Review materials of natural science and education edition of grade three in Shanghai primary school.

Review points of the first volume of science in the third grade of primary school in the new education edition

The review points of the first unit of the third grade science of the People's Education Press.

1, when we want to know more, know more and go to see it with such a purpose, our observation activities begin.

Second, the trees on campus.

2. The overall shape of a tree is generally composed of crown, trunk and root.

3. The organs of trees generally include roots, stems, leaves, flowers, fruits and seeds.

4. Method of wiping the bark pattern: Press the white paper tightly on the trunk, press it repeatedly with your fingers, and then wipe it flat on the paper with crayons to dye the raised parts.

Third, big trees and grass.

5. The stem like camphor tree stem is called woody stem.

6. Stems like Setaria viridis are called grass stems.

7. Trees are woody plants and grasses are herbaceous plants.

Woody plants include willow, poplar, pine, elm, peach and apple trees.

9. Herbs include: green bristlegrass, clover, dandelion, plantain, corn, wheat and sunflower.

Fourthly, aquatic plants.

10. According to different living environments, plants can be divided into terrestrial plants and aquatic plants.

1 1. Terrestrial plants include willow, poplar, pine, elm, peach, apple, green bristlegrass, clover, dandelion, plantain and corn.

12. Aquatic plants are: water hyacinth, Ceratophyllum, Alternanthera philoxeroides, duckweed and lotus.

13. Aquatic plants have (roots), (stems), (leaves) and other organs. Their growth needs (water), (sunlight) and (air).

14. Why can water hyacinth float on the water? Because the sponge in the swollen part of the petiole of water hyacinth is full of air.

Verb (abbreviation for verb) leaves of plants

15, the leaves of trees are various, and the leaves of the same tree have the same basic characteristics.

16, leaf structure:

17, the leaves of plants are generally composed of petioles and leaves with veins on them.

18, the leaves are also alive. They grow from leaf buds to small tender leaves, and then grow up and get old. The leaves of many plants grow from spring to yellow and die in autumn, completing the life of leaves.

19, the leaves of plants also have a complete process of growth, aging and death.

6. What happened to the plants?

20. In spring, many plants quickly enter the growing period, sprouting, growing, flowering and bearing fruit.

2 1, the changes of plants are manifested in various aspects, mainly in germination, growth, flowering and fruiting.

22. Compare the size of the blade with the length and width of the blade.

What are the same characteristics of plants?

23. Growth requirements of terrestrial plants: sunlight, water, air, nutrition and soil.

24. Growth requirements of aquatic plants: sunlight, moisture, air and nutrition.

All plants need sunshine, water, air and nutrition.

26. The typical growth stages of sunflower are: seed, germination, seedling, flowering and fruiting.

27. A plant has a life cycle, and each plant has a certain life span.

28, the same characteristics of plants:

Growing up in a certain environment requires sunshine, water, air and nutrition, all of which can grow and develop, all of which can reproduce, and all of which have a process from birth to death.

Review points of unit 2 of the first volume of science in the third grade of primary school published by People's Education Press

First, visit small animals.

1. Animals are diverse, and their survival depends on the environment. Different animals live in different environments.

Second, the snail (a)

The snail's body is divided into three parts: head, abdomen and tail. The head has eyes, tentacles and mouth. Snails have two pairs of antennae, the front is short, the back is long, and the top of the long antennae has eyes.

3. Snails crawl on their bellies. The mucus in the snail's abdomen can protect the abdomen (the abdomen is often kept moist to avoid being damaged when crawling)

Snails can respond to external stimuli. Such as (antenna extension) and (fuselage contraction) in the housing.

3. Snails (2)

Snails like to eat vegetables and leaves.

6. Snails excrete waste through the anus.

7. Snails use pores to breathe.

Fourth, earthworms

Earthworms like to live in dark and humid environment.

9. The earthworm's body is composed of many parts, including (mouth), (belt) and (anus).

10. Earthworms shrink when we touch them with our hands.

1 1. Earthworms can't adapt to the environment in water and can't be put into water for a long time.

12. Snails and earthworms have the same characteristics: both adapt to (wet) environment, have soft bodies, are cosmopolitan (crawling), can eat (food), excrete, reproduce, and so on.

Five, ants

13, ants adapt to land life.

14, ants like sweets such as sugar and bread crumbs.

15. The ant's body is divided into three parts: (head), (chest) and (abdomen). There are a pair of tentacles in the head and three pairs of feet (six feet) in the chest.

16. Ants are characterized by living on land, having three parts (head, chest and abdomen) and six feet, moving (crawling), living in groups, eating (diversity) and meeting (breeding offspring).

17, ants in the process of marching, will secrete a "pheromone", this "pheromone" will guide the ants behind to take the same route. If we pass through the procession of ants with our hands and interfere with the "pheromones" of ants, ants will lose their sense of direction and crawl around.

Six, goldfish

18. Fish has the basic characteristics of life and can adapt to the aquatic environment.

Goldfish is a common ornamental fish. Goldfish are cultured artificially, with many varieties, and are common domestic animals.

20. Goldfish is characterized by living in (water), having (scales) on its body surface, swimming with (fins), breathing with (gills), eating (fish food) and (breadcrumbs) and being able to (reproduce).

2 1, goldfish eat by swallowing. Feeding goldfish too much at a time will swell them to death.

22. When the goldfish breathes, the water flows through the gills of the goldfish, and the gills can use the oxygen in the water to breathe.

23. Will goldfish burst if they keep drinking water?

A: No. Because goldfish suck water into their mouths and then discharge it through their gills.

24. The similarities between ants and goldfish are: both have (life), will (exercise), need (food) to maintain growth, will (excrete) waste and will (reproduce).

What are the same characteristics of animals?

25, snails, earthworms, ants, goldfish movement:

26. Snails, earthworms, ants and goldfish react when they are in danger: shrink into the shell, shrink, escape, escape.

Snails, earthworms, ants and goldfish like to eat vegetables, leaves, sweets and fish food.

There are about1500,000 kinds of animals in the world.

29. Animals and plants belong to living things. They are all living things.

Animals have the same characteristics: they live in a certain environment, can exercise, need food to maintain growth, can excrete waste, can respond to external stimuli, can grow and reproduce.

Review points of unit 3 of the first volume of science in the third grade of primary school published by People's Education Press

First of all, the materials around us

1. Everything is made of one or more materials, and there are many different kinds of materials around us.

2. Common materials around us are (wood, paper, metal, plastic, glass, fiber, ceramics, rubber) and so on.

3. Know what things around you are made of.

4. Describe the wood with proper words: (yellow and white, with lines on the surface, not too heavy, capable of cutting, sawdust after sawing, capable of floating on the water ...)

Second, what kind of material is hard?

5. Materials with higher hardness will leave (scratches) on materials with lower hardness.

6. The method of (characterization) can be used to judge whether one material is harder than another.

7. Arrange the battens, cardboard, nails and plastic ruler in order of hardness: nails >; Wooden strips > plastic ruler > cardboard

8. Metal is a very important material and has many important uses.

9. Characteristics of metals: (hardness), (metallic luster), (ductility), (easy heat transfer), (conductivity), (poor water absorption), etc. [bubble chart]

10, aluminum cans can be recycled. What characteristics of metals are mainly used? A: Extensibility.

Third, it is relatively tough.

1 1. Physical properties can be used to describe materials, such as hardness, elasticity, water absorption and fluctuation in water.

12. Flexibility refers to the property that an object is not easy to break after being deformed by force.

13. Among the four materials, the plastic strip has the best toughness and the greatest bending degree. 14. Characteristics of plastics: (flexibility), (insulation), (corrosion resistance), (heat transfer is not easy), (light weight), (reusable), etc. [bubble chart]

15, observing the plastic products in life, we can analyze the nature of the plastic they use.

16, know the sign of recycling.

4. Do they absorb water?

17, water absorption refers to the permeability of the material to water, which is related to the composition and structure of the material.

Of the 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, characteristics of paper:

Five, the ups and downs of materials in water

20. Different materials fluctuate differently in water.

2 1. Objects made of materials such as metal are easy to sink into water, while objects made of materials such as wood and plastic are easy to float in water.

22. Characteristics of wood: (light weight), (relatively hard), (easy to process), (elastic), (floating on water), (bearing capacity), etc.

Six, brick and pottery, porcelain

23. Bricks are mainly used for building houses, while ceramics are mainly used for making daily necessities.

Bricks are made of (clay).

25. Ceramics are made of a special kind of clay and must also be fired.

26. The production of tiles and ceramics consumes a lot of fuels such as clay and coal, which will have an impact on the environment.

Seven, classify the materials around you.

We use natural materials, such as (wood), (clay), (cotton) and (cowhide). Some are man-made materials, such as (metal), (plastic), (ceramic) and (rubber). Some materials can be recycled, while others can't.

We should (reasonably) use materials to reduce the damage to (the environment). Water and air.

I. Water

1. Objects can be divided into three categories: (solid), (liquid) and (gas). The difference between them is that solids have fixed shapes, while liquids and gases have no fixed shapes.

2. Water is a liquid with no (color), no (smell), no (taste), no (transparency) and no (flow).

Water is an important substance, which exists in (plants), (animals), (human body) 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. Water has many uses. Production (industry), production (agriculture) and life (human) all need water.

People usually classify water, vinegar and milk as a kind of liquid. Stone, wood and leaves belong to the same category, which is called reality. Air is another kind, called gas.

Second, the comparison of water and edible oil

8. Compared with edible oil, water is different in (color), (smell), (transparency), (viscosity), (droplet shape) and (weight), but they are all (flowing) and have no fixed (shape).

Third, who is fluent faster?

9. All liquids will flow, and the flow rate is affected by (viscosity).

Fourth, compare water quantity.

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 cylinder, which is specially used to measure the volume of liquid.

12, and the liquid volume is usually expressed in milliliters and liters.

13. When measuring the volume of liquid with a measuring cylinder, we should pay attention to the following two points: (1) The measuring cylinder must be placed (stable). (2) When reading, the line of sight should be kept (horizontal) with the lowest point (concave level) of the liquid in the measuring cylinder, and then read out the volume of the liquid.

5. The air around us

14, air is a kind of (substance) that exists around us and can be perceived by us.

Compared with water, air has many similarities and differences.

16. Air is a gas with no (color), no (smell), no (taste), no (transparency) and no (flow). 17, wind is formed by (air) flow.

6. Will air take up space?

18, empty (space). The space (volume) occupied by air can be changed.

19, air can be (compressed), and compressed air has (elasticity).

Does air have weight?

20. Air has a certain weight, but it is very light.