四年级英语食物链与生态系统练习题40题(带答案)

四年级英语食物链与生态系统练习题40题(带答案)
1.Which animal is at the top of the food chain?
A.Rabbit
B.Lion
C.Grasshopper
答案解析：B。

狮子是食肉动物，在食物链中处于较高位置，通常处于顶端。

兔子是食草动物，在食物链中位置低于狮子。

蚱蜢也是食草动物，在食物链中的位置更低。

2.Which animal eats grass?
A.Tiger
B.Cow
C.Eagle
答案解析：B。

牛是食草动物，吃草。

老虎是食肉动物，不吃草。

鹰也是食肉动物，不吃草。

3.Which animal is a predator?
A.Deer
B.Wolf
C.Squirrel
答案解析：B。

狼是食肉动物，是捕食者。

鹿是食草动物，不是捕食者。

松鼠主要吃坚果等，也不是捕食者。

4.Which animal is prey for many predators?
A.Mouse
C.Fox
答案解析：A。

老鼠是很多捕食者的猎物。

猫头鹰和狐狸是捕食者。

5.Which animal lives in the water and is part of the food chain?
A.Frog
B.Cat
C.Bird
答案解析：A。

青蛙既可以生活在水中也可以生活在陆地上，是食物链中的一部分。

猫和鸟主要生活在陆地上。

6.Which animal eats insects?
A.Chicken
B.Horse
C.Pig
答案解析：A。

鸡会吃昆虫。

马主要吃草。

猪主要吃食物残渣等。

7.Which animal is a herbivore?
A.Bear
B.Rabbit
C.Snake
答案解析：B。

兔子是食草动物。

熊是杂食动物。

蛇是食肉动物。

8.Which animal is a carnivore?
A.Duck
C.Sheep
答案解析：B。

老虎是食肉动物。

鸭子和羊是食草动物或杂食动物。

9.Which animal is important for pollination and also part of the food chain?
A.Bee
B.Cow
C.Dog
答案解析：A。

蜜蜂对于授粉很重要，同时也是食物链中的一部分。

牛和狗不是主要的授粉者。

10.Which animal eats both plants and animals?
A.Owl
B.Panda
C.Hippo
答案解析：B。

熊猫既吃竹子等植物也吃小动物等。

猫头鹰是食肉动物。

河马主要吃草。

11.The sun is very important for plants because it provides_____.
A.water
B.air
C.light
D.soil
答案解析：C。

太阳为植物提供光，水不是太阳提供的，空气也不是太阳提供的，土壤更不是太阳提供的。

12.Water is a necessary part of the ecosystem. Animals need water to_____.
A.eat
B.sleep
C.drink
D.play
答案解析：C。

动物需要水来喝，不是用来吃、睡觉或者玩。

13.Air is important for living things because it contains_____.
A.oxygen
B.water
C.sunlight
D.soil
答案解析：A。

空气中含有氧气，对生物很重要。

水、阳光和土壤不是空气中含有的。

14.Plants need_____to make food.
A.water
B.air
C.sunlight
D.all of the above
答案解析：D。

植物需要水、空气和阳光来制造食物。

15.Without_____, there would be no life on Earth.
A.water
B.air
C.sunlight
D.any of the above
答案解析：D。

没有水、空气和阳光中的任何一个，地球上就不会有生命。

16.The air we breathe is made up of mainly_____.
A.oxygen and nitrogen
B.water and carbon dioxide
C.sunlight and soil
D.plants and animals
答案解析：A。

我们呼吸的空气主要由氧气和氮气组成。

水和二氧化碳不是空气的主要成分，阳光和土壤不是空气的组成部分，植物和动物也不是空气的组成部分。

17.Water is important for plants because it helps them_____.
A.grow
B.sleep
C.fly
D.run
答案解析：A。

水对植物很重要，因为它帮助植物生长。

植物不会睡觉、飞或者跑。

18.Sunlight is needed for plants to carry out_____.
A.respiration
B.digestion
C.photosynthesis
D.movement
答案解析：C。

阳光是植物进行光合作用所需要的。

呼吸、消化和运动都不是靠阳光进行的。

19.Animals need air to_____.
A.make food
B.breathe
C.swim
D.climb
答案解析：B。

动物需要空气来呼吸。

动物不是靠空气来制造食物、游泳或者攀爬。

20.Without sunlight, plants cannot_____.
A.grow
B.sleep
C.dance
D.sing
答案解析：A。

没有阳光，植物不能生长。

植物不会睡觉、跳舞或者唱歌。

21.The relationship between bees and flowers is _____.
petition
B.symbiosis
C.predation
答案解析：B。

蜜蜂和花朵之间是共生关系，蜜蜂从花朵中采集花蜜，同时帮助花朵传粉。

选项A 竞争关系不符合；选项C 捕食关系也不对。

22.Two plants growing in the same place and competing for sunlight and water have a _____ relationship.
petitive
B.symbiotic
C.predatory
答案解析：A。

两株植物在同一地方生长并争夺阳光和水分是竞争关系。

选项B 共生关系不符合；选项C 捕食关系不适用。

23.The relationship between a lion and a zebra is _____.
petition
B.symbiosis
C.predation
答案解析：C。

狮子和斑马是捕食关系，狮子捕食斑马。

选项 A 竞争关系不对；选项B 共生关系错误。

24.Trees and birds can have a _____ relationship as birds build nests in trees.
petitive
B.symbiotic
C.predatory
答案解析：B。

树和鸟可以是共生关系，鸟在树上筑巢，树为鸟提供栖息之地。

选项A 竞争关系不合适；选项C 捕食关系不符合。

25.Fish and sharks in the ocean may have a _____ relationship.
petition
B.symbiosis
C.predation
答案解析：C。

海洋中的鱼和鲨鱼是捕食关系，鲨鱼捕食鱼。

选项 A 竞争关系不准确；选项B 共生关系错误。

26.Two wolves hunting for the same prey have a _____ relationship.
petitive
B.symbiotic
C.predatory
答案解析：A。

两只狼追捕同一猎物是竞争关系。

选项B 共生关系不对；选项C 捕食关系不准确，这里强调的是竞争同一食物资源。

27.The relationship between a frog and insects is _____.
petition
B.symbiosis
C.predation
答案解析：C。

青蛙和昆虫是捕食关系，青蛙捕食昆虫。

选项 A 竞争关系不合适；选项B 共生关系错误。

28.Two different species of birds living in the same forest and not interacting much have a _____ relationship.
petitive
B.symbiotic
C.neutral
答案解析：C。

两种不同的鸟生活在同一片森林但很少相互作用是中性关系。

选项A 竞争关系不符合；选项B 共生关系错误。

29.The relationship between a fox and a rabbit is _____.
petition
B.symbiosis
C.predation
答案解析：C。

狐狸和兔子是捕食关系，狐狸捕食兔子。

选项 A 竞争关系不准确；选项B 共生关系错误。

30.Two plants of the same species growing close together may have a _____ relationship.
petitive
B.symbiotic
C.predatory
答案解析：A。

同一物种的两株植物生长得很近可能会有竞争关系，竞争阳光、水分和养分等。

选项B 共生关系不符合；选项C 捕食关系错误。

31. What human activity can damage the balance of ecosystem?
A. Planting trees
B. Hunting wild animals
C. Recycling waste
D. Using solar energy
答案解析：B。

Hunting wild animals can lead to a decrease in the number of certain species, which can disrupt the balance of the ecosystem. Planting trees is beneficial for the ecosystem. Recycling waste and using solar energy are also environmentally friendly activities that do not damage the ecosystem.
32. Which of the following is not a way to protect the ecosystem?
A. Polluting rivers
B. Establishing nature reserves
C. Saving water
D. Reducing plastic use
答案解析：A。

Polluting rivers can harm the ecosystem. Establishing nature reserves, saving water and reducing plastic use are all ways to protect the ecosystem.
33. Human activities like deforestation can cause?
A. Increase in wildlife
B. Better air quality
C. Soil erosion
D. More rain
答案解析：C。

Deforestation can lead to soil erosion as there are no trees to hold the soil in place. It does not increase wildlife or improve air quality. It also does not cause more rain.
34. If people overfish, what will happen to the ecosystem?
A. Increase in other marine species
B. Stable ecosystem
C. Disruption of food chain
D. Better water quality
答案解析：C。

Overfishing can disrupt the food chain as it reduces the number of certain fish species, which can affect the survival of other species that depend on them. It does not increase other marine species or lead to a stable ecosystem or better water quality.
35. What can we do to help maintain the balance of ecosystem?
A. Waste a lot of water
B. Throw trash everywhere
C. Plant more trees
D. Cut down more trees
答案解析：C。

Planting more trees is a way to help maintain the balance of ecosystem as trees provide oxygen, absorb carbon dioxide and support wildlife. Wasting water, throwing trash everywhere and cutting down more trees all damage the ecosystem.
36. Which human activity is good for the ecosystem?
A. Burning fossil fuels
B. Using pesticides
C. Developing renewable energy
D. Dumping industrial waste
答案解析：C。

Developing renewable energy is good for the ecosystem as it reduces the use of fossil fuels and reduces pollution. Burning fossil fuels, using pesticides and dumping industrial waste all harm the ecosystem.
37. If people build too many factories, what might happen to the ecosystem?
A. Improved air quality
B. More clean water
C. Pollution and damage
D. Increase in wildlife
答案解析：C。

Building too many factories can lead to pollution and damage to the ecosystem as factories release pollutants into the air and water. It does not improve air quality or increase clean water or wildlife.
38. What is the consequence of excessive use of fertilizers?
A. Rich soil
B. Healthy plants
C. Water pollution
D. More insects
答案解析：C。

Excessive use of fertilizers can cause water pollution as the fertilizers can run off into water sources. It does not lead to rich soil or healthy plants. It may attract more insects but that is not the main consequence.
39. Human activities such as mining can?
A. Protect the ecosystem
B. Provide more habitats for animals
C. Cause environmental damage
D. Increase the number of plants
答案解析：C。

Mining can cause environmental damage such as soil erosion, water pollution and destruction of habitats. It does not protect the ecosystem, provide more habitats for animals or increase the number of plants.
40. What should we do to reduce the negative impact of human activities on the ecosystem?
A. Drive more cars
B. Use more disposable products
C. Conserve energy
D. Waste more resources
答案解析：C。

Conserving energy can reduce the negative impact of human activities on the ecosystem as it reduces the consumption of fossil fuels and reduces pollution. Driving more cars, using more disposable
products and wasting more resources all increase the negative impact on the ecosystem.。