What is the main organ through which plants lose water? What is its structure?

1. Practice slicing with your hands and make temporary slices of cross-sections of leaves.

(1)Put the fresh leaves ______ on the small wooden board.

(2) Pinch the side-by-side __________ with your right hand and quickly cut across the leaves.

(3) Every time you make a cut, dip the blade in water and put the cut ______ into the water.

(4) Use a brush to dip a piece of ______ into it to make __________.

【Cooperation and exchange】

1. When transplanting saplings, flower seedlings and vegetables, why are there lumps of soil at the roots?

Protect root hairs and young roots and improve plant survival rate.

2. Are duct cells living cells? Why?

Tubes are tubes formed by many long, tubular cells with the cell walls disappearing between them. There is no cytoplasm or nucleus, so duct cells are dead cells.

3. Why do we need to cut the leaves into slices before we can observe their structure?

The material to be observed with a microscope must be thin and transparent. The leaves are opaque and cannot be observed. Thin and transparent slices must be made for observation.

4. Functionally speaking, what tissues do the ducts and sieve tubes in the epidermis, mesophyll and leaf veins belong to?

The epidermis is a protective tissue, the mesophyll is a nutritional tissue, and the ducts and sieve tubes in the leaf veins are conductive tissues.

5. In the leaves of land plants, do the upper epidermis and lower epidermis have the same number of stomata? Why?

The lower epidermis of land plants has many stomata, which can reduce water loss.

Go into life

1. In the hot summer, the leaves of most plants are not damaged by high temperature. What is the reason?

Plants lower their body temperature through transpiration.

2. Why is it usually necessary to transplant plants on rainy days and remove some branches and leaves?

Reduce the transpiration of plants and increase survival rate.

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For more information about the "Water Cycle of Green Plants and Biosphere" PPT courseware, please click the "Water Cycle of Green Plants and Biosphere" ppt tag.

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Update Time: 2024-10-16

This template belongs to biology courseware People's Education Edition seventh grade biology volume 1 industry PPT template

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