"Earthworm" Animal PPT Courseware 3

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"Earthworm" Animal PPT Courseware 3

What is in the living environment of earthworms?

We live in the soil, stay up day and night, and often drill holes underground to loosen the soil so that water and fertilizer can easily enter, thereby improving soil fertility and improving soil, which is conducive to the growth of plants and promotes agricultural production. There are about 2,500 species of us in the world, and 229 species have been recorded in China.

Earthworms live in a dark, humid environment rich in organic matter. The optimal temperature is 15℃-25℃. The soil moisture content generally survives in an environment with a soil moisture content of more than 60%.

1. Observe the morphological structure of earthworms

2. Think about what earthworms eat?

Today I met an ant on the way to forage. He took a big piece of biscuit, which looked delicious! My mouth is watering!

earthworm food

It feeds on animal and plant debris in the soil, decaying organic matter, and swallows the soil together. It also eats plant stems and leaves and other debris.

Life habits of earthworms:

Earthworms are a common terrestrial annelid. They burrow in the soil during the day and crawl to the ground at night to feed on organic matter in the soil or plant stems and leaves.

3. Think about whether earthworms have “legs”?

discuss:

1. What kind of environment are earthworms suitable for living in? What are its living habits (including feeding habits)?

Earthworms are suitable for growing at a certain temperature and humidity, with little temperature difference.

Live in burrows in humus-rich soil. They usually lie down during the day and come out at night.

Feeds on organic matter such as dead branches and leaves in the soil.

2. Why should the body surface of earthworms be kept moist during the experiment? Why do earthworms crawl to the ground after heavy rain?

Earthworms have no respiratory system and rely on their moist body walls that secrete mucus to breathe.

After a heavy rain, too much rain will push the air out of the soil.

So the earthworms that burrowed in the soil were forced to crawl to the surface to breathe.

Characteristics of earthworms adapting to life on land

Living environment: moist soil rich in humus.

Life habits: They stay up during the day and emerge at night, feeding on dead leaves, roots and other organic matter of plants.

Morphological structure and function:

1. Body segmentation.

2. There are bristles on the body surface.

3. There is mucus on the body surface, and there are no specialized respiratory organs - dissolved oxygen in the air for breathing.

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Update Time: 2024-09-30

This template belongs to science courseware Third Grade Science Volume 1, Textbook Edition industry PPT template

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