"Seeds Become Seedlings" Plant Growth Changes PPT Courseware

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"Seeds Become Seedlings" Plant Growth Changes PPT Courseware

root growth direction

1. Seeds germinate first ( ), then ( ); the roots of plants grow toward ( ), and the root growth rate is ( ).

2. The relationship between the direction of root growth and the direction of seed placement ( ).

What is the color of the newly unearthed impatiens leaves?

This is the first pair of leaves of impatiens - cotyledons (that is, the cotyledons inside the seed)

The cotyledons are dark green, round, with a smooth surface and no obvious veins.

During the germination process of impatiens seeds, the role of cotyledons is to provide nutrients.

Think about it: Why are the leaves of plants flat, growing crosswise on the plant, and extending in all directions?

The leaves of impatiens are flat and cross-grown (alternative) in order to receive maximum sunlight and perform photosynthesis.

Now that we know the "photosynthesis" of plants, do we now know what are the most important conditions required for plant growth?

conditions for plant growth

1. Suitable temperature

2. Sufficient sunshine

3. Proper moisture

4. Circulating air

Sources of plant nutrients

1. The first pair of leaves that grow after the impatiens emerge from the soil are developed from the cotyledons. The nutrients needed for seed germination are also the nutrients stored in the cotyledons. Before the true leaves appear, the nutrients needed for the growth of the seedlings still mainly come from As for the cotyledons, the green stems and light green cotyledons can also perform weak photosynthesis.

2 The second pair and subsequent leaves develop from leaf buds and are called true leaves. After the true leaves grow, the nutrients the plant needs are mainly provided by the true leaves through photosynthesis.

Why do plants want more sunlight?

Why are most of the leaves and stems of plants green when they are young?

Plants rely on sunlight to produce nutrients

The reason why plants are green is because their leaves contain many tiny green particles - chlorophyll, which is an important type of green pigment in the chloroplasts of plant cells.

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"Seeds Become Seedlings" Plant Growth Changes PPT Download:

"Seeds Turn into Seedlings" Plant Growth Changes PPT Download Part One: Introduction of New Knowledge People need to grow up and need to supplement various nutrients. How do we obtain nutrients? 1. Where do the nutrients needed for plant growth and development come from? 2.They...

"Seeds become seedlings" Plant growth changes PPT:

"Seeds Become Seedlings" Plant Growth Changes PPT Part One: Changes in Seedlings after Unearthing From seeds to seedlings, we have recorded many facts about the growth changes of impatiens. Now let's share our observation records! In the three weeks before the exchange, Impatiens...

"Seeds Become Seedlings" Plant Growth Changes PPT Courseware 3:

"Seeds Become Seedlings" Plant Growth Changes PPT Courseware 3 1. Share our observation records 1. The time when the impatiens was unearthed is: 3.23 (sowing) 4.3 (seedlings emerge, the 13th day after sowing) April 12 ( One week after the first pair of true leaves emerge). April 1..

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Update Time: 2024-10-27

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

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