"Flowers, Fruits and Seeds" New Life PPT Download

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"Flowers, Fruits and Seeds" New Life PPT Download

Part One: Importing New Knowledge

Why do some flowers on the same plant bear fruit while others do not?

How are the fruits and seeds of plants formed?

Flowers, fruits and seeds PPT, part 2: new knowledge explanation

What is the most important part of a flower for reproduction?

Filaments, anthers, pollen on stamens

Does pollen shake off easily?

activity exploration

Shake off the anthers on the white paper and observe whether the pollen falls easily.

Corn pollen will be blown away by the wind and fall to the stigma.

Rice and wheat pollen are also spread by wind.

Insects fly around in the flowers and inevitably come into contact with the flowers, thus transferring pollen.

Flowers, fruits and seeds PPT, part three: activity exploration

pollinate flowers

What did you find during the experiment?

Experimental equipment: stamens and pistils, cotton swabs,

Experimental steps

1. Use a cotton swab to gently touch the anthers of the stamens;

2. Then take a cotton swab and lightly apply it on the stigma of the pistil;

3. Use a magnifying glass to observe the stigma of the pistil.

Flowers, fruits and seeds PPT, part 4: Consolidation and improvement

True or False

All flowers of plants bear fruit ( )

Analysis: Male flowers cannot bear fruit, and some flowers only bloom but do not bear fruit, such as plum blossoms, sweet-scented osmanthus, etc.

Plants can only be pollinated by insects or artificially ( )

Analysis: Some flowers rely on wind to help complete pollination, such as corn, wheat, etc.

3. Fruits and seeds are developed from the pistil and ovary, so stamens are of no significance to fruits and seeds. ( )

Analysis: Only after the ovules are fertilized can fruits and seeds begin to grow.

4. Potatoes and carrots are both fruits of plants ( )

Analysis: Carrots are the roots of plants and cannot reproduce new life.

Flowers, fruits and seeds PPT, Part 5: Class summary

Flowers, fruits and seeds

Fruits and seeds are formed after plant flowering, pollination, and fertilization.

The stamens and pistils have special structures that allow the ovules to be fertilized and grow into fruits and seeds.

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For more information about the "New Life Flower Fruits and Seeds" PPT courseware, please click the New Life ppt Flowers, Fruits and Seeds ppt tag.

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Update Time: 2024-11-02

This template belongs to science courseware Fourth Grade Science Volume 2, Textbook Edition industry PPT template

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