1. Watermelon and watermelon seeds that we often eat belong to plants respectively: (a)

A fruits and seeds B stems and seeds C stems and fruits D seeds and fruits

2. The tough "ribs" on both sides of the beans, the "silk winding" on the pigtails of oranges, and the "loofah gourd ladle" of the old loofah. Actually: (d)

Catheters and sieve tubes are between A cells of thick-walled C peel of D fruit and skin B cells.

3. If a tomato plant is shorter and thinner than other plants and its leaves are yellow, it can be judged that the tomato plant is element deficiency disease: (b)

A potassium fertilizer b nitrogen fertilizer c phosphorus fertilizer d boron

4. Under what circumstances must a virus live (C)

A air b soil c living cells d water

5. When observing the specimen with a microscope, the change of visual field from low power lens to high power lens is: (d)

The visual field becomes brighter and the number of cells increases. B the visual field becomes brighter and the number of cells decreases.

C the visual field darkens and the number of cells increases; The visual field darkens and the number of cells decreases.

6. When cutting watermelons and tomatoes, the juice is (B).

A water b cell fluid c cytoplasm d vacuole

7. Boil spinach in water for a few minutes, and the water turns into soup with spinach flavor, indicating that spinach cells are scalded to death by water, and the substances in the cells flow into the water. If spinach is soaked in cold water, cold water won't turn into vegetable soup. What structure in living cells prevents the outflow of substances? (3)

A nucleus b cell wall c cell membrane d cytoplasm

8. Pathogenic microorganisms causing poliomyelitis are: (b)

Bacterial b virus c fungus d vaccine

9. Physiological processes closely related to the normal growth and development of organisms are: (d)

A cell division, B cell differentiation, C cell growth, D. All of the above.

10. "In April, the beauty of the world is exhausted, and the peach blossoms in the mountain temple." The correct explanation for this natural phenomenon is: (c)

A peach varieties are different, and B light affects peach blossom.

The temperature affects peach blossoms. The air in D Mountain Temple is thin, which affects peach blossoms.

1 1 ... In a relatively closed ecosystem composed of grasslands, deer and wolves, if the wolves are extinct, the number of deer will be (D).

A rises rapidly, B rises slowly, C remains relatively stable, and D rises first and then falls.

12. In the structure of root tip, epidermal cells protrude outward to form root hairs, and ducts appear inside this part, which is (D).

A root cap b meristem c growth zone d mature zone

13. the energy converter that can convert light energy into chemical energy is (b)

A nucleus b chloroplast c mitochondria d cytoplasm

14. About this survey, the incorrect statement is (c).

A census is also a survey, and B forest resources inventory is also a survey.

C investigate the objects one by one, and D collate and analyze the survey results.

15. When exploring the environmental conditions of seed germination, some seeds still cannot germinate after all environmental conditions are met. The reasons are (1)

A seed doesn't have its own conditions, B doesn't have suitable temperature, C doesn't have certain moisture, and D doesn't have enough air.

16. Large-scale afforestation not only beautifies the environment, but also promotes the water cycle in the biosphere, because (a)

A increases the atmospheric temperature and rainfall, b increases the oxygen content in the air, c absorbs more carbon dioxide, and d increases the air temperature.

17. As the saying goes, "water flows downwards", but the water in plants is from bottom to top, and the driving force of its transportation is (D).

A, solar energy b, osmosis c, energy d generated by plants, tension generated by transpiration.

18. The main purpose of people planting trees and grass on river banks, hillsides and sandy land is (b).

A beautify the environment, b conserve water and soil, c graze animals, and d obtain firewood or trees.

19. In the corn flowering season, which of the following weather is most likely to lead to yield reduction? (1)

A continuous rain, low temperature B low temperature, little rain C clear sky in Wan Li, cool breeze D windy in autumn.

20. Spirogyra can't be seen in the river in winter, but it can be seen floating on the water in spring. The reasons for this phenomenon are (1)

A, the photosynthesis of Spirogyra is vigorous; B, the temperature of the river is rising.

The specific gravity of Spirogyra is smaller than that of water. D in spring, respiration is strengthened, and a large amount of carbon dioxide is released.

2 1. A seed can become a complete plant. From the analysis of seed structure, it is mainly because there is (C) in the seed.

The seed coat protects the cotyledon or endosperm of seed B and stores nutrients.

C mature and complete embryo D radicle develops and goes deep into the soil.

22. Transplanted plants should be transplanted at the seedling stage as far as possible, with soil, because (c)

A reduces the loss of water, b prevents the loss of nutrients, c reduces the loss of young roots and hairs, and d prevents plants from adapting to the environment.

23. Cut off the stems of dandelion and other plants, and the white juice oozes from the cross section of the stem and flows out from (a).

Catheter b screen c forms d skin.

24. The main reason for the poor growth of crops planted in saline-alkali land is (D)

A soil is short of fertilizer, and B soil solution concentration is small.

C saline-alkali soil is anoxic, and D soil solution concentration is high.

25. If the pistil of peach blossom A is removed before flowering, the stamen of peach blossom B is removed, and peach blossom C is not treated. Wrap flowers A, B and C in transparent plastic bags, and tie the bag mouth tightly. The result is (d).

A can't result, B can't result, C can result, B can result, B can result, C can't result.

C A cannot result, b can result, c can result, D A cannot result, b cannot result, and c cannot result.

1. Fill in the blanks (every space 1 minute * * *1minute)

26. The life activities of organisms are based on the life activities of cells, which are the structure of organisms.

And the basic unit of function.

27. Cell growth increases cell volume and cell division increases cell number. Cell differentiation is accompanied by cell growth.

28. Transpiration refers to the process in which water in plants is emitted from leaves to the atmosphere in a gaseous state.

Three. True or false (65438+ 0 points for each small question ***5 points)

All plant cells are the same in shape, size and structure. (Ⅹ)

30. When observing the temporary loading, the reason why the stage can't be tilted is to facilitate aiming. ( Ⅹ )

3 1. The body of paramecium consists of only one cell, so paramecium cannot perform complex functions such as digestion and excretion. ( Ⅹ )

32. Different plants have different water requirements, and the same plant has different water requirements in different periods. ( √ )

33. In the experiment of baking seeds, the water droplets on the wall of the test tube came from dried seeds. ( √ )

5. Inquiry experiment: This question is *** 15.

34. Here is a group of students doing an experiment "The influence of light on the life of mouse and girl".

The following is their operation process.

Cover the box with a layer of paper first. Paper is wet when it is dry. Put 10 mice on the left side of the box. Then cover the glass plate, and then cover one side of the glass plate with a book to block the light. Let it stand for two minutes, and then start counting. Count the number of rats and women in the bright and dark places once a minute, counting 10 times.

(1) Please find out the mistakes in their experimental operation and explain the reasons: (2 points)

A: The control of dry and wet conditions has nothing to do with the experiment of "the influence of light on the life of mice and girls". The addition of dry and wet conditions will affect the scientific nature of this experiment.

(2) Why use 10 mice instead of only one mouse? (2 points)

A: Using 10 rats to do experiments can increase the reliability of experiments, eliminate contingency and enhance the accuracy of experiments.

(3) Why should we set the light and dark environment? (2 points)

Answer: because the experimental variable of "the influence of light on the life of mice and girls" is the intensity of light, and bright and dark are the control groups with different brightness.

35. This figure is a schematic diagram of a device for exploring the external conditions of seed germination. Answer the following questions according to the picture. (65438+ 0 point per grid)

The reason why the seeds of (1) 1 can't germinate is water shortage.

The reason why No.3 in the picture can't germinate is the lack of air. No.5 seed in the picture can't

The reason for germination is that the temperature is not suitable.

(2) The reason why No.2 seed germinates in the picture is that it meets the requirements of water, air and suitable temperature.

(3) The above experiments show that seeds should not only meet their own conditions to germinate.

Embryo is full of energy and nutrition, but it also needs to meet external conditions such as water, air and suitable temperature.

(4) If No.2 seed didn't germinate, please guess what the possible reason is? Maybe the embryo is not alive. (2 points)

Six. Short answer analysis questions: (20 points)

36. The following passage is taken from Mr. Lu Xun's "From Baicaoyuan to San Tan Yin Yue". Answer this question after reading it.

Needless to say, green vegetables, smooth stone wells, tall acacia trees and purple mulberries; Needless to say, cicadas sang in the leaves, fat wasps squatted on cauliflower, and the clever son of heaven suddenly rushed to the sky from the grass. Just around the short mud wall, it has unlimited interest. Oil flies sing here and crickets play the piano here. Turning over broken bricks, sometimes I meet centipedes; There is also Mylabris. If you press your finger on its spine, it will smack and spray a puff of smoke from behind. The vines of Polygonum multiflorum Thunb and Manglietia are intertwined, Manglietia has the fruit of Lotus House, and Polygonum multiflorum Thunb has swollen roots. ..... If you are not afraid of thorns, you can also pick raspberries, which are sour and sweet, and the color and fragrance are far better than mulberries.

(1) There are biological and abiotic factors that affect the survival of crickets in a herbaceous garden. The former includes animals and plants, while the latter includes sunshine, air, water, soil, suitable temperature and a certain living space. (2 points for each space)

(2) Crickets can't live without grass and land, indicating that living things must rely on suitable environment to survive. (2 points)

(3) The food chain is a kind of relationship among various organisms in the ecosystem through food relationship. Please write down a food chain in the ecosystem of Herbal Garden, and indicate the energy flow direction with arrows. (5 points)

Grass → cricket → centipede.

2. "Don't you see how the water of the Yellow River flows down from the sky into the ocean and never comes back?" This is a famous poem by Li Bai, a great poet in the Tang Dynasty. Try to analyze these two poems from the perspective of biosphere water cycle. (5 points)

A: Ocean evaporation, surface evaporation and plant transpiration can form cumulonimbus clouds in the sky, thus producing rainfall. Some rainwater seeps into the soil to replenish groundwater, while others return to rivers, lakes and oceans, forming a cycle of water circulation in the biosphere. Li Bai, a great poet in the Tang Dynasty, "Didn't you see how the water of the Yellow River went out of the sky into the sea and never came back?" Although the description of nature in his famous poems is very imposing, there are still some shortcomings. I think the water of the Yellow River flowing to the sea will return to the Yellow River because of the evaporation of the ocean. Therefore, the description of the word "no return" is unscientific and fails to correctly express the water cycle of the biosphere. There is indeed room for revision.