MCQ Questions for Class 10 Science Chapter 15 Our Environment with Answers

 

1. Which of these organisms are the most important decomposers in an ecosystem?

A. Algae and fungi
B. Fungi and bacteria
C. Algae and bacteria
D. Bacteria and virus

ANSWER= B. Fungi and bacteria

 

2. Which of these does not belong to biotic component?

A. Parasites
B. Fungi
C. Bacteria
D. Soil

ANSWER= D. Soil

 

3. Which of the following is biodegradable?

A. Plastic mugs
B. Leather belts
C. Silver foil
D. Iron nails

ANSWER= B. Leather belts

 

4. Which of the following is non- biodegradable?

A. Wool
B. Nylon
C. Animal bones
D. Tea leaves

ANSWER= B. Nylon

 

5. Which one of the following will undergo fastest bio-degradation?

A. Mango seed
B. Wood
C. Mango peel
D. Mango pulp

ANSWER= D. Mango pulp

 

6. In an ecosystem, herbivores represent

A. producers
B. primary consumers
C. secondary consumers
D. decomposers

ANSWER= B. primary consumers

 

7. Trophic level in an ecosystem represents

A. oxygen level
B. water level
C. energy level
D. salt level

ANSWER= C. energy level

 

8. A food chain comprising birds, green plants, fish and man. The concentration of harmful chemical entering the food chain will be maximum in

A. green plants
B. man
C. birds
D. fish

ANSWER= B. man

 

9. First link in any food chain is usually green plants because

A. they are widely distributed
B. they are fixed at one place in the soil
C. they alone have the capacity to synthesise food using sunlight
D. there are more herbivores than carnivores

ANSWER= C. they alone have the capacity to synthesise food using sunlight

 

10. Which of the following statements about food chain and energy flow through ecosystem is false?

A. Food webs include two or more food chains.
B. All organisms that are not producers are consumers.
C. A single organism can feed at several trophic levels.
D. Detritivores feed at all trophic levels except the producer level.

ANSWER= D. Detritivores feed at all trophic levels except the producer level.

 

11. Which of the following is a logical sequence of food chain

A. producer → consumer → decomposer
B. producer → decomposer → consumer
C. consumer → producer → decomposer
D. decomposerproducer → consumer

ANSWER= A. producer → consumer → decomposer

 

12. Which of the following is an autotroph?

A. Lion
B. Insect
C. Tree
D. Mushroom

ANSWER= C. Tree

 

13. In the garden ecosystem, which of the following are producers?

A. Insects
B. Snakes
C. Grasses
D. Rabbits

ANSWER= C. Grasses

 

14. Which one of the following is an artificial ecosystem? [NCERT Exemplar Problems]

A. Pond
B. Crop field
C. Lake
D. Forest

ANSWER= B. Crop field

 

15. An ecosystem includes [NCERT Exemplar Problems]

A. all living organisms
B. non-living objects
C. both living organisms and non-living objects
D. sometimes living organisms and sometimes nonliving objects

ANSWER= C. both living organisms and non-living objects

 

16. Which of the following is biodegradable waste?

A. DDT
B. Aluminium can
C. Plastic bag
D. Cow dung

ANSWER= D. Cow dung

 

17. Which of the two sets belong to the same trophic level?

A. Rabbit: Tiger
B. Vulture : Rat
C. Grasshopper : Hawk
D. Frog : Lizard

ANSWER= D. Frog : Lizard

 

18. In a given food chain if the amount of energy at the fourth trophic level is 6 kJ, what will be the energy available at the producer level?

A. 6000 kJ
B. 20 kJ
C. 60 kJ
D. 600 kJ

ANSWER= A. 6000 kJ

 

19. Which of the following is the best way for disposal of vegetable and fruit peels?

A. Landfill
B. Recycling
C. Composting
D. Burning

ANSWER= C. Composting

 

20. The problem caused due to ozone hole is

A. earthquakes
B. damage due to UV radiations
C. chemical pollution
D. acid rain

ANSWER= B. damage due to UV radiations

 

21. An ecosystem includes

A. all living organisms
B. non-living objects
C. both living organisms and non-living objects
D. sometimes living organisms and sometimes non-living objects

ANSWER= C. both living organisms and non-living objects

 

22. Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as

A. eutrophication
B. pollution
C. biomagnification
D. accumulation

ANSWER= C. biomagnification

 

23. In an ecosystem, the 10% of energy available for transfer from one trophic level to the next is in the form of

A. heat energy
B. light energy
C. chemical energy
D. mechanical energy

ANSWER= C. chemical energy

 

24. Organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called

A. decomposers
B. producers
C. herbivores
D. carnivores

ANSWER= B. producers

 

25. Excessive exposure of humans to UV-rays results in (i) damage to immune system (ii) damage to lungs (iii) skin cancer (iv) peptic ulcers

A. (i) and (ii)
B. (ii) and (iv)
C. (i) and (iii)
D. (iii) and (iv)

ANSWER= C. (i) and (iii)

 

26. Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the

A. food web
B. ecological pyramid
C. ecosystem
D. food chain

ANSWER= A. food web

 

27. In the given Figure the various trophic levels are shown in a pyramid. At which trophic level is maximum energy available?

A. T4
B. T2
C. T1
D. T3

ANSWER= C. T1

 

28. The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about

A. 1%
B. 5%
C. 8%
D. 10%

ANSWER= A. 1%

 

29. Which of the statements is incorrect?

(а) All green plants and blue green algae are producers
B. Green plants get their food from organic compounds
C. Producers prepare their own food from inorganic compounds
D. Plants convert solar energy into chemical energy

ANSWER= B. Green plants get their food from organic compounds

 

30. The decomposers in an ecosystem

A. convert inorganic material, to simpler forms
B. convert organic material to inorganic forms
C. convert inorganic materials into organic compounds
D. do not breakdown organic compounds

ANSWER= B. convert organic material to inorganic forms

 

31. Disposable plastic plates should not be used because

(а) they are made of materials with light weight
B. they are made of toxic materials
C. they are made of biodegradable materials
D. they are made of non-biodegradable materials

ANSWER= D. they are made of non-biodegradable materials

 

32. What will happen if deer is missing in the food chain given below? Grass → Deer → Tiger

(а) The population of tiger increases
B. The population of grass decreases
C. Tiger will start eating grass
D. The population of tiger decreases and the population of grass increases

ANSWER= D. The population of tiger decreases and the population of grass increases

 

33. When is the world environment day celebrated?

A. 16 June
B. 5 December
C. 5 June
D. 5 July

ANSWER= C. 5 June

 

34. Which of these is a greenhouse gas?

A. Hydrogen sulphide
B. Methane
C. Ozone
D. Carbon monoxide

ANSWER= B. Methane

 

35. The transfer of energy in a food chain is always:

A. Unidirectional
B. Methane
C. Bi-directional
D. Random

ANSWER= A. Unidirectional

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