1. Silkworm life is divided into the following four stages:,,,.
2, the newly hatched silkworm is called, in the process of silkworm growth, it has to go through two molts. The reason why silkworms shed their skin is.
3. The body of the silkworm moth is divided into several parts, with a right foot and a shape antenna.
It is said that the first country in the world to grow mulberry and raise silkworms to produce silk products taught people to raise silkworms and spin silks five thousand years ago.
The silk length of a cocoon is 100 meter, and a silkworm moth usually lays more eggs.
6. Silkworms breathe or breathe.
7. Before molting, the ant silkworm spins silk to fix its feet on the floor, and its head and chest are raised high and no longer move. After the old skin recedes and the new skin grows, the silkworm baby enters the next floor.
8. Before 2000, Zhang Qian in the Western Han Dynasty opened the trade channel between China and western countries, which made the material and cultural exchange between China and the West a reality.
9. The best time to spin silk is the day after cocoon formation. At this time, the pupae in the cocoon are mature and will not bleed, and there are still two or three days before emergence.
Second, judge.
1. In the process of sericulture, we found that the pupae after cocoon cutting could not develop normally. ()
2. Cocoon is made up of many silks. ()
3, silkworm eggs are oval, light gray, and some are concave in the middle. ()
4. Butterflies, cicadas and silkworms undergo three transformations in their life. ()
3. Short answer: When did the silkworm baby start spinning silk?
Fourth, drawing: write several processes of butterfly's life in the blank. (See page 70 of the textbook for the original picture)
My ability to study science
First, write about what the ant silkworm looks like in combination with the sericulture situation.
Second, draw the life changes of silkworms. (See the picture on page 24 of the textbook)
→
Shake the cocoon and take a photo under the light to see what the silkworm looks like inside.
4. What are your interests in sericulture? (at least four)
I study scientific methods.
First, recall and observe the changes of silkworm babies during molting and spinning, and write two observation diaries.
Observation diary
Month and day
Observation diary
Month and day
Second, how to help newly hatched silkworms move?
3. Can you tell the sex of the silkworm moth? Please record the identification method in the table below.
gender
Characteristic male and female silkworm moths
The antenna is getting bigger and smaller.
The abdomen is small and straight, 8 companies and 7 companies.
Vibration of wings: the two wings are constantly vibrating, and the vibration of the two wings is less and slower.
Other body colors are dark and white, and there are sachets at the tail.
Fourth, in the sericulture activities, Xiao Liang thought, "Which silkworm grows better than the silkworm that eats mulberry leaves and lettuce leaves?" How do you think he studied it?
My scientific practice has made us experience the long-standing silk drawing process in China.
Su Jiaoban fourth grade (below) science final exam questions
Name: Class: Student ID:
Fill in the blanks. (20 points)
1, sand fox, _ _ _ _ _ _ and other creatures live in the desert.
2. Do you know the names of marine life such as _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _?
3. There are many kinds of soilless culture, such as _ _ _ _ _ _, sand culture, peat culture and so on.
4. Silkworms like to eat _ _ _ _ _.
5. The newly born silkworm eggs are _ _ _ _ _ _ _ _ _ _ _
6. After about a week, the silkworm eggs will hatch into small black larvae. Silkworm babies are small and black when they first hatch, and their heads and bodies are also black. They are covered in hair and look like little ants. We call them _ _ _ _ _ _ _.
7. _ _ _ _ _ _ is the hardest mineral.
Second, multiple choice questions. (2 1)
1, the following minerals are raw materials of talcum powder: ()
A diamond b timely c copper ore d talc
2, the following objects can be used as raw materials for diamonds ()
A crystal b fluorite c diamond d granite
3, promote the "podium" is ().
A rolling b swinging c translating d rotating
4. The following animals don't live on the grassland ()
A leopard b dolphin c giraffe d hare
5, which of the following creatures live in the desert ()
A zebra b camel c lion d golden monkey
6, the following belong to gravity ()
A blows the balloon, b hits the apple, c brakes suddenly, and d plays the violin.
7. The way of swinging is ()
A rolling b swinging c translating d rotating
Three. List the problems. (20 points)
1, list four kinds of marine animals you like.
A:
2. If you are asked to study silkworms, the three questions you like to study are:
A:
3. Name three minerals you know.
A:
Fourth, think and do. (9 points)
1, I'll give you some rock samples. How many ways do you observe them? (See who has more ways. )
Method 1:
Method 2:
Method 3:
2. Connection problems. (9 points)
Basalt sedimentary rock
Shale magmatic rock
Marble metamorphic rock
3. Select metal minerals and copy them to the horizontal line below. (8 points)
Copper ore fluorite timely graphite hematite gold ore granite pyrite
Metal minerals: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
5. How many stages has the silkworm experienced in its life (8 points)
_______—_______—_______—
_______
6. What skills do you think animals and plants living in the desert need (5 points)
A: