"Green Plants and the Water Cycle of the Biosphere" PPT Courseware 6

"Green Plants and the Water Cycle of the Biosphere" PPT Courseware 6

1. Plants’ absorption and transportation of water

1. Where does the plant absorb water?

2. What is the transport pathway of water within the stem?

3. How is water transported within plants?

Plants absorb water primarily through their roots. The main part of the root that absorbs water is the mature zone at the root tip. There are a large number of root hairs in the mature zone, which gives the root tip a huge absorption area and therefore a strong water absorption capacity.

The red-stained parts of the stem's transverse and longitudinal sections look like long tubes. This is the transport structure of water in the stem - the conduit, which is a conductive tissue.

The cells that make up the ducts have no cytoplasm and nucleus, and the cell walls between the upper and lower cells have disappeared, forming a hollow tube.

Plants have vessels in their roots, stems, and leaf veins.

Water is an important component of plants.

When there is sufficient water in the plant, the plant can be stiff and maintain an upright posture; the leaves can stretch, which is conducive to photosynthesis.

Only when inorganic salts are dissolved in water can they be absorbed by the plant body and transported to various organs of the plant body.

2. Transpiration of plants

What is Transpiration?

Transpiration is the process by which water escapes from the stomata of plants in the form of gas.

Transpiration is mainly carried out through leaves, so if you want to know how plants lose water through transpiration, you must also understand the structure of leaves.

Observe the structure of the leaves

Purpose requirements:

1. Practice slicing with your bare hands

2. Understand the structure of blades

3. Draw a diagram of the epidermal cells and guard cells of the leaf

Materials and tools: (omitted)

Method steps:

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

2. Observe the structure of the leaves

3. Observe the lower epidermis of the leaves

The significance of plant transpiration

1. Promote the absorption and upward transport of water and inorganic salts by plants,

2. Transpiration can increase atmospheric humidity, increase precipitation, and participate in the water cycle of the biosphere.

3. Transpiration can also lower the temperature of plants.

4. Green plants stabilize nature’s water cycle.

4. Green plants participate in the water cycle of the biosphere

Think and discuss:

1. Describe the process of water cycle on Earth.

2. The role of green plants in the water cycle.

The role of green plants in the water cycle:

1. The transpiration of green plants can increase the humidity of the atmosphere and increase rainfall;

2. The stems and leaves of plants absorb rainwater and can greatly slow down the erosion of the ground by rainwater;

3. Litter leaves in the woods can absorb a large amount of rainwater, seep into the ground, and replenish groundwater.

practise

1. Determine whether the following statements are correct or not. If the statement is correct, draw “” and if the statement is incorrect, draw “”.

(1) Plants lose a lot of water through transpiration, which is a waste. ( )

(2) The stomata of plants are very small, so very little water is lost through the stomata. ( )

(3) In plants, water flows to higher places, which is mainly driven by transpiration. ( )

2. When planting trees in spring, a large number of branches and leaves are often cut off from transplanted saplings. Why is this?

Because the leaves will lose a lot of water through transpiration, causing the saplings to die due to lack of water, a large number of branches and leaves need to be pruned.

Keywords: Green Plants and the Biosphere's Water Cycle Teaching Courseware, People's Education Edition 7th Grade Biology PPT Courseware Download, Seventh Grade Biology Slide Courseware Download, Green Plants and the Biosphere's Water Cycle PPT Courseware Download, .PPT format;

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