"Transpiration" PPT

Description

"Transpiration" PPT

Part One: Teaching Objectives

Knowledge goal

Describe the transpiration phenomenon of plants, explain the main reasons for water loss in plants, and explain the significance of transpiration to plant life.

Competence goals

Through the demonstration experiment of observing plant transpiration and water loss, students can develop their experimental skills, observation skills and analytical skills.

Emotion goal

By learning the process of transpiration and other related knowledge, we can establish the perspective of plants adapting to the external environment, enhance ecological awareness, and improve their understanding of greening the motherland and protecting the environment. Combined with the observation experiment of plant transpiration and water loss, it stimulates students' strong interest in life science research.

Textbook analysis

Transpiration is an important physiological activity of green plants. It plays a vital role in maintaining the water content of plants and reducing the temperature of plants during high temperature seasons. The textbook builds knowledge about the transpiration of green plants by starting from experimental observations of the transpiration phenomenon of plants, so that students can be convinced that plants have transpiration, and then guides students to understand the concept, process and meaning of transpiration.

Transpiration PPT, Part 2: The concept of transpiration:

Concept: The physiological process in which water in a plant body is lost to the outside of the body in the form of water vapor.

Transpiration of water mainly occurs on the leaves, but can also occur in small amounts on petioles and young stems.

The process of transpiration

Pathway: water in the soil → root hairs → vessels of roots, stems and leaves → mesophyll cells → stomata → atmosphere

Only 1% to 5% of the water absorbed by plants is retained or utilized in the plant body, and the rest is lost outside the body. Transpiration is the main way for plants to lose body water.

The meaning of transpiration:

Promote water absorption by roots

Promote the transportation of water and inorganic salts in plants.

Reduce the temperature of the plant body to avoid burns.

Transpiration PPT, Part 3: Class Summary

1. The concept of transpiration:

The physiological process in which water in a plant body is lost to the outside of the body in the form of water vapor.

2. The process of transpiration:

Water in the soil → root hairs → vessels of roots, stems and leaves → mesophyll cells → stomata → atmosphere

3. The significance of transpiration:

1. Promote water absorption by roots.

2. Promote the transportation of water and inorganic salts in plants.

3. Reduce the temperature of the plant body to avoid burns.

Keywords: Beijing Normal University edition seventh grade biology PPT courseware free download, Transpiration PPT download, .PPT format;

For more information about the PPT courseware "The Lifestyle Transpiration of Green Flowering Plants", please click the "The Lifestyle Transpiration of Green Flowering Plants ppt" ppt tag.

"Plant Leaves and Transpiration" PPT courseware:

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"Plant Leaves and Transpiration" PPT:

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"Transpiration" PPT courseware:

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Update Time: 2024-10-19

This template belongs to biology courseware Beijing Normal University Edition Seventh Grade Biology Volume 1 industry PPT template

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