Junior one biology final exam questions

1, the following belongs to the biological is ()

A. dinosaur skeleton coral coral stalactites

2, "good rain knows the season, when spring happens. What factors are mainly described in the poem "Sneaking into the night with the wind, moistening things silently"

Biological life? ( )

A, season b, water c, biology d, human beings

It will be cooler in the shade when the weather is hot. This shows: ()

A. the environment affects the survival of living things. Biology can adapt to the environment.

C. bioenergy affects the environment D. Biological factors and abiotic factors are inseparable.

At the turn of autumn and winter, people are prone to influenza. What causes people to get sick is influenza virus, which belongs to () in the ecosystem.

A. producer B. consumer C. decomposer D. none of the above

5, the following options, can be regarded as an ecosystem is ()

A. Fish in the sea B. Pine trees in the forest C. Air in the forest D. Miyun Reservoir

6, in the experimental design, the following options can't be used as a set of control is ()

A, 25℃ and 0℃ B, presence of light c, presence of air d, temperature and humidity.

7. Farmers need to cover cotton seeds with plastic film in early spring, mainly for ()

A. increase soil temperature B. increase light intensity C. supplement air D. all of the above.

8, constitute the basic unit of human structure and function is ()

A. cell b, tissue c, organ d system

9. When observing onion skin with microscope, observe the same part of onion skin with 10× eyepiece and 10× objective lens and 10× eyepiece and 45× objective lens successively, and compare the results twice.

A. It's all inverted images, the field of vision changes from bright to dark, and the number of cells changes from less to more.

B: It's all inverted images, the field of vision changes from bright to dark, and the number of cells changes from small to small.

C. they are all positive images, the field of vision changes from dark to bright, and the cell image changes from big to small.

D. they are all positive images, the field of vision changes from bright to dark, and the cell image changes from small to large.

10, in the future, if you travel to the moon with astronauts in a spaceship, you will have left the biosphere by then, but you must bring enough substances necessary to maintain your life activities from the biosphere, which should at least include ().

A. oxygen bags, mineral water, various foods B. solar cells, thermal underwear.

C. Pet cats, computers, CDs, mosquito repellent, potted flowers and cameras

1 1. Now scientists have successfully cultivated cardiomyocytes from stem cells, and the reason for this change may be the result of ().

A. Cell division, B cell growth, C cell maturation and D cell differentiation

12, when planting flowers or crops, it is necessary to loosen the soil frequently, mainly because ()

A. promoting root system to absorb water B. preventing water evaporation

C. beneficial to root respiration D. slow down transpiration

13, there is a food chain of "algae → shrimp → small fish → big fish" in the water. If the water is polluted by DDT, the DDT content in the following organisms is the most ().

A. algae B. shrimp C. small fish D. big fish

14, the following statement about cell division is wrong ().

A. The cytoplasm divides first, from one to two. B. the nucleus divides first and divides into two.

C. when the nucleus divides, the chromosome changes are the most obvious. D the chromosome morphology and number of the new cells are the same as those of the original cells.

15. In the biosphere, the energy converters in maize plants and human bodies are () respectively.

A, chloroplasts and mitochondria b, chloroplast mitochondria

C, mitochondrial mitochondrial d, mitochondrial chloroplast

16. In the proverbs describing peanuts, "hemp house", "red curtain" and "white fat man" refer to () in turn.

A. pericarp, seed coat and endosperm B. pericarp, seed coat and embryo

C. Ovary, seed and embryo D. Fruit, seed and ovule

17, "The West Lake is spring, and the spring water is green." What kind of plants does "green" here mainly refer to ()

A. algae, bryophytes, ferns, seed plants

18, some students classified rice, watermelon and pine as one class, and kelp, liverworts and ferns as one class. The basis of his classification is ()

A, with or without roots B, with or without seeds

C, aquatic or terrestrial D, with or without fruit

19. Which of the following structures is developed from peanut seeds ()

A. fertilized egg B. egg cell C. ovary D. ovule

20. The annual () in China is Arbor Day.

A.65438+1 0 month 1 day b month 12 day c month 1 day d. 65438+ 10 month/day.

Second, multiple-choice questions (***60 points)

(3) Do people belong to ("producer", "consumer" or "decomposer") in the ecosystem?

3.( 16) A biological interest group did the experiment of "Exploring the environmental conditions of corn seed germination": put the same amount of cotton in four beakers A, B, C and D, then put the same amount of corn seeds on them, and cultivate them under the following conditions, and record the experimental results.

group

The environment in which the seeds are located

experimental result

first

Dry cotton, put it in a cupboard at 25℃

Seeds do not germinate.

second

Wet cotton, put in a cupboard at 25℃

germination

The third/third in ten days' work

Wet cotton, put in the refrigerator (4℃)

Seeds do not germinate.

man

Cotton and seeds are completely immersed in water and put in a cabinet at 25℃

Seeds do not germinate.

Try to analyze and answer:

(1) Through this experiment, we can see that device B played the role of _ _ _ _ _; In order to prove that "temperature is the environmental condition that affects seed germination", _ _ _ _ _ device can be selected.

(2) If you want to explore "the influence of light on corn seed germination", how do you think to design the experiment?

___________ ___________。

(3) When transplanting corn seedlings, you need to bring a piece of soil. The purpose of this is: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

(4) When breaking the ear of corn, it was found that the ear of corn was short of grain because of _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

(5) In the actual production process, in order to make full use of sunlight in the process of photosynthesis and increase yield, it should be done.

5.( 12) Answer the following questions according to the knowledge of photosynthesis:

(2) The biosphere is threatened by carbon-oxygen imbalance (greenhouse effect). What is the reason? What measures should be taken? Talk about your opinion (at least two reasons and two measures) (8 points)

Reference answer

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1 1— 15D C D A A 16—20 B A B C B

1, (1) supports and protects (2) cell membrane (3)⑤ vacuole (4)④ nucleus (5) cell wall and vacuole.

2.( 1)A B C(2) Eating and being eaten (3) Consumers (4) A → B → C.

3.( 1) Compared with B and C, a certain amount of water, sufficient air and suitable temperature.

(2) Put the same amount of wet cotton into the same two beakers respectively, and then put the same amount of corn seeds, with one beaker under the illumination of 25℃ and the other beaker under the dark environment of 25℃.

(3) Protecting the root hairs in mature areas (4) Artificial pollination due to insufficient pollination (5) Reasonable close planting.

4, ④ green, yellow, white and ⑥ blue.

(1) makes the original organic matter in the leaves exhausted or transported away.

(2) Decolorization (or dissolving chlorophyll in leaves)

5.( 1) Chloroplast oxygen

(2) The reason of carbon-oxygen imbalance is 1. Factories, cars, planes and ships have increased rapidly, and humans use a lot of fuel, and the carbon dioxide discharged into the atmosphere has greatly increased; 2. Human activities have caused a lot of damage to vegetation.

Measures to be taken 1. Seek international cooperation to limit carbon dioxide emissions.

2. Planting trees and protecting vegetation