"Green Plants and the Water Cycle of the Biosphere" PPT Courseware 7

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"Green Plants and the Water Cycle of the Biosphere" PPT Courseware 7

1. Plants’ absorption and transportation of water

Self-learning:

There are white "hairs" on the young roots. Root hairs. What are the characteristics of root hairs?

A large number of root hairs can increase the surface area for roots to absorb water and improve the root's ability to absorb water.

How is the water absorbed by the roots transported to stems, leaves, flowers and other organs? P109

2. Transpiration of plants

What is Transpiration?

The process by which water is lost from the surface of living plants to the atmosphere in the form of water vapor is called transpiration.

Water in plants is lost through _________.

Thinking: 1. The main organ of plant transpiration is: ______.

2. Most of the water absorbed by plants is used for _______.

Summary: The significance of transpiration to plants

Transpiration (creating an upward pull) promotes the absorption and transport of water

Transpiration (generating an upward pull) promotes the transport of inorganic salts within the plant

Transpiration reduces the temperature on the surface of plant leaves and prevents strong sunlight from burning the plants

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

1. According to the latest estimates, forests can transfer 50%-80% of precipitation underground, and one hectare of forestland can store 3,000 cubic meters more water than bare land.

2. According to scientific calculations, the rainfall in a certain tropical rain forest is 1950 mm/year, and the transpiration is 1570 mm/year. Transpiration accounts for 80% of rainfall.

After reading these two pieces of information, what new insights do you have about the role of green plants in the natural water cycle?

The role of green plants in the biosphere water cycle

1. Green plants promote the water cycle of the biosphere through transpiration.

2. Green plants can maintain soil and water and conserve water sources.

3. Green plants increase atmospheric humidity and increase rainfall through transpiration.

practise

1. Determine whether the following statements are correct or not. If correct, draw “” and if 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 the 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;

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: 2024-09-08

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

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