"We Saw the Roots First" PPT download of plant growth changes

Description

"We Saw the Roots First" PPT download of plant growth changes

Part One: Importing New Knowledge

The seeds we planted have changed, let’s take a look first!

think:

1. Who grows first, roots, stems or leaves?

2. Is every seed the same?

3. In what direction do roots grow?

4. Does it have anything to do with the direction in which the seeds are placed?

We first saw the root PPT, the second part: new knowledge explanation

Report and exchange

Through observation, we found that seeds germinate first ________ and then ______; the roots of plants grow toward ______, and the root growth rate is ______.

Study the role of roots

When we water impatiens, where do we usually water them? Why is most of it poured onto the soil?

group work

Follow the steps below to study the role of plant roots.

1. Select a plant with roots and put it into a test tube with water.

2. Soak the roots of the plant in the water in the test tube.

3. Drop some vegetable oil on the water surface so that the water in the test tube will not

4. Evaporated into the air and marked on the water surface.

5. Observe the changes in the amount of water in the test tube.

Summary of gains

What are the functions of roots?

1. Roots have the function of fixing the plant body.

2. It has the function of absorbing and storing water and nutrients.

3. The roots of a few plants also have the function of reproduction.

We first saw the root PPT, the third part: fun expansion

banyan tree roots

The banyan tree has many roots, which are the "aerial roots" of the banyan tree. In layman's terms, so-called "aerial roots" are roots that are exposed to the air and facilitate plant respiration and photosynthesis. The roots growing under the soil are called "nutritional roots." The so-called nutritional roots are the roots that provide nutrients to the plant so that it can grow.

We first saw the root PPT, the fourth part: Consolidation and improvement

1. Judgment questions

1. The main root is obvious. Plants with main roots and lateral roots are tap root plants. ( )

2. The roots of plants only serve to fix the plants in the soil. ( )

3. If the seeds are placed upright and the roots are placed, they will grow upward. ( )

4. When a plant seed germinates, its roots and stems grow at the same time. ( )

1. Planting is a long-term research and observation activity, and you must do a good job in ( ), ( ), ( ), etc.

2. Through observation, we found that seeds germinate first ( ), then grow ( ) and ( ).

3. Plants ( ) always ( ) grow. The root growth rate is faster than ( ). Roots can ( ) and ( ), and can also plant ( ).

We first saw the root PPT, the fifth part: Classwork

Roots play an important role in absorbing water and minerals to meet the needs of plant growth. What kind of roots are there? How to name and classify them? Collect information and report in the next class.

Keywords: Free download of the third-grade Chinese PPT courseware for the second volume of the textbook version. We first saw the roots PPT download, the growth changes of plants PPT download, .PPT format;

For more information about the PPT courseware "The Growth Changes of Plants, We First See the Roots", please click the "The Growth Changes of Plants, We First See the Roots" ppt tag.

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Update Time: 2024-11-25

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

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