Ask junior high school biology questions (preferably with answers, or without them)

1. Multiple choice questions: 1. Animals live in different environments and their actions are different. The movement mode of domestic pigeons is a. Flying B. Crawling C. Swimming D. Climbing.

2. China is one of the countries with the richest biological species, with a large number of rare animals and plants. Among the following four animals, which one is a rare animal unique to China? A. kangaroo B. Chinese alligator C. polar bear D. penguin

Xiao Xin's gums often bleed when she brushes her teeth recently. He can be recommended to eat more foods rich in vitamins A, B, C, D and D.

4. Which of the following statements can't correctly describe the trend of biological evolution A. From simple to complex C. From aquatic to terrestrial B. From low to high D. From underground to ground.

5. Which of the following physiological processes causes starch in wheat? A. absorption B. respiration C. transpiration D. photosynthesis

6. Mature red blood cells are rich in hemoglobin. Hemoglobin is easy to combine with oxygen in places with high oxygen content and easy to separate from oxygen in places with low oxygen content. What is the main function of red blood cells? A. carrying blood cells B. transporting oxygen C. phagocytosis D. hemostasis and coagulation.

7. Reflection can be divided into unconditional reflection and conditional reflection. Which of the following four reflex activities belongs to unconditional reflex? The puppy performs arithmetic on the stage. B. Students enter the classroom to prepare for class after hearing the bell. C. Newborn babies suck. After hearing the teacher call his name, Xiaoming stood up to answer the question. 8. Different manifestations of the same trait of the same organism are called relative traits. Among the following traits, the ones that belong to opposite traits are A. Single eyelid and double eyelid of human beings C. Round grain of kidney bean and tall stalk of pea B. Black hair and short legs of sheep FC1d. White hair of rabbits and cats.

9. Xiao Hao and his cousin went to register for marriage and were told that the marriage law of our country prohibits consanguineous marriage because it is consanguineous marriage.

Marriage A. offspring will get genetic diseases C. offspring will be ugly B. offspring will get AIDS D. offspring are more likely to get genetic diseases.

10. The adults of frogs can live on land and water, and their tadpoles live on land, water and air.

1 1. Which of the following methods can be used to keep milk fresh? A. pasteurization B. drying C. smoking D. curing

12. Among the following diseases, those that are not infectious diseases are A. Myopia B. Influenza C. "SARS" D. AIDS.

13. When using an ordinary optical microscope, which of the following structures can be rotated to greatly lift the lens barrel? A. converter rotation 14. Which scientist put forward the theory of natural selection? A. Pasteur B. Darwin C. Mendel D. Newton B. Shader C. Coarse quasi-focus screw D. Fine quasi-focus screw

15. Scientists divide organisms into several fields according to similarity, and each field is divided into six smaller levels: phylum, class, order, family, genus and species. Among them, the most basic taxon is phylum A, B, C and genus D.

16. Yogurt is suitable for all ages. Which of the following organisms is used to ferment milk? A. white radish B. virus C. lactic acid bacteria D. mushrooms

17. After entering adolescence, a series of normal physiological phenomena will appear in the human body, such as a. long beard B. prominent Adam's apple C. nocturnal emission D. menstruation.

18. Teenagers are in a period of vigorous growth and development and need a variety of nutrients. Please choose a reasonable and economical lunch recipe for yourself. A, a box of milk, an egg, a cup of ice cream B, a bowl of rice, a piece of fried meat, a piece of braised hairtail, a bowl of bean curd soup, a green vegetable, a fruit C, a meat bun, a piece of braised meat, a bottle of coke and a piece of chocolate.

A bowl of rice, a lobster, a grass carp, a roast chicken, a bowl of sliced pork soup and a green vegetable. A healthy lifestyle is conducive to improving the quality of life. The following options belong to a healthy lifestyle: a. Stay up late to study until dawn; C. lose weight without breakfast; B. drink too much and forget your worries; D. not picky eaters, reasonable nutrition.

20. Organs are composed of different tissues in a certain order. The following belong to organs: a. oral epithelial cells B. muscle tissue C. liver D. nervous system.

2 1. It is a. cell membrane B. sex chromosome C. cytoplasm D. mitochondria that play a decisive role in human sex.

22. Scientists have successfully implanted human antiviral interferon gene into the DNA molecule of tobacco cells, which has enabled tobacco plants to acquire antiviral ability. This fact shows that the basic unit of controlling biological characters on DNA is A. Gene B. Sugar C. Fat D. protein.

23. Regarding the protection of biodiversity, the following practices are correct: a. Sparrows will steal food, so they will be extinct; B. establishing nature reserves; C. introduce some exotic species without demonstration; D. Hunting and killing animals under first-class national protection for medicine; 24. Figure 1 shows the digestibility of starch, fat and protein in various parts of the digestive tract. Please judge according to the picture: the position where starch was first digested was a. Oral cavity B. Esophagus C. Small intestine D. Large intestine.

25. Coal is a non-renewable resource, which is mainly formed by the remains of the following ancient plants that have been in the stratum for a long time? fc 1？ Algae plants. Non-multiple choice questions: 26. Severe drought occurred in a certain area, which led to crop yield reduction or even no grain harvest. This phenomenon shows that plants need to survive. pteridophyte

27. In 2000, the World Health Assembly decided to officially designate June 14 as World Blood Donor Day. Our country began to carry out meaningful activities of giving love from 1998 10+00. Blood donation system. We should take an active part in such activities.

28. Motherly love is great, and the mother's hard work begins with pregnancy in October. The place where the fetus develops in the mother is.

29. As shown in Figure 2, the power organ of human blood circulation is

.

The valve in this organ can stop blood, so blood flows out of the ventricle in this organ.

Scientists divide animals into two categories according to whether there are thorns in their bodies: one is invertebrates; The other is for animals. Animal common locust

3 1. Immunity can be divided into nonspecific immunity and specific immunity. Vaccination with chickenpox vaccine can prevent people from getting chickenpox, which belongs to sexual immunity.

32. In life, a person's hand will retract quickly if it is accidentally pricked by a needle. This phenomenon is called in biology, and the neural structure that completes this physiological phenomenon is.

33. Students in the biology interest group should test the germination rate of seeds. The necessary external conditions they provide for seed germination are: sufficient air and suitable conditions, and seeds cannot germinate. 34. Food contains sugar and quality. Among them, protein, water, inorganic salts and vitamins are suitable. Lack of any outside world.

It is an important raw material for human growth and development, tissue renewal and repair. Plants. Pine nuts are bare, and there is no peel outside to wrap plants.

35. Seed plants are divided into gymnosperms and angiosperms, and Pinus belongs to seed plants.

When spring comes, flowers are red and green. Fig. 3 is a schematic diagram of "flower development results". Please look at the picture and answer: the fruit of the peach is in the pistil, and the seeds are developed by the development in the pistil.

Please judge: (tick "√" correctly and "×" wrongly) (1) Family planning is a basic national policy of our country ().

Scientist Yuan Longping is known as "the father of hybrid rice". We must cherish life and refuse drugs. All bacteria can make people, animals and plants sick. The biosphere is the largest ecosystem. Only insects can fly in the sky.

( ( ( ( (

) ) ) ) )

38. Please observe Figure 4 and connect the structure and corresponding functions of eggs with lines:

Eggshell yolk blastoderm air chamber

Provide main nutrition for embryo development, provide oxygen for embryo development and protect egg cells.

39. The cell is the basic unit of the structure and function of an organism. Fig. 5 is a plant cell model diagram. Please answer the following questions according to the picture: (1) The genetic information base in the cell is (2) the structure that can control the substances to enter and leave the cell is (3) the place where plants carry out photosynthesis is [a]. . .

40. You and your peers are entering the most important growth and development period in your life-adolescence. By puberty, the height, physiology and psychology of boys and girls have changed significantly. Do you feel these changes from fc 1? Please analyze Figure 6 and answer the following questions.

(1) From the curve in Figure 6 -A, we can see the growth rate of adolescent height after puberty. (2) From the curve in Figure 6 -B, we can see that the ovaries of men and women develop rapidly after puberty. .

(3) As can be seen from Figure 6, the average age of women entering puberty is 4 1. Read the following story about snakes and crops, then answer this question.

A tsunami occurred along the coast of Guangdong, and many fields were submerged by seawater. After the flood, there was no good harvest of crops there, which was the case for several years in a row. Even if the weather is favorable, it has not improved. Later, the old farmer came up with an idea. They had people buy a batch of snakes from other places and put them in the fields. Strange to say, the crops had a bumper harvest that year. People don't understand what this is. The old farmer revealed the secret. It turned out that the flood drowned the snake hidden deep in the cave, but the vole swam to the trees and hillside and saved his life. Later, when the flood receded, the voles returned to the fields to spoil the crops. No snakes caught them. They multiplied so fast that the crops were ruined by voles. Now there are snakes in the field, a large number of voles are eaten by snakes, and crops have a good harvest. The field in the story is an ecosystem, in which the relationship between eating and being eaten constitutes a food chain. Please write the food chain in the story. (2) The producers in this ecosystem are in this food chain; (3) Animals such as snakes in this food chain belong to the ecosystem) → ()→ (. Who? )

(4) This story tells us that there is a limit to the self-regulation ability of an ecosystem, and when external interference exceeds this limit, it will destroy the ecosystem.

42. The following figure is a schematic diagram of chromosome changes during human reproduction (incomplete). Please answer the following questions according to the pictures.

(1) The symbol ""in the figure represents chromosomes, and A and A represent (2) during the formation of sperm (or egg), the bands in each pair of chromosomes in somatic cells enter sperm (or egg). (3) The characteristics of chromosome composition are as follows.

(4) If the fertilized egg in the picture develops into a boy in the future, please write down the sex chromosome composition in the following cells: fertilized egg, mother's somatic cell, father's somatic cell XY; Sperm, oocyte X.

Reference answer 1. Multiple choice questions: 1. A8.A 15。 D22.A2.B9.D 16。 C3 C4 . D5 . D6 . B7 . c 14。 B2 1.B。

10.B 1 1。 A 12。 A 13。 C 17。 D 18。 B 19。 D 20。 C

23.B 24。 A handful of 25. B 27。 Free 30. Vertebrate invertebrates 28. Uterus 3 1. special

Second, non-multiple choice questions: 26. Water 29. Heart 32. Reflex arc atrium

33. The water temperature is 35. Naked quilt (4) × 36. Ovary (5) √ ovule (6) × ovule

34. Lipoprotein 37. (1) √ 38. Eggshell yolk blastoderm air chamber 39. (1) nucleus √ 2.

⑶ √

Provide main nutrition for embryo development, provide oxygen for embryo development to protect egg cells (2) cell membrane (3) chloroplast (2) spermatic vole (mouse) → snake (3) consumption (4) balance (stability) (3) small (early) and so on.

40.( 1) Speed up (similar answers are also acceptable) 4 1. (1) crops (grass and plants) → (2) crops (grass and plants).

42.( 1) Genes (2)-(3) are from the father and one from the mother (4) xy xx y.

Remarks: I wonder if this set of eighth grade exam questions can help you.