"Earthworm" animal PPT

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"Earthworm" animal PPT

Part One: Observing the Body of Earthworms

Gently pick up the earthworm from the breeding box with your fingers, place it on a white paper, observe the earthworm with a magnifying glass, and draw its appearance.

The body of an earthworm is round and long, composed of many similar body segments. The slightly pointed front section is the head, the slightly rounded rear end is the tail, and there is an annulus with inconspicuous segments at the front end. The girdle part is the reproductive organ of the earthworm.

How do earthworms crawl?

Earthworms have a ring of setae on their body segments. Earthworms rely on the contraction and relaxation of muscles to provide power for movement, and coordinate with the setae to complete the movement.

Gently touch the earthworm's body with a pen and observe its reaction.

Quickly tighten your body and swing from side to side.

The front end of the earthworm has a brain, and the brain extends backward into the ventral nerve cord. Therefore, earthworms respond more sensitively and accurately to stimulation.

Earthworm PPT, Part 2: Observing the reaction of earthworms

Fill a shallow dish with a small amount of room temperature water.

Gently place the earthworm into the water and observe its reaction.

After observation, put the earthworms into the breeding box.

Put earthworms into the water and they will crawl towards the edge of the plate trying to get out of the water.

The best environment for earthworms to live is humid, but earthworms cannot live in water.

In summer, after a heavy rain, earthworms will crawl out of the ground to breathe.

Earthworm PPT, part 3: Comparing snails and earthworms

Compare the similarities and differences between snails and earthworms.

snails

Living in wet places on the ground

Has shell, tentacles, eyes

Crawling on belly legs

Eat vegetables and other foods

earthworm

live underground

The body has links

telescopic advance

Eat fallen leaves and other foods

Adapt to humid environment

The body is soft and can crawl

Respond to external stimuli

Eat food and excrete it

will reproduce

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For more information about the "Animals and Earthworms" PPT courseware, please click on the "Animals ppt Earthworms ppt" tag.

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Update Time: 2024-10-13

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

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