C bacterial constellation

Review the primary school science papers six times. .

First, multiple choice questions

1. It is better to observe the blade with a magnifying glass than with eyes (D).

A. leaf cells B. shape of leaves C. color of leaves D. thinner veins

2. If you look at an object with smooth eyes with a magnifying glass, you can see that it will become (C).

A.as smooth as before. B. Smooth as ever. C. as rough as before. D. vague as before.

3. What are the following characteristics of equipment that can magnify objects? (4)

(1) transparent (2) opaque (3) convex (4) concave.

A.( 1)(3)(5)b .(2)(4)c .( 1)(4)d .( 1)(3)

After observing all kinds of insects with a magnifying glass, we found that they all have (D)

(1) A pair of tentacles (2) Two pairs of flying wings (3) Three pairs of feet (4) Two rows of sharp teeth

A.( 1)(2)(3)b .( 1)(2)(4)c .( 1)(2)d .( 1)(3)

Aphids are harmful to plants, but they are also eaten by other insects. The common natural enemies of aphids are (C)

(1) Ladybug (2) Mosquito (3) Butterfly (4) Chrysopa

A.( 1)(2)b .(3)(4)c .( 1)(4)d .(4)

6. The maximum magnification of one convex lens is 5 times, and that of the other convex lens is 10 times. The maximum magnification of a simple microscope made of these two convex lenses should be (D).

A. 10 times B.1/kloc-0 times C. 15 times D.50 times.

7. Observing plant materials with a microscope, specimen making is an important link. In order to achieve better observation effect, the observed specimen should be (B)

A. complete B. thin and transparent C. colored D. thick

8. The most likely reason why the water in the fish tank turns green naturally is (b)

A.there is a kind of green algae in the water. B. the green algae in the water increased rapidly.

C. the water itself turns green. Green ink is added to the water.

9. Which of the following diseases are caused by germs? (3)

(1) Typhoid (2) Influenza (3) Cholera (4) SARS (5) Tuberculosis

A.( 1)(2)(5)b .( 1)(3)(4)c .( 1)(3)(5)d .(2)(4)(5)

10. Which of the following food production processes uses yeast? (1)

(1) milling (2) brewing (3) making vinegar.

A.( 1)(2)b .( 1)(3)c .(2)(3)d .( 1)(2)(3)

1 1. When the dough is fermented, the reason for the dough swelling is (c).

A. the flour becomes bigger. The yeast in the dough increased rapidly.

C. a large amount of carbon dioxide is produced in the dough. A lot of oxygen is produced in dough.

12. For food waste such as leftovers, leftovers, vegetable roots and leaves, the best treatment method is (c).

A. Recovery B. Landfill C. Compost D. Incineration

13. After the landfill is filled with garbage, we can build houses on it.

(1) Build a park (2) Build a house (3) Build a stadium (4) Build a parking lot.

A.( 1))(2)(3)b .( 1)(2)(4)c .( 1)(3)(4)d .(2)(3)(4)

14. Among the following behaviors, (d) can reduce the amount of garbage.

(1) Make full use of the blank space of paper, and don't discard single-sided paper. (2) Use wooden pencils less, and choose mechanical pencil.

(3) Bring your own lunch box, kettle, chopsticks, dental appliances, etc. (4) Carrying a cloth bag to go shopping.

(5) Try to buy items with simple packaging.

A.( 1)(2)(3)b .( 1)(2)(3)(4)c .(2)(3)(4)(5)d .( 1)(2)(3)(4)(5)

15. In the following behaviors, (b) is not desirable.

A. Drive out the completely unusable waste paper and send it to the recycling station.

B. Discard used plastic bags, tableware and light packaging boxes at will.

C sort the used glass, plastic, aluminum cans and other beverage bottles and send them to the recycling station.

D. organize a small publicity group to publicize the methods of reducing garbage.

16. Which of the following wastes can be used as base fertilizer after a period of accumulation? (2)

A. Broken bricks B. Leftovers C. Wine bottles D. Kraft paper packaging boxes

17. The most populous country in the world is (a)

A. China, the United States, Russia and India

18. The reason for the shortage of fresh water resources in the world may be (D)

(1) Rapid population growth (2) Serious water pollution (3) Global warming.

A.( 1)(2)b .( 1)(3)c .(2)(3)d .( 1)(2)(3)

19. The reason for the greenhouse effect is (b)

A. Oxygen tries to increase B. Carbon dioxide concentration increases C. Land fresh water decreases D. Sea water increases.

20. Will the destruction of the ozone layer in the earth's atmosphere lead to an increase in the incidence of human diseases? (1)

(1) respiratory diseases (2) skin cancer (3) cataract (4) heart disease.

A.( 1)(2)(3)b .( 1)(2)(4)c .( 1)(3)(4)d .(2)(3)(4)

2 1. Which of the following is the main cause of air pollution? (1)

(1) factory exhaust gas (2) automobile exhaust gas (3) garbage incineration (4) acid rain

A.( 1)(2)(3)b .( 1)(2)(4)c .( 1)(3)(4)d .(2)(3)(4)

22. The following is an environmental protection activity plan made by a class, of which (c) is not desirable.

A. Carry out waste recycling activities in the whole grade and send the collected waste to the purchasing station;

B design a publicity column on the community (village) publicity column to publicize the significance of waste reduction, reuse and recovery;

C. suspend classes for a week, pick up garbage in a nearby park, and publicize environmental protection knowledge to tourists;

D. submit local water pollution prevention and control measures to the local environmental protection department;

23. Man successfully landed on the moon in 1960s. The man who landed on the moon for the first time was (B)

A. Soviets, Americans, Chinese and Russians

24. The following statement about the moon is correct (C)

A.the moon can shine by itself

B. There are Moon Palace and Chang 'e on the moon, and some people have lived on them.

C. the moon, like the earth, can't shine by itself.

D There are rabbits, osmanthus trees and other plants on the moon, which are suitable for the life of most creatures on the earth.

25. Regarding the relationship between the moon and the earth, the following statement is true (A)

A. The moon is the satellite of the earth. It goes around the earth. B.the earth is a satellite of the moon, and the moon goes around the earth.

C the moon is the satellite of the earth, and the earth moves around it. D. the earth is a satellite of the moon, and the earth goes around the moon.

26. About the description of the moon phase change, the correct one is (c).

A. the moon phase changes because the shape of the moon is changing.

B. the phase change of the moon is caused by the irregular movement of the moon.

Due to the change of the relative positions of the sun, the earth and the moon, the phase of the moon is also changing.

D. if the moon shines by itself, there will be no phase change.

27. When a solar eclipse occurs, the following statement is correct (B)

A. people all over the world can see it. B.only some people in the world can see it.

C. If you see an annular eclipse in Haikou, you can also see D. None of the above statements are correct.

28. The following about the cause of the solar eclipse, the correct is (d).

A. A solar eclipse occurs because sunspots on the sun stop part of the sun from emitting light;

B. the solar eclipse happened because the earth blocked the sunlight.

C. the eclipse occurred because the sun blocked part of the moon's light.

D. The solar eclipse happened because the moon blocked the sunlight.

29. When an eclipse occurs, the following statement is true (A)

The sun, the earth and the moon are on the same straight line, and the earth is in the middle.

B The sun, the earth and the moon are on the same straight line, and the moon is in the middle.

The sun, the earth and the moon are on the same straight line, and the sun is in the middle.

D. the sun, the earth and the moon are not in a straight line.

30. As can be seen from the moon phase diagram, from the beginning of the lunar month to the end of the lunar month, the change of the moon phase is (a)

A. The moon area is from small to large. B. The moon area is from large to small.

C. the moon rises and sets with the sun. The moon rises earlier and earlier.

3 1. When we write a composition, we often write: "In the evening, a crescent moon hangs on the treetops ..." Among them, "new moon" should be (1).

A. the moon faces west. B.the moon faces the east. C.it is located in the eastern sky. D.it is located in the center of the sky.

Sometimes, at four or five o'clock in the morning, we will see the "waning moon" with incomplete moon phases. The moon at this time is (C)

A. the moon faces west. B.it's in the western sky. C.it is located in the eastern sky. D.it is located in the center of the sky.

August 15th is the Mid-Autumn Festival. At this time, we can see the "full moon" or "full moon" in the moon, which is (a).

A. The moon is round. You can see it all night. B.the moon is full, and you can only see the moon in the first half of the night.

C. the moon is perfect, and you can't see the moon until after midnight. D. None of the above statements are correct.

34. The light year is the unit of measurement (B)

A. the unit of celestial mass. A unit of distance between celestial bodies.

C. unit of light band. The unit of celestial body's running time.

35. The earth we live in belongs to (B)

A. Stars B. Planets C. Satellites D. Artificial objects

36. The nearest natural celestial body to the Earth is (C)

A.Altair B Sun C Moon D Mercury

37. The conditions for the existence of life on the earth are (b)

(1) Liquid water exists (2) The earth is the closest celestial body to the sun among the nine planets.

(3) It has a solid shell (4) and an atmosphere suitable for biological respiration.

(5) Planets go their own way and do not interfere with each other. (6) The earth is in constant motion.

A.( 1)(3)(4)(6)b .( 1)(4)(5)(6)c .(2)(4)(5)d .(3)(4)(6)

38. The correct statement about the nine planets in the solar system is (C)

A. Mercury is closest to the sun and has the smallest mass. B. The earth has the longest rotation, revolution and revolution time.

C.jupiter is the largest. D. king smart is always farthest from the sun.

39. What we usually call the Big Dipper is called (B) in astronomy.

A. Centauri B. Ursa major C. Lion D. Ursa minor

40. Among the following celestial bodies, the one that does not belong to the nine planets in the solar system is (A)

A. moon b Uranus c earth d Jupiter

Second, the judgment question

1. The crystal of each substance has a fixed shape, but the crystal shape of different substances is different. (√)

The crystal size of each substance is the same, and it is very small, so you must use a magnifying glass to see it clearly. (×)

3. Aphids harm plants in the same way that Chrysopa larvae eat aphids, and they all suck liquid. (√)

The invention of microscope is a great leap for human beings to know the world. Because we can magnify anything with a microscope. (×)

Today's electron microscope can magnify the observed objects infinitely. (×)

6. Put the crust and orange peel in a warm and humid place. After a few days, we may see many molds growing on it. (√)

7. Levin Hook was the first person to observe the tiny world with a microscope and the first person to discover and put forward "cells". (×)

8. Hands that look clean may also have bacteria. (√)

9. Bacteria and viruses make people sick. This shows that both bacteria and viruses are harmful. (×)

10. The main tumor in the root of leguminous plants is the symbiotic structure of root tissue (cell group) and rhizobia. (√)

1 1. When we visited a local water area, we found a large number of animals and plants living normally in the water area, so we can preliminarily infer that there can be no serious pollution in the water area. (√)

12. When studying a natural water area in my hometown, I found that the collected water samples had a thin layer of sediment at the bottom after standing for a period of time, indicating that the water in this water area contained more impurities. (√)

13. If you want to know whether there are microorganisms invisible to the naked eye in a certain water area in your hometown, just observe the water sample directly with a microscope. (×)

14. The moon only goes around the earth, not around the sun. (×)

15. An iron ball weighing 1 kg on the earth will still weigh 1 kg on the moon. (×)

16. Unlike the earth, there is no day and night on the moon. (×)

17. Without the protection of the atmosphere, the sunlight on the surface of the moon is much stronger than that on the earth, so the temperature on the surface of the moon is much higher than that on the surface of the earth at any time. (×)

18. The air on the moon is much thinner than that on the earth. (√)

19. From the current understanding of the moon, people have not found water on the moon. (√)

If we hold a football match on the moon, we will find that football can easily be kicked far away by us. (√)

2 1. Because the sun is closer to us than the moon, it looks like the moon is bigger. (×)

22. The moon is rich in mineral resources that human beings need. (√)

23. The moon is a very round sphere. (×)

Third, fill in the blanks

1. Expose the nutrient-rich culture medium to warm and humid air. A few days later, many bacterial colonies were found on the culture medium. This shows: (1) There are bacteria in the air; (2) When the external environmental conditions are suitable, bacteria can multiply rapidly and the number increases rapidly.

2. The various shapes of the moon during the change of the circle are called moon phases.

3. The reason for the formation of the solar eclipse is that when the moon runs between the sun and the earth, if the three are in a straight line, the moon will block the light from the sun to the earth, and people in the shadow on the earth can only see part or all of the sun, so an solar eclipse occurs; Similarly, the reason for the formation of an eclipse is that when the sun and the moon are just on both sides of the earth, the sunlight is blocked by the earth and cannot reach the moon, so the moon will have an eclipse through the shadow of the earth.

4. The types of solar eclipse are total solar eclipse, partial lunar eclipse and annular solar eclipse, and the types of lunar eclipse are total lunar eclipse and partial lunar eclipse.

5. The solar system is a celestial system with the sun as the center and composed of eight planets, asteroids, satellites, meteors and comets.

6. Among the eight planets in the solar system, if arranged in descending order, they are Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars and Mercury. If arranged from near to far from the sun, it is Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune, in which Venus is the nearest planet and Neptune is the farthest planet.

Fourth, the connection problem.

A, glass A, compost

B, broken bricks and tiles B, recycling

C, leftover meat at night C, recycling special safety treatment

D, old books, waste paper D, landfill

E. Waste batteries E. Incineration

Comprehensive evaluation method

First, multiple-choice questions. (3 points for each question, 30 points in total)

1. Ordinary magnifying glass is made of (b).

A. concave lens B. convex lens C. plane mirror D. prism

2. Ordinary optical microscopes generally have eyepieces and objective lenses. If you use a microscope with the words "1.5X" engraved on the eyepiece and 10 times the objective lens to observe insects, the insects will be magnified (c) times.

a . 15 b . 10 c . 150d . 1.5

3. The microscope magnifies tiny objects through the magnifying effect of (c).

A. two concave lenses B. a convex lens and a concave lens C. two convex lenses D. a convex lens

Every Mid-Autumn Festival, there are a large number of beautifully packaged moon cakes on the market. The following are some views on this phenomenon. What you think is worth advocating is (c).

A boxed moon cakes will create a lot of rubbish and pollute the environment, so we should not eat moon cakes during the Mid-Autumn Festival.

B: It's right to make the mooncake boxes exquisite, because it will improve the quality of mooncakes and increase our appetite.

C on the premise of not affecting the hygiene of moon cakes, the packaging box of moon cakes should be as simple as possible, and the packaging box should be recycled after eating moon cakes.

D. Whether the mooncake packaging box is exquisite is a matter for the merchants, so don't comment rashly.

5. Among the following garbage, the garbage that cannot be recycled is (D)

A. Old newspapers B. Plastic bottles C. Can D. Rotten vegetable leaves

6. In the following daily life behaviors, (c) is worth promoting.

A. Use your vacation time to clean the road with your classmates, and then collect and burn the garbage.

B. For the sake of hygiene, try to use disposable chopsticks when eating out.

C. when you go to the vegetable market to buy food, you always take the basket with you.

D. throw the used batteries into the trash can in the living area.

7. For water resources, the following statement is incorrect (A)

A province rich in water resources is not short of fresh water.

B: The topographical features of our province are high in the middle and low around, and rainwater is easy to run off.

Increasing the coverage area of forest and grassland can effectively keep the water in the land.

D In coastal areas such as Haikou, excessive use of groundwater will lead to seawater intrusion.

8. The following statement is wrong (c)

A. the celestial bodies in the universe are constantly moving.

People divide the stars in the sky into different constellations just to make it easier for people to remember the stars.

C people divide December into different constellations, and people who belong to different constellations at birth have different fates.

D in the universe, not all stars revolve around the sun.

9. In the tail gas emitted by automobiles, the gas that has a bad influence on the environment is (A).

A. carbon dioxide B. oxygen C. nitrogen D. water vapor

Two, true or false (2 points for each question, a total of 20 points)

1. The bigger the magnifying glass, the better the magnifying effect. (×)

All microorganisms are harmful to human beings. (×)

If you put a drop of water in the pond under a microscope, you will find that there are many things in the water, but if you put a drop of mineral water under a microscope, there are no impurities in the water. (×)

The best way to dispose of garbage is to bury it in time. (×)

If you see the curved moon at five or six in the morning, it means the end of the lunar calendar. (√)

6. Ozone is what we usually call oxygen. (×)

The moon is the only natural satellite on the earth. (√)

8. The phases of the moon change regularly. (√)

3. Fill in the blanks (2 points for each question, 40 points in total)

1. Microorganisms in the soil can decompose dead animal and plant carcasses and residues and turn them into plants that need nutrients.

For the earth, the function of ozone layer is to prevent a lot of sunlight and ultraviolet rays from reaching the ground. If the ozone layer is destroyed, it will increase the incidence of human respiratory diseases, skin cancer, cataracts and other diseases.

3. Observe the fruits, roots, stems and leaves of plants under a microscope. Specimens should be cut into thin and transparent slices for observation.

Before the invention of the microscope, human beings mainly relied on five sensory organs: eyes, nose, tongue, ears and skin to explore and understand the world.

Reducing discard is the way to solve the garbage problem from the source.

The gravity on the moon is about 1/6 of that on the earth.

7. The biggest feature of the lunar terrain is the crater.

9. In the solar system, the planet where life is known is the Earth.

10. There are many stars and planets in the universe. Relatively speaking, the remarkable feature of stars is that they can emit light, while the remarkable feature of planets is that they can't emit light, but they can reflect sunlight.

11.In 2003, China successfully launched its first manned spacecraft. The name of this spaceship is Shenzhou 5.

Four, short answer questions (5 points for each question, a total of 10)

1. What is the significance of the invention of magnifying glass and microscope to human beings?

A: It enables human beings to observe, study and make use of the microscopic world invisible to the naked eye, expands and extends human vision and promotes the development of human civilization.

2. The greenhouse effect is a big problem facing mankind. In daily life, what behaviors of people will produce the greenhouse effect?

A: In daily life, for example, (1) consumes a lot of petrochemical fuels such as oil, coal and natural gas; (2) Rapid population growth; (3) Deforestation of trees and destruction of forests and grasslands.