"Leaves of Plants" PPT download

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Plant leaves PPT download

Part One Content: Exploration Activities

Kind tips:

Find a potted plant with leaves and water it well.

Cover the plant's branches and leaves with a clear plastic bag and tie the bag tightly.

Place the plant in a sunny location and pay attention to the phenomenon.

in conclusion:

The small water droplets on the plastic bag may be caused by the excess water in the plant absorbing the surrounding heat, turning into water vapor, escaping from a certain hole in the leaves, and condensing when it encounters cold.

Part Two: Expanding Applications

Thinking: What significance does "leaf transpiration" have on plant life and nature?

The functions of leaf transpiration of water are:

Since evaporation absorbs heat, just like people sweating can cool down and regulate body temperature, the transpiration of plants can make plants "cool" in hot summer and prevent them from being scorched.

Due to the transpiration of water, the water in the plant body decreases. This can promote the roots to continuously absorb water and nutrients.

Can make the air moist.

Part Three: Complying with Standards in the Hall

1. Fill in the blanks.

1. There are many small holes in the lower epidermis of the leaves for gas to enter and exit, called _______.

2. The water in the plant ______ the heat around it, which turns into ______ and escapes from the ______ of the leaves and soars into the air. This effect of leaves is called ______ effect.

3. In summer, plants can become cooler through ______ and avoid being scorched by the sun.

2. Petty Judge.

1. The more and larger the leaves of the plant, the stronger the transpiration, which is harmful to the growth of the plant. ( )

2. The temperature in winter is low, and the leaves of plants will not have transpiration in winter. ( )

3. When people take cuttings or transplant trees, they often cut off part of the branches and leaves. This can reduce the transpiration of the plants and make it easier for the trees to survive. ( )

Three, I will choose.

1. In summer, the transpiration of plants is strong, and the roots are removed from the soil ( ). In autumn, the transpiration of leaves is weakened, and the roots are removed from the soil ( ).

A. Less water absorbed. B. More water absorbed. C. No water absorbed.

2. The water in the plant absorbs the surrounding heat and turns into water vapor and escapes from ( ).

A. Both sides of the leaf B. Stomata on the upper epidermis of the leaf C. Stomata on the lower epidermis of the leaf

3. Put a pot of flowers in the shade, the leaves of this pot of flowers ( ).

A. Transpiration proceeds quickly. B. Transpiration proceeds slowly. C. Transpiration does not occur.

Keywords: Qingdao edition fourth grade science PPT courseware free download, plant leaves PPT courseware, .PPT format;

For more information about the "Leaves of Plants" PPT courseware, please click on the "Leaves of Plants" PPT tab.

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"Plant Leaves and Transpiration" PPT:

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Update Time: 2024-10-31

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