Our Environment MCQ Quiz

30 questions

1. The two components of an ecosystem are

   1. living and dead
   2. biotic and abiotic
   3. plants and soil
   4. water and air

2. Green plants in a food chain are

   1. consumers
   2. producers
   3. decomposers
   4. predators

3. Organisms that break down dead matter are

   1. producers
   2. consumers
   3. decomposers
   4. herbivores

4. Each step in a food chain is a

   1. niche
   2. trophic level
   3. habitat
   4. population

5. The energy transferred to the next trophic level is about

   1. 0.01
   2. 0.1
   3. 0.5
   4. 0.9

6. In a food chain, energy flow is

   1. cyclic
   2. unidirectional
   3. bidirectional
   4. random

7. The increasing concentration of harmful chemicals up trophic levels is

   1. eutrophication
   2. biomagnification
   3. pollution
   4. decomposition

8. Which is a biodegradable substance?

   1. plastic
   2. paper
   3. glass
   4. DDT

9. Which is non-biodegradable?

   1. vegetable peel
   2. plastic
   3. cow dung
   4. paper

10. Ozone (O3) protects us by absorbing

    1. infrared
    2. ultraviolet radiation
    3. visible light
    4. radio waves

11. The chemicals mainly responsible for ozone depletion are

    1. CO2
    2. CFCs
    3. SO2
    4. O2

12. Producers occupy which trophic level?

    1. first
    2. second
    3. third
    4. fourth

13. Herbivores are also called

    1. producers
    2. primary consumers
    3. secondary consumers
    4. decomposers

14. A food web is

    1. a single chain
    2. many interconnected food chains
    3. a producer only
    4. one trophic level

15. Which gas is a greenhouse gas?

    1. nitrogen
    2. methane
    3. oxygen
    4. argon

16. Human beings are most affected by biomagnification because they

    1. are producers
    2. occupy the highest trophic level
    3. are decomposers
    4. eat plants only

17. Decomposers include mainly

    1. insects
    2. bacteria and fungi
    3. birds
    4. fish

18. An ecosystem where humans do not interfere is

    1. garden
    2. crop field
    3. forest (natural)
    4. aquarium

19. Which is an artificial ecosystem?

    1. pond
    2. forest
    3. aquarium
    4. ocean

20. Assertion: The highest concentration of pesticides is in top consumers. Reason: Non-biodegradable pesticides accumulate up the food chain.

    1. Both true, R explains A
    2. Both true, R not explanation
    3. A true, R false
    4. A false, R true

21. In the food chain grass→deer→lion, the lion is a

    1. producer
    2. herbivore
    3. carnivore
    4. decomposer

22. If producers get 10000 J, energy reaching the third trophic level is about

    1. 1000 J
    2. 100 J
    3. 10 J
    4. 5000 J

23. Ozone hole was first noticed over

    1. the Arctic
    2. Antarctica
    3. Africa
    4. Australia

24. Excessive use of pesticides leads to

    1. cleaner soil
    2. biomagnification
    3. more decomposers
    4. better ozone

25. Which of these is a decomposer's role?

    1. make food
    2. recycle nutrients to soil
    3. eat animals
    4. produce oxygen

26. A short food chain transfers

    1. less usable energy at top
    2. more energy at top
    3. no energy
    4. infinite energy

27. Substances broken down by biological processes are

    1. non-biodegradable
    2. biodegradable
    3. inert
    4. radioactive

28. Improper disposal of non-biodegradable waste causes

    1. fertile soil
    2. environmental pollution
    3. more oxygen
    4. ozone repair

29. The number of trophic levels in a food chain is usually limited because

    1. energy decreases at each level
    2. there is no food
    3. organisms die
    4. of ozone

30. Which is the ultimate source of energy for ecosystems?

    1. soil
    2. the Sun
    3. water
    4. wind

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