Does anyone teach the science review materials in the second volume of the fourth grade?

Unit 1 examination questions

fill (up) a vacancy

1, consisting of battery, wire, light bulb, etc. The circuit of current is called.

2. One end of the battery is a copper cover and the other end is a zinc shell. This happens when the two ends are connected by wires. At this time, the battery and wires will become hot instantly, not only the light bulb can't emit light, but also it will break down quickly. Observing the flashlight, we can see that the lighting of the flashlight is made up of.

3. A substance that can pass through a circuit like a copper wire is called a substance that cannot pass through a circuit like plastic.

4. When detecting the circuit fault, we can make a detection. Circuit failures usually occur in small lamp holders, batteries and other places.

5. The voltage of one battery is1.5v. When two batteries are connected in parallel, the voltage is.

Two batteries are connected in series.

6. There are generally two basic ways to connect circuits, and the lighting circuits in our home are generally connected by methods.

The electric light was invented by an American inventor.

8. There are two kinds of charges in nature, which are the sum; The same kind of charges are mutual, and so are different kinds of charges. Charge flow formation.

Second, the judgment (correct "√", wrong "×")

1. The power generated by the power plant and transmitted to all households through wires is 220 volts .. ()

The voltage below 2.36V is safe for human body. ( )

Don't take shelter from the rain under the big tree when you encounter a thunderstorm outdoors. ( )

4. Use the circuit detector to detect the conductivity of the object and repeat the detection. ( )

The plastic wrapped on the wire is only to prevent the wire from rusting. ( )

6. We can do experiments with wires and sockets directly at home or at school. ( )

7. Electricity is inexhaustible in nature, so there is no need to save electricity. ( )

8. This switch can be used to control the light bulb switch. ( )

Third, choose.

1, which is unsafe in the following practices is ().

A, protect the insulator b, don't touch the electrical appliances and switches with wet hands.

C, clean the switch D with a damp cloth, and cut off the power supply when moving the electrical appliance.

2, the following objects belong to the insulating object is ().

A, wet cloth b, iron wire c, dry stick d, human body

3. The electricity for TV is (), and the electricity for flashlight is ().

A, alternating current b, direct current

4, enough to cause an electric shock accident, causing death of electricity is ().

a、 1.5V B、36V C、220V

5, the use of circuit detector to detect the conductivity of the object to ().

A, 1 time b, 2 times c,1time 0.

4. Connection (Where does the electricity used by the following appliances come from? Connect them with a thread. )

Electric light miniature radio

Refrigerator battery microwave oven

Small alarm clock TV

Electric torch for induction cooker power station

Calculator washing machine

Fifth, draw the light bulb structure diagram.

Second unit

First, the rape blossoms.

1. A complete rape lesson consists of six parts.

2. Rape flower consists of four parts.

Second, all kinds of flowers

1, the flowers of most plants are composed of four parts. Four well-equipped flowers are called; For example. Some flowers lacking one or more of them are called; For example.

2, only the stamens without pistils are called flowers; A flower with only pistils and no stamens is called a pistil flower. They all are. A flower with both stamens and pistils is called a pistil flower.

Three. Flowers, fruits and seeds

1. Plants are responsible for producing seeds and new life.

2. Stamens are made of pollen, which is hidden in flowerpots.

3. The pistil is made of and sticky, and the ovule is hidden in a bowl.

4. The process of pollen falling on pistil is called pollination. The main ways of pollination are artificial pollination and artificial pollination.

5. After pollination, pollen germinates on the pistil stigma, grows pollen tubes and extends down to the ovary. After the pollen tube and ovule are combined, the flowers begin to wither and gradually expand to form fruits and seeds.

6. The main process of plant reproduction of new life: the stamens of flowers produce pollen, which spreads to the pistil to fertilize the ovule, and then forms fruits and seeds.

7. Practice

I. fruit formation is irrelevant.

Petal b, ovary c, stamen d, pistil

II. Stamens are not included.

A, anther b, filament c, pollen d, stigma

III. Plants undertake the task of producing seeds and reproducing new life.

A, root b, stem c, leaf d, flower

Ⅳ. Draw the names of stamens and pistils of flowers.

Fourth, spread the seeds far away.

1. The fruits and seeds of different plants are different in morphology, and they have their own ways to spread their seeds to distant places.

2. The structure of fruits and seeds is adapted to the way of seed transmission.

3. Plants spread seeds far away, which is beneficial to the continuation of life.

4. Connect the planting methods of plants with lines.

Dandelions catapult willows.

Impatiens fragrans

Sowing peas with xanthium seed water

Cherry Peach Animals Spread to Ma Zhi

Verb (abbreviation for verb) seed germination

1,,, is a necessary condition for seed germination.

2. The structure of broad bean seeds can be divided into,, etc. After the embryo develops and grows, it becomes the sum of plants; The radicle grows and becomes a plant; What protects seeds is that what provides nutrition for seed germination is.

3. Seeds fall into the soil in warm spring, because.

Six, animal eggs and animal reproduction activities

1, animals are similar to plants in reproduction: animals are in harmony, and eggs can develop into a new generation of life after fertilization.

2. Animal breeding methods are basically divided into (such as Anima) and (such as reptiles, birds and reptiles).

3, need to be divided into many animals and; It can be produced in male animals or female animals, and combined with it, it can develop into a new generation of life.

4. Connect whether the following animals are oviparous or viviparous.

Snake turtle

Piglet viviparous bird

Fish dragonfly

Frog cat

Dog born toad

Orangutan sparrow

5. Please draw the names and functions of different parts of broad bean seeds.

Unit 2 examination questions

fill (up) a vacancy

1, a complete rape is composed of stems, flowers, fruits, seeds and other parts.

2. The flowers of most plants are composed of petals, stamens and four parts. A flower with four parts is called, a flower without one or several parts is called, and a flower with only pistil and no stamens is called.

; They all are. A flower with pistils and stamens.

3. Stamens are composed of pollen, which is hidden in flowerpots; The pistil is composed of style and stickiness, and the ovule is hidden in a bowl.

4. The process of pollen falling on pistil is called pollination. Pollination methods are mainly wind and labor.

5. Structural molecular leaves, seed coat and other parts of broad bean seeds. Embryos are formed after development and growth; The radicle is formed after development and growth; What protects seeds is that what provides nutrition for seed germination is.

6, many animals are divided into sexual animals and asexual animals, sexual animals can produce sperm and

Eggs produced by sexual animals can be combined to develop into a new generation of life.

7. Animal feeding is harmonious.

Second, choose

1. Fruit formation has nothing to do with this.

Petal b, ovary c, stamen d, pistil

2. Stamens are not included.

A, anther b, filament c, pollen d, stigma

3. The cotyledon of broad bean is the radicle.

A, growing into stems and leaves of plants; B, grow into the roots of plants.

Provide nutrition, protect

4. The yolk of an egg can be:

A. Grow into a chicken B. Provide nutrition C. Provide water

Plants undertake the task of producing seeds and reproducing new life.

A, root b, stem c, leaf d, flower

Three. Judgment (tick "√" correctly and "×" wrongly)

1. Seeds can germinate where there is water. ( )

2. Embryo is an important part of plant growth, but cotyledons have no function. ( )

3. The jumping and rolling distance of chestnut is closely related to its shape. ( )

All animals should change from eggs to adults. ( )

The ostrich's egg is bigger than the goose's. ( )

Fourth, connection (connecting plants with lines).

Impatiens balsamina water flow diffusion spray melon

Dandelion catapults spread maple trees.

Cang Li Erfeng pu ying Tao

Lotus plants spread xanthium seeds.

Verb (abbreviation of verb) short answer

1. Briefly describe the relationship among flowers, fruits and seeds.

2. Briefly explain the structure of eggs and the functions of each part.

Unit 3 examination questions

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1, we can classify the food we eat every day according to and more scientifically.

2. Food is rich in nutrients, mainly including:,,, etc.

3. It is the main component of human muscles, skin, internal organs, hair, nails and blood.

4. Among the nutrients needed by the human body, it is the main raw material and energy of the human body, which can promote health and enhance the body's resistance.

5, mold is a kind of. The deterioration of food is caused by. The growth and reproduction of microorganisms need certain conditions, such as, and so on.

6. There are many ways to store food, such as:,, and so on.

7. We can get the information of food name, ingredients, nutritional ingredients, storage requirements, manufacturers and so on from the food packaging bag.

8. You can know whether there is more iodine in food by dropping iodine.

Second, judgment (correct' tick' and wrong' x')

1, I only eat my favorite food in order to get dietary nutrition for myself. ( )

2. The correct way to smell the smell of unknown objects is to gently fan the bottle mouth with your hands, so that only a small amount of smell floats into your nostrils. ( )

Midterm exam questions

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1. The electricity generated by the power plant is transmitted to every household through wires, which is V electricity. High-voltage electricity above V can shock people within a certain distance, resulting in electrocution death. The voltage of dry battery is generally V, and the voltage of dry battery is V. One end of dry battery is marked with ""as the pole, and the other end is marked with ""as the pole. If the positive and negative poles of the battery are directly connected, it will cause.

2. The current loop consisting of battery, wire, light bulb and switch is called. The fault of the circuit may be in,,,,.

3. Rape flower consists of four parts. Stamens are composed of and, and pollen is hidden in nests; The pistil is composed of viscosity and the ovule is hidden in a bowl. The process of pollen falling on pistil is called pollination. The main ways of pollination are.

4,,,, is a necessary condition for seed germination. The structure of broad bean seeds is divided into,, and so on.

5. Animal feeding methods are basically divided into and; Among them, eggs can be produced in the body, sperm can be produced in the body, and sperm and eggs combine to form a new generation of life.

Second, judgment.

1, we can divide electricity into direct current and alternating current. ( )

When it rains, we can run under the big tree to take shelter from the rain. ( )

We can do experiments directly at home and school with the electricity from wires and sockets. ( )

Human body, earth and impure water are conductors. ( )

5. Connect the small lamp holder of the battery box with wires to make the small bulb glow. ( )

6. Iron sheet, copper wire and plastic are easy to conduct electricity; Dry wood does not conduct electricity easily. ( )

7. Where there is water, seeds will germinate. ( )

8. Embryo is an important part of plant growth, but cotyledons have no function. ( )

9. The distance of chestnut jumping and rolling is closely related to its shape. ( )

10. Chickens are hatched from egg yolk. ( )

Third, choose

1, nuclear power plant is to use electricity to drive the generator to rotate and send electricity to factories, villages and families through wires.

A, solar energy b, atomic energy c, tap water

2. The electricity used for washing machine is, and the electricity used for flashlight is.

A, alternating current b, direct current

3, dry wood is, wet wood is.

A, conductor b, insulator

The battery has an electrode. a， 1 b，2 c，3

Plants undertake the task of producing seeds and reproducing new life.

A, root b, stem c, leaf d, flower

Fourth, classification

1. Connect the following objects in the circuit respectively, which ones are easy to conduct electricity? Which ones are not easy to conduct electricity?

Cloth strips, pins, thin wooden strips, aluminum sheets, paper pieces, dirt, nails, wool, copper wires, rubber, human body and salt water.

Easy to conduct:

Non-conductive:

First unit

First, the electrostatic phenomenon in life

1. Electrostatic phenomena in life can be seen everywhere, and exist in all substances around us, including human beings.

2. There are two kinds of charges in nature: positive charge (represented by "+") and negative charge (represented by "-"). The same kind of charges are mutual, and so are different kinds of charges; The charge moves to form a current.

Edison lit the world's first electric lamp with electricity in 2008, and since then, electricity has illuminated our lives.

4, can make the charge transfer from one object to another, so that the object with static electricity.

5. The current path is formed by connecting,, and electrical components.

Step 6 give a short answer

(1), what conditions do you need to make charge flow to form current?

(2) Why don't we feel charged at ordinary times? Under what circumstances will an object be charged?

Light a small light bulb

1. All the electricity we use in our life is provided, for example.

2. The voltage of dry battery is that one end of dry battery is marked with "+"as the pole, and the other end is marked with "-"as the pole.

This is a portable power supply. One end of the battery is and the other end is. This happens when the two ends of the battery are directly connected by wires. At this time, the battery and wires will become hot in an instant, not only the light bulb can't shine, but also the battery will soon break down.

4. The electricity sent by the power plant to all households through wires is alternating current, which is enough to cause electric shock accidents and death, so we can't do experiments with the electricity in the socket at home or school.

Waste dry batteries will do harm to the environment, so don't throw them around after use.

6. Only when the current passes through the filament will the small bulb shine.

Second, the practice (judgment)

1. A plastic comb with dry hair will attract small pieces of paper. ( )

2. Static electricity only exists in non-living things. ( )

3. When the hair is dried with a comb, the comb is negatively charged and the hair is positively charged. When they get close, they will attract each other. ( )

The electrical appliances commonly used in our life can work normally with the help of power supply and circuit. ( )

Third, the circuit is simple.

1, the function of the switch is; The function of the battery clip is: the function of the small lamp holder is.

2. Circuit failures are generally due to failures in other places.

When checking the circuit fault, we can make one to detect it.

4. Short answer: How to use the circuit checker to detect faulty circuits?

IV. Conductors and insulators

1, an object that conducts electricity easily is called. For example, wait Objects that don't conduct electricity easily are called. For example, wait

2. short answer: talk about how to pay attention to the safe use of electricity in our daily life.

Five, different circuit connection

1, electric energy flows from one point to another, and between these two points is. Electricity cannot flow from one point to another, and between these two points is.

There are two ways to connect the circuit. Both batteries and light bulbs can be connected in series and in parallel.

Our light bulbs can only be turned on and off together, and our light bulbs can be turned on and off separately.

If the voltage of one battery is 0 and the voltage of two batteries in series is 0, then the small light bulb will.

5. Two batteries are connected in parallel, and the voltage is zero, so the light bulb is small.

Second unit

First, the rape blossoms.

1, a complete rape is composed of six parts.

2. Rape flower consists of four parts.

Second, all kinds of flowers

1, the flowers of most plants are composed of four parts. Four well-equipped flowers are called; For example. Some flowers lacking one or more of them are called; For example.

2, only the stamens without pistils are called flowers; A flower with only pistils and no stamens is called a pistil flower. They all are. A flower with both stamens and pistils is called a pistil flower.

Three. Flowers, fruits and seeds

1. Plants are responsible for producing seeds and new life.

2. Stamens are made of pollen, which is hidden in flowerpots.

3. The pistil is made of and sticky, and the ovule is hidden in a bowl.

4. The process of pollen falling on pistil is called pollination. The main ways of pollination are artificial pollination and artificial pollination.

5. After pollination, pollen germinates on the pistil stigma, grows pollen tubes and extends down to the ovary. After the pollen tube and ovule are combined, the flowers begin to wither and gradually expand to form fruits and seeds.

6. The main process of plant reproduction of new life: the stamens of flowers produce pollen, which spreads to the pistil to fertilize the ovule, and then forms fruits and seeds.

7、

8. Practice

I. fruit formation is irrelevant.

Petal b, ovary c, stamen d, pistil

II. Stamens are not included.

A, anther b, filament c, pollen d, stigma

III. Plants undertake the task of producing seeds and reproducing new life.

A, root b, stem c, leaf d, flower

Ⅳ. Draw the names of stamens and pistils of flowers.

Fourth, spread the seeds far away.

1. The fruits and seeds of different plants are different in morphology, and they have their own ways to spread their seeds to distant places.

2. The structure of fruits and seeds is adapted to the way of seed transmission.

3. Plants spread seeds far away, which is beneficial to the continuation of life.

4. Connect the planting methods of plants with lines.

Dandelions catapult willows.

Impatiens fragrans

Sowing peas with xanthium seed water

Cherry Peach Animals Spread to Ma Zhi

Verb (abbreviation for verb) seed germination

1,,, is a necessary condition for seed germination.

2. The structure of broad bean seeds can be divided into,, etc. After the embryo develops and grows, it becomes the sum of plants; The radicle grows and becomes a plant; What protects seeds is that what provides nutrition for seed germination is.

3. Seeds fall into the soil in warm spring, because.

Midterm exam questions

fill (up) a vacancy

1. The electricity generated by the power plant is transmitted to every household through wires, which is V electricity. High-voltage electricity above V can shock people within a certain distance, resulting in electrocution death. The voltage of dry battery is generally V, and the voltage of dry battery is V. One end of dry battery is marked with ""as the pole, and the other end is marked with ""as the pole. If the positive and negative poles of the battery are directly connected, it will cause.

2. The current loop consisting of battery, wire, light bulb and switch is called. The fault of the circuit may be in,,,,.

3. Rape flower consists of four parts. Stamens are composed of and, and pollen is hidden in nests; The pistil is composed of viscosity and the ovule is hidden in a bowl. The process of pollen falling on pistil is called pollination. The main ways of pollination are.

4,,,, is a necessary condition for seed germination. The structure of broad bean seeds is divided into,, and so on.

5. Animal feeding methods are basically divided into and; Among them, eggs can be produced in the body, sperm can be produced in the body, and sperm and eggs combine to form a new generation of life.

Second, judgment.

1, we can divide electricity into direct current and alternating current. ( )

When it rains, we can run under the big tree to take shelter from the rain. ( )

We can do experiments directly at home and school with the electricity from wires and sockets. ( )

Human body, earth and impure water are conductors. ( )

5. Connect the small lamp holder of the battery box with wires to make the small bulb glow. ( )

6. Iron sheet, copper wire and plastic are easy to conduct electricity; Dry wood does not conduct electricity easily. ( )

7. Where there is water, seeds will germinate. ( )

8. Embryo is an important part of plant growth, but cotyledons have no function. ( )

9. The distance of chestnut jumping and rolling is closely related to its shape. ( )

10. Chickens are hatched from egg yolk. ( )

Third, choose

1, nuclear power plant is to use electricity to drive the generator to rotate and send electricity to factories, villages and families through wires.

A, solar energy b, atomic energy c, tap water

2. The electricity used for washing machine is, and the electricity used for flashlight is.

A, alternating current b, direct current

3, dry wood is, wet wood is.

A, conductor b, insulator

The battery has an electrode. a， 1 b，2 c，3

Plants undertake the task of producing seeds and reproducing new life.

A, root b, stem c, leaf d, flower

Fourth, classification

1. Connect the following objects in the circuit respectively, which ones are easy to conduct electricity? Which ones are not easy to conduct electricity?

Cloth strips, pins, thin wooden strips, aluminum sheets, paper pieces, dirt, nails, wool, copper wires, rubber, human body and salt water.

Easy to conduct:

Non-conductive:

Unit 2 examination questions

fill (up) a vacancy

1, a complete rape is composed of stems, flowers, fruits, seeds and other parts.

2. The flowers of most plants are composed of petals, stamens and four parts. A flower with four parts is called, a flower without one or several parts is called, and a flower with only pistil and no stamens is called.

; They all are. A flower with pistils and stamens.

3. Stamens are composed of pollen, which is hidden in flowerpots; The pistil is composed of style and stickiness, and the ovule is hidden in a bowl.

4. The process of pollen falling on pistil is called pollination. Pollination methods are mainly wind and labor.

5. Structural molecular leaves, seed coat and other parts of broad bean seeds. Embryos are formed after development and growth; The radicle is formed after development and growth; What protects seeds is that what provides nutrition for seed germination is.

6, many animals are divided into sexual animals and asexual animals, sexual animals can produce sperm and

Eggs produced by sexual animals can be combined to develop into a new generation of life.

7. Animal feeding is harmonious.

Second, choose

1. Fruit formation has nothing to do with this.

Petal b, ovary c, stamen d, pistil

2. Stamens are not included.

A, anther b, filament c, pollen d, stigma

3. The cotyledon of broad bean is the radicle.

A, growing into stems and leaves of plants; B, grow into the roots of plants.

Provide nutrition, protect

4. The yolk of an egg can be:

A. Grow into a chicken B. Provide nutrition C. Provide water

Plants undertake the task of producing seeds and reproducing new life.

A, root b, stem c, leaf d, flower

Three. Judgment (tick "√" correctly and "×" wrongly)

1. Seeds can germinate where there is water. ( )

2. Embryo is an important part of plant growth, but cotyledons have no function. ( )

3. The jumping and rolling distance of chestnut is closely related to its shape. ( )

All animals should change from eggs to adults. ( )

The ostrich's egg is bigger than the goose's. ( )

Fourth, connection (connecting plants with lines).

Impatiens balsamina water flow diffusion spray melon

Dandelion catapults spread maple trees.

Cang Li Erfeng pu ying Tao

Lotus plants spread xanthium seeds.

Verb (abbreviation of verb) short answer

1. Briefly describe the relationship among flowers, fruits and seeds.

2. Briefly explain the structure of eggs and the functions of each part.