"Spread the seeds far away" new life PPT courseware

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"Spread the seeds far away" new life PPT courseware

After the fruit matures, what important things will grow inside?

seeds

After the fruit of the fruit pod plant matures, the dry and hard peel will burst automatically under the baking of the sun, or it will burst with a little external force.

Ejection propagation: rapeseed, impatiens, etc.

animal transmission

1. Some seeds have stinging hairs and barbs on the outside. As long as they are touched lightly, they will immediately adhere to people's clothes or animal hair and feathers. Such as cocklebur, ghost grass, etc.

2. Fruity plants such as cherries, wild grapes, and wild ginseng rely on birds or other animals to spread their seeds in all directions.

3. There are also some nut seeds, such as chestnuts and pine nuts, which are the favorite food of squirrels. They are moved home and stored by squirrels. Some of them will be eaten, and the rest will take root and sprout next year.

wind propagation

Seeds that are spread by wind are usually light enough to float in the air and move everywhere with the wind.

Wind dispersal: Grows wing- or feather-like appendages, or tiny seeds that ride on the wind.

waterborne

Plants that grow in water and swamps often spread their seeds by water.

Such as lotus and coconut.

Will lotus seeds and coconut seeds not rot in water?

The fruits of lotus seeds, coconuts and other plants spread by water flow will not rot and sink in water. Because their fruit skins are thick and contain rich, very light fiber, they can allow the fruits to float on the water and prevent the seeds from rotting or sinking due to soaking and water absorption.

think:

What does the way a plant disperses its seeds have to do with it?

Why are there so many ways to spread it?

The way plants disperse seeds is related to their growth environment and the characteristics of seeds and fruits (such as shape, structure). The dispersal of seeds and fruits must be adapted to their own characteristics and to the environment in which the plants grow.

Can apples, grapes, etc. be spread by wind? Can it be spread by ejection? Can it be spread by water? Why?

Since plants grow in various environments and have various characteristics of seeds and fruits, plants disperse their seeds in various ways, all in order to spread the seeds wider and facilitate the reproduction of future generations.

Spread of various plant seeds

After the seeds mature, they fall close to the plant instead of spreading far away. What will happen?

After the seeds are mature, what will happen if they fall near the plant?

If a plant's seeds all fall close to the plant, the chances of the seeds surviving will be reduced, or the number of surviving seeds will be very small. Because in this case, when the seeds germinate and grow, a large number of plants of the same species will be crowded together, which will lead to a shortage of plant nutrients, sunlight and other growth factors, affecting plant growth. The final result is that the whole family will die. So plants try to spread their seeds as far away as possible.

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"Spread the seeds far away" New Life PPT download:

"Spread the Seeds Far Away" New Life PPT Download Part One Content: New Knowledge Explanation 1. Group discussion on how rapeseed spreads its seeds. Representative report: 1. What are the characteristics of the rapeseed fruit shell? 2. How are the seeds of rapeseed spread to Far away? 1. Rape fruit..

"Spread the seeds far away" New Life PPT:

"Spreading Seeds Far Away" New Life PPT Part One: The way rapeseed spreads its seeds. Observe the mature rapeseed pods. What are the characteristics of its outer shell? What happens when you gently pinch ripe rapeseed pods with your hands? Collect the scattered rapeseed...

"Spread the seeds far away" New Life PPT Courseware 2:

"Spread the Seeds Far Away" New Life PPT Courseware 2 After the fruit of the fruit pod plant matures, the dry and hard peel will burst automatically under the baking of the sun, or it will burst with a little external force. Autotransmission (ejection transmission): spread by animals such as rapeseed, impatiens, etc..

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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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