? Review point of unit 1 of UNESCO's new edition of the third grade science album of primary school
1, when we want to know more and know more, when you look at its purpose, our observation activities begin.
Second, the trees on campus.
2. The overall shape of the tree consists of crown, trunk and root system.
3. The organs of trees are generally divided into six parts, including roots, stems, leaves, flowers, fruits and seeds.
Rub out the bark pattern, press it on the trunk, press it repeatedly on a piece of paper with your fingers, and then rub it on the paper with crayons to smooth out the raised parts.
, trees and grass
The stem of Cinnamomum camphora is woody stems.
6. For example, dried green bristlegrass is the stem of a herb.
7. Trees are woody plants and herbs.
8. Woody plants: willow, poplar, pine, elm, peach and apple trees.
9. Medicinal materials: green bristlegrass, clover, dandelion, plantain, corn, wheat and sunflower seeds.
Fourthly, aquatic plants.
10, according to living environment, plants can be divided into terrestrial plants and aquatic plants.
1 1 Terrestrial plants: willow, poplar, pine, elm, peach, apple, green bristlegrass, clover, dandelion, plantain and corn.
12, aquatic plants water hyacinth, peanut, duckweed and lotus.
13, organs (roots), (stems) and (leaves) of aquatic plants. Their growth needs (water), (sunlight) and (air).
14, why does the water hyacinth float on the water? Because the spongy protruding part of the petiole of water hyacinth is full of air.
Fifth, the leaves of plants.
15, the leaves of trees are various, and the leaves of the same tree have the same basic characteristics.
16, blade structure:
17, usually composed of petioles, leaves and veins of plants.
18 on this day, the life of leaves, the buds of leaves become smaller, grow up slowly and get old. Many plant leaves grow out. From spring to autumn, when brown dies, the leaves of life are finished.
19 leafy plants also have a complete process of growth, senescence and death.
Sixth, what plants will happen?
On the 20th, in the spring season, many plants soon entered the growth period, sprouting, growing, flowering and bearing fruit.
2 1, which changes in all aspects of plants, mainly in germination, growth, flowering and fruiting.
22. The blade length and width method is used to compare the blade size.
Seven, the same characteristics of plants
23. The growth of terrestrial plants needs sunlight, soil, water, air and nutrition.
24. The growth of aquatic plants needs sunlight, water, air and nutrition.
All plants need sunshine, water, air and nutrition to grow.
On 26th, the typical growth stages of sunflower life cycle: seed germination, emergence, flowering and fruiting.
27-year-old life is the life cycle of plants, and every factory has a certain life span.
28, the same characteristics of plants:
Growth in a certain environment requires the growth and development of sunlight, water, air and nutrition, which can change the process of reproduction from birth to death.
Unit 2 UNESCO's new edition of the third-grade science bookstore
?
First, look for small animals.
1, the diversity of animals, the survival of animals depends on the environment, different animals grow in different environments.
Second, snails (1)
Snail's body is divided into three parts, head, abdomen and tail. Head, eyes, tentacles and mouth. Snails have two pairs of antennae, the front is short and the back has long tentacles.
3, gastropods crawling snails. Snail mucus gastropods can protect gastropods (gastropods often keep moist to avoid being injured when crawling)
? Snails can respond appropriately to external stimuli. (Antenna extended), the fuselage retracts into the shell.
Three snails (2)
5. Leaves and other foods that snails like to eat.
6. Snails excrete waste from the anus.
7, snail stomatal breathing.
Fourth, earthworms
Earthworms like to live in a dark and humid environment.
9. The earthworm's body consists of many (links), body (mouth), (partition) and (anus).
10, earthworms contract when their hands contact other bodies.
? 1 1 Earthworms are not suitable for water worms for a long time.
? 12, snails and earthworms have the same points: they must adapt to the environment (wet), the body (soft) (crawling), eating (food), excreting (excreting) and (offspring).
? Five ants
? 13, ants adapt to life (land).
? 14, ants like to eat sweets such as sugar and bread crumbs.
15, the ant's body is divided into three parts (head), (chest) and (abdomen), a pair of tentacles (head) and three pairs of legs (6 feet) in the chest.
16, the characteristics of ants: living in (land), body (head, chest, abdomen), hexapod (foot), moving (crawling), (gregarious), food (variety), (breeding offspring).
? 17, when ants are moving, pheromone secretion guides ants to follow the same route. If our hands are in the traveling team and interfere with the pheromone of ants, ants will lose their sense of direction and crawl left and right.
6. Goldfish
Basic characteristics (structure) and (life form) of fish adapting to aquatic environment.
19 goldfish is a common ornamental fish. Goldfish is a common domestic animal, and there are many varieties cultivated artificially.
No.20 goldfish is characterized by living in water, body surface (scales), swimming (fins), breathing (cheeks), eating (fish food) and (debris), and (offspring).
? 2 1, eating goldfish by mistake. Feeding goldfish will also swell them to death.
? 22. Goldfish can breathe. When water flows through the gills of goldfish, it can use oxygen in the water to breathe.
23. Will goldfish explode if they keep drinking water?
? A: No. Goldfish suck water and then excrete it through gills.
24. The similarities between ants and goldfish are: (life), will (exercise), need (food) to keep growing, will (waste), and (offspring).
Seven, the same characteristics of animals
On 25th, snails, earthworms, ants and goldfish moved:
On the 26th, snails, earthworms, ants and goldfish all encountered dangerous reactions: shrinking their shells, running away and running away.
? Snails, earthworms, ants and goldfish like to eat: lettuce leaves, candy and fish food.
On the 28th, the animal world exceeded 6.5438+0.5 million.
On the 29th, animals and plants are living things. They are inanimate objects.
30. * * * Animals have the same characteristics: living in a certain (environment), exercising, needing (food) to maintain economic growth, being wasted (excreted), being a stimulus (reaction) to the outside world, and meeting (offspring) for economic growth and development.
Unit 3 UNESCO's new edition of the third-grade science bookstore
? The materials around us
As shown in figure 1, objects are made of one or more materials, and there are many different kinds of materials around us.
2. Common materials around us (wood, paper, metal, plastic, glass, fiber, ceramics, rubber), etc.
3. Peripheral projects (materials).
4. Use appropriate words to describe wood: (There are yellow and white lines on the surface, which are not too heavy and can be cut, and sawdust can float on the water ...)
Second, what kind of material is hard?
In fig. 5, the material with higher hardness is on the left side of the material with lower hardness (scratch).
6. To judge whether it is more rigid than other materials, you can use the method of drawing.
7 feet, the hardness of wood, cardboard, nails and plastics in descending order: nails >; Wood plastic feet > jam
8. This kind of metal is a very important material and has many important uses.
In fig. 9, the characteristic metals are (hard), (metallic luster), (ductility), (easy heat transfer), (conductivity) and poor (absorption). [bubble chart]
10 aluminum cans can be recycled. What are the main characteristics of the metal used? A: Extensibility.
Third, it is more flexible.
As shown in figure 1 1, physical properties can be used to describe the ups and downs of materials in water, such as hardness, flexibility and water absorption.
12, flexible deformation force of the object, nature (fragile).
13 cam's attention, iron sheets and plastic strips are made of four materials: the toughness and curvature of the best plastic strips. 14, plastic properties: (flexibility), (insulation), (corrosion resistance), (heat transfer is not easy), (light weight), (reusable). [bubble chart]
15 Observe the service life of plastic products and analyze what kind of plastic is used.
16, restore the identification mark.
Fourth, absorb water.
17, as well as water permeability, which is related to the composition and structure of the absorbent material.
18, four materials, wood, paper, metal and plastic: paper has the strongest water absorption capacity, followed by wood, and plastic and metal are the weakest.
19, in the characteristic paper:
Five, the ups and downs of materials in water
20. Different materials are different (ups and downs) in water.
2 1, metal objects are more likely to sink into the water, while objects made of wood, plastic and other materials are more likely to float in the water.
On 22nd, firewood (light), (relatively rigid), (easy to process), (elastic), (floating on the water) and (bearing capacity).
Bricks and pottery and porcelain
23. The main purpose of bricks (jigsaw puzzle houses) and ceramics (making daily necessities).
24. Bricks (clay) are fired.
25, manufacturing ceramics (special clay), must also be triggered.
26. The production of bricks, pottery and porcelain consumes a lot of clay, coal and other fuels, which has an impact on the environment.
Classification of surrounding materials
27. The materials we use are some natural materials (wood), (earth), (cotton) and (cowhide). Some man-made materials, such as (metal), (plastic), (ceramic) and (rubber). Some materials can be recycled, processed and utilized, but others cannot.
28. We should (reasonably) use materials to reduce the damage of the fourth unit of water and air (environment).
First of all, water
As shown in figure 1, objects can be divided into three categories: (solid), (liquid) and (gas). The difference between them is that solids have a fixed shape, while liquids and gases don't.
2. Water is a liquid without (color), (smell), (taste), (transparency) and (flow).
Water is an important substance, which exists in (plants), (animals), (people) and (soil).
Water is the source of life. (Plants), (animals) and (humans) are all inseparable from water.
5. Water has three states: solid (ice), liquid (water) and gaseous (water vapor).
6. A lot of water is used. Both (industrial) production (agricultural) production and (human) life need water.
? People usually fall into one category, water, vinegar and milk are called liquids, and stones, wood and leaves fall into one category called solids. There is a single kind in the air, called gas.
Second, the comparison of water and edible oil
8. Compared with edible oil (color), water is different in (odor), (transparency), (viscosity), (droplet shape) and (weight). , but they are (current) and have no fixed (shape).
Third, who is fluent and fast?
9. Influence of liquid velocity (viscosity).
Fourth, the amount of water.
In figure 10, the liquid has a certain volume, and the volume of the liquid can be measured.
1 1, the measuring cylinder is a graduated glass measuring cylinder, which is specially used for (measuring how much liquid), that is, measuring the volume of liquid.
As shown in figure 12, the volume of liquid is usually milliliters and liters.
13. When measuring the volume of liquid with a measuring cylinder, you should pay attention to the following two points: (1) The measuring cylinder must be placed (stably). (2) Read the lowest point of the liquid in the measuring cylinder (meniscus) (horizontal), and then read the volume of the liquid in sight.
Fifth, the air around us.
14, there is a kind of air around us, which we can (perceive).
15. Compared with water, air is different.
16, air is a kind of gas that has no (color), no (smell), no (taste) and (transparent) meeting (flowing). 17, formation of wind (air) flow.
Space occupied by air
18, occupied. The size (volume) of the air space occupied can be changed.
19, air can be (compressed), compressed air (elastic).
7. Weight of air
In Figure 20, air has a certain (by weight) but very light weight.