"Earthworm Looking for a Home" PPT

Description

"Earthworm Looking for a Home" PPT

Part 1: Importing new lessons

Riddles

It has pointy heads and an ugly appearance, and has no hands, feet, ears or eyes.

He works underground all day long and only comes out when it rains.

Answer: earthworms

Earthworms are a common terrestrial annelid that live in the soil. They lie dormant during the day and emerge at night. They feed on livestock and poultry manure and organic waste and swallow it together with the soil. It also feeds on plant stems and leaves. Earthworms can loosen the soil, improve the soil, improve fertility, and promote agricultural production.

Earthworm Finds a Home PPT, Part 2: New Lesson Learning

Experiment 1: Earthworms’ response to light and dark environments

Find a rectangular paper box, paint the inside black, and dig out half of the bottom of the box. Please put a piece of film or a piece of blow molding paper on the bottom of the flat box on the table, then put a piece of damp black cloth on it, and put the earthworms you caught. In the middle of the bottom of the box, close the lid. After a while, observe which way the earthworms are likely to crawl.

Experiment 2: Earthworms’ response to wet and dry environments

Remove the lid of the box and the wet cloth spread on the bottom of the box. Place dry soil on the left side of the box and wet soil on the right side. Leave a distance (about 3 cm) between the dry and wet soil. Place the earthworms between the dry and wet soil. , observe which way the earthworm crawls.

Earthworms' response to light and dark environments

Experimental phenomenon: Earthworms crawl into the dark.

Experimental conclusion: Earthworms are suitable for living in a dark environment.

Earthworms' response to wet and dry environments

Experimental phenomenon: Earthworms crawl into wet soil.

Experimental conclusion: Earthworms are suitable for living in a humid environment.

Earthworm Finds a Home PPT, Part 3: Summary and Practice

Class summary

Earthworms are suitable for living in dark and humid environments. Different animals live in different natural environments, and different animals need to live in different environments. Animals and the environment are interdependent.

Class exercises

1. Earthworms are suitable for living in _________ and _________ environments.

2. Why do swallows, geese and other birds fly south to spend the winter? Didn't fly back until the following spring?

Earthworm Finds a Home PPT, Part 4: Homework Assignment

Go to nature to observe some small animals and see what kind of environment they live in.

Earthworms looking for a home

The living environment of earthworms: a dark and humid place

The relationship between animals and the environment: Different animals live in different environments, and animals and the environment are interdependent.

Keywords: Qingdao edition fourth grade science PPT courseware for the second volume free download, Earthworm Finds Home PPT download, .PPT format;

For more information about the PPT courseware "Earthworms Looking for a Home", please click on the "Earthworms Find a Home" ppt tag.

File Info

Update Time: 2024-11-21

This template belongs to science courseware Qingdao Edition Fourth Grade Science Volume 2 industry PPT template

Preview