"We Saw the Roots First" Plant Growth Changes PPT Courseware 3

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"We Saw the Roots First" Plant Growth Changes PPT Courseware 3

The role of roots

Absorb water and minerals (nutrients) and stabilize plants

Why do plants need to grow roots first?

The roots of plants can absorb water and minerals from the soil to meet the needs of plant growth, and can also fix the plant in the soil.

experiment:

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 to prevent the water in the test tube from evaporating into the air, and mark the water surface.

4. After some time, I found that the amount of water in the test tube became less.

Thinking: Where did the water in the test tube go? What does this mean?

How do botanists name plant roots?

A long and thick root grows out from the bottom of the stem, with an obvious main root and some small lateral roots growing around it. We call such a root - tap root.

Like plantain, there are many roots growing under the stem, all of about the same thickness. There is no obvious main root, and each root is as thick as a beard. Such roots - fibrous roots.

Knowledge expansion two:

Metamorphosis of roots: In order for plants to adapt to their living environment, the roots of some plants will develop special functions that make them different from others. We call them "abnormal roots."

Common abnormal roots:

Storage root: It grows underground, has a large body, contains many nutrients, and has a storage function. Its main root part is often spherical, such as carrots and radishes. Lateral roots or adventitious roots are often enlarged and lumpy (such as sweet potatoes)

Supporting roots: grow from the base of the above-ground stem and grow underground. They have the function of supporting the plant body upright. (corn, sugarcane, bamboo)

Aerial roots: grow from above-ground stems or originate from the base of the stems and hang in the air to absorb and store water. (banyan tree)

Parasitic roots: attached to the above-ground stems or roots of other host plants, and have suckers that penetrate deep into the host to absorb nutrients. Such as (Cuscutus)

Aquatic roots: hanging down in water, slender, soft and often green on the inside (rhombus)

Do you know what the roots do?

It can absorb water and nutrients from the soil to meet the needs of plant growth;

It also anchors plants in the soil so they won't flop over or be blown over by the wind.

Knowledge expansion three:

What other functions do roots have?

①Roots have the function of fixing the plant body.

②Has the function of storing nutrients.

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

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"We Saw the Roots First" Plant Growth Changes PPT:

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"We Saw the Roots First" Plant Growth Changes PPT Courseware 2:

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Update Time: 2024-10-02

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