"Flowers, Fruits and Seeds" New Life PPT Courseware 2

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"Flowers, Fruits and Seeds" New Life PPT Courseware 2

We have observed rapeseed flowers and learned about various flowers in nature. We know that many flowers bloom and bear fruit.

Flowers of plants are responsible for producing seeds and propagating new life. How are plant fruits and seeds formed?

Exchange and discussion

What do you find when you compare the stamens of different flowers?

(There are filaments and anthers, and there is pollen in the anthers, and the pollen is easy to shake off)

What do you find when you compare the pistils of different flowers?

(There is a stigma, an ovary, and there is mucus on the stigma)

Small experiment (artificial pollination)

1. Let the stigma touch the pollen on the paper lightly and observe whether the pollen is easily stained.

2. Use a cotton swab to gently touch the stamen anthers.

3. Use a cotton swab that has touched the anthers of the stamen to lightly apply it on the stigma of the pistil.

ovule fertilization

After the ovules are fertilized, the fruits and seeds begin to grow, and the flowers begin to wither.

Rapeseed buds, flowers, fruits and seeds

Carefully peel open a nearly ripe rapeseed fruit, observe the rapeseed seeds inside, and count how many seeds there are in a rapeseed pod.

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"Flowers, Fruits and Seeds" New Life PPT Download:

"Flowers, Fruits and Seeds" New Life PPT Download Part One: Introduction of 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...

"Flowers, Fruits and Seeds" New Life PPT:

"Flowers, Fruits and Seeds" New Life PPT Part One: Stamens and Pistils Put the stamens of several flowers together and observe what they have in common. Use a magnifying glass to look at the various parts of the stamen. Shake the pollen on the anthers onto the white paper and observe. ... ..

"Flowers, Fruits and Seeds" New Life PPT Courseware:

"Flowers, Fruits and Seeds" New Life PPT Courseware Scientific Concepts: 1. Fruits and seeds are formed after plants bloom, pollinate and fertilize. 2. Stamens and pistils play a very important role in the formation of fruits and seeds. Stamens and pistils have special structures that make...

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Update Time: 2024-11-18

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

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