"Silkworm Baby is Born" Let's Raise Silkworms PPT Courseware

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"Silkworm Baby is Born" Let's Raise Silkworms PPT Courseware

Mulberry harvesting and silkworm rearing in ancient China

According to research by experts, silkworm rearing in ancient China began more than 5,000 years ago. The mulberry industry in ancient my country was very developed, and sericulture has a long history, and a self-contained sericulture culture has already been formed. In all sericulture countries in the world, the original silkworm breeds and sericulture methods were directly or indirectly passed on from our country.

How to raise silkworms

1. Find an empty shoe box and put clean white paper on the bottom of the box.

2. Prepare silkworm eggs and put them in a pocket close to your body. Check every day to see if there are any new baby silkworms emerging. The baby silkworms usually emerge the most in the morning.

3. Place a few fresh mulberry leaves on the white paper, and carefully sweep the silkworms onto the mulberry leaves with a brush or clean feather.

4. Wash the mulberry leaves and dry them. Change the mulberry leaves to the silkworms on time in the morning, noon and evening, and clean up the silkworm feces.

5. Carefully observe and record the growth changes of silkworm babies.

Hatching of silkworm eggs

Silkworms that have just hatched from the eggs are brown or russet, small, and resemble ants, so they are named after them.

The body length of ant silkworms is about 2.5 mm, the body width is about 0.5 mm, and 2000 to 3000 ant silkworms weigh only 1 gram.

Synchronous detection

1. Fill in the blanks.

1. my country is the first country in the world to raise ( ) and reel and weave silk.

2. The silkworm’s home needs ( ), ( ).

3. When we observe silkworm eggs, we need to record ( ), ( ), ( ).

4. The newly hatched silkworms are ( ) color, have many ( ), and are about the same size as ( ).

2. Judgment questions.

1. The size of silkworm eggs we observed is much larger than rice grains. ( )

2. When we observe silkworm eggs, we should observe the size, shape, color, etc. of the silkworm eggs. ( )

3. The way to protect silkworm eggs and fresh mulberry leaves is to refrigerate them. ( )

4. Silkworms will hatch when the temperature and humidity are suitable. ( )

5. When the silkworm baby first hatches from the egg, it is black and small, like an ant, so we call it ant silkworm. ( )

6. Silkworms only eat mulberry leaves. Without mulberry leaves, silkworms cannot be raised. ( )

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"Silkworm Baby is Born" Let's Raise Silkworms PPT Courseware 4:

"Silkworm Baby is Born" Let's Raise Silkworms PPT Courseware 4 Let's take a look. We have raised snails. How do snails grow and change throughout their lives? How long do they live? Do you still want to know the growth changes of other animals throughout their lives and their lifespans? So let’s study this lesson...

"Silkworm Baby is Born" Let's Raise Silkworms PPT Courseware 3:

"Silkworm Baby is Born" Let's Raise Silkworms PPT Courseware 3 Observe the silkworm eggs. The newly born silkworm eggs are light yellow. They look flat and a bit oval with a magnifying glass. Use a ruler to measure them. They are about 1.2 to 1.3 mm long. If kept at room temperature, it will gradually turn purple-black. ..

"Silkworm Baby is Born" Let's Raise Silkworms PPT Courseware 2:

"The Silkworm Baby is Born" Let's Raise Silkworms PPT Courseware 2 Understand the History of Silkworm Raising in my country Our country is the first country in the world to raise silkworms and reel [sāo] silk for weaving. Silk has a history of about 5,000 years. Observe silkworm eggs. Newly hatched silkworm eggs are light yellow. Use a magnifying glass to...

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Update Time: 2024-11-03

This template belongs to science courseware Hunan Education Edition Third Grade Science Volume 2 industry PPT template

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