"Spread the seeds far away" New Life PPT download

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"Spread the seeds far away" New Life PPT download

Part One: New Knowledge Explanation

1. How rapeseed spreads its seeds

Group discussion, representative report:

1. What are the characteristics of the shell of rapeseed fruit?

2. How do rapeseed seeds spread to long distances?

1. Rapeseed fruit shell

Easy to crack, the fruit clip is very thin and brittle, round shape

2. How are rapeseed seeds spread?

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.

2. How other plants disperse their seeds

1. Wind propagation

Downy, light, winged

2. Animal transmission

(1) It has hooks or barbs and can easily get caught on the animal’s fur and be taken away

(2) Brightly colored, sweet and juicy

3.Water spread

Plants that grow in water and swamps, their seeds often dispersed by water

Spread the seeds far away PPT, part two: expansion and extension

We already know how rapeseed is dispersed, so what do you think is the most suitable time for the farmer to harvest rapeseed? Why?

Cash crops such as soybeans, rapeseed, and sesame must be harvested in time when mature, otherwise the seeds will be scattered in the fields and suffer losses.

Spread the seeds far away PPT, part 3: Consolidation practice

Do it, talk about it

1. Choice

1. The seeds of impatiens depend on ( ) seeds.

A. Animal spread B. Wind spread

C. Ejection propagation D. Water flow propagation

2. Plants that use animals to spread their seeds are ( ).

A. Dandelion B. Rapeseed C. Xanthium bark D. Lotus

2. Judgment

1. If the seeds of plants fall around each other after they are mature, they will compete with each other for water and nutrients, which will cause the species to degenerate. ( ).

2. Pollen can be spread by wind and bees. ( )

3. The fruit of wild grape is delicious, and people and animals like to eat its pulp, which is not conducive to the spread of its seeds. ( )

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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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