Chapter 15 Our Environment MCQs for Class 10 Science

Chapter 15 Our Environment MCQs for Class 10 Science

Here students can practice Chapter 15 Our Environment MCQs for Class 10 Science. All the MCQs are divided into several sub-pages. Each page has 40 MCQs, for the next page just scroll down and click on the buttons. Also you can practice Class 10 Science MCQs (Multiple Choice Questions) for other chapters.

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Q 1.: In a food chain, the third tropic level is always occupied by

(A) Carnivores

(B) Herbivores

(C) Decomposers

(D) Producers

Option – (a)

Q 2.: An ecosystem includes

(A) All living organisms

(B) Nonliving organisms

(C) Both living and nonliving organisms

(D) Sometimes living organisms and nonliving organisms

Option – (c)

Q 3.: This is an artificial ecosystem

(A) Pond 

(B) Crop field 

(C) Lake

(D) Forest

Option – (b)

Q 4.: The second trophic level is always of

(A) Herbivores

(B) Autotrophes

(C) Carnivores

(D) Producers

Option – (a)

Q 5.: Trophic levels are formed by

(A) organisms linked in food chain

(B) Only plants

(C) Only animals

(D) Only carnivores

Option – (a)

Q 6.: An agriculture/cropland is

(A) A biome

(B) Natural ecosystem

(C) An artificial ecosystem

(D) a community of plants and animals only

Option – (c)

Q 7.: In natural ecosystem decomposers include

(A) Only microscopic animals  

(B) Only bacteria and fungi

(C) Herbivores and carnivores

(D) Both (a) and (b)

Option – (d)

Q 8.: These are present at maximum number in ecosystem.

(A) Producers

(B) Consumers of first level

(C) Decomposers

(D) Consumers of second level

Option – (a)

Q 9.: Energy flow from one tropic level to another in an ecosystem is

(A) 5%

(B) 10%

(C) 15%

(D) 20%

Option – (b)

Q 10.: Increasing accumulation of DDT in higher trophic level of a food chain is

(A) Biotic potential

(B) Biotic influence

(C) Biomagnification

(D) Bioconcentration

Option – (c)

Q 11.: This is biodegradable.


(B) Cow dung

(C) Polythene

(D) Plastic

Option – (b)

Q 12.: Driving force of an ecosystem is.

(A) Carbohydrates

(B) Biomass


(D) Solar energy

Option – (d)

Q 13.: In a food chain, energy flow is.

(A) Unidirectional

(B) Bidirectional

(C) Multidirectional

(D) No definite pattern

Option – (a)

Q 14.: A pond ecosystem is.

(A) Natural

(B) Hydrological

(C) Artificial

(D) Abiotic

Option – (a)

Q 15.: This limits the number of trophic levels in a food chain

(A) Decrease in energy at higher trophic level

(B) Deficient food supply

(C) Polluted air

(D) Water

Option – (a)

Q 16.: Which of the statement is incorrect?

(A) 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

Option – (b)

Q 17.: Depletion of ozone layer is mainly due to

(A) Chlorofluorocarbon compounds

(B) Pollution

(C) Methane

(D) Pesticides

Option – (a)

Q 18.: What will happen if deer is missing in the food chain given below?

             Grass →Deer→Tiger

(A) The population of tiger increases.

(B) The population of grass decreases.

(C) They will start eating grass.

(D) The population of tiger decreases and the population of grass increases.

Option – (d)

Q 19.: The decomposers in an ecosystem 

(A) Convert inorganic material into simpler forms

(B) Convert organic materials into inorganic forms

(C) Do not breakdown organic compounds

(D) Convert inorganic materials into organic compounds

Option – (b)

Q 20.: If a grasshopper is eaten by a frog, then the energy transfer will be from

(A) Producers to decomposers

(B) Producers to primary consumer

(C) Primary consumer to secondary consumer

(D) Secondary consumer to primary consumer

Option – (c)

Q 21.:  The decomposers in an ecosystem:

(A) Convert organic material to inorganic forms

(B) Convert inorganic material to simpler forms

(C) Convert inorganic material into organic compound

(D)  Do not break down organic compound

Option – (a)

Q 22.:  Some waste products are listed below:

  • Grass Cutting
  • Polythene Bag
  • Plastic Toys
  • Used Tea Bags
  • Old Clothes
  • Paper Straw                                                                                                     Which group of waste materials can be classified as non-biodegradable?

(A) Plant waste, used tea bags

(B) Polyethene bags, plastic toys 

(C) Used tea bags, paper straw

(D) Old clothes, broken footwear

Option – (b)

Q 23.:Which statement shows interaction of an abiotic component with a biotic component in an ecosystem?

(A)  A grasshopper feeding on a leaf. 

(B)  Rainwater running down into the lake.

(C) An earthworm making a burrow in the soil.

(D) A mouse fighting with another mouse for food.  

Option – (c)

Q 24.: Which of the following are environment-friendly practices?

(A)  Carrying a cloth-bag to put purchases in while shopping.

(B) Switching off unnecessary lights and fans.

(C) Walking to school instead of getting your mother to drop you on her scooter.

(D) All of the above.

Option – (d)

Q 25.:  The amount of energy that flows from one trophic level to another in a food chain is

(A) 5%

(B) 10%

(C) 20%

(D) 15%

Option – (b)

Q 26.: The manufacturing of Chlorofluorocarbons free refrigerators is mandatory throughout the world. How does this help prevent ozone depletion?

(A) This will help convert oxygen molecules into ozone.

(B) This will help convert the CFCs into ozone molecules.

(C) This will reduce the production of CFC from oxygen molecules.

(D) This will reduce the release of CFCs that reacts with ozone molecules

Option – (d)

Q 27.: Kitchen wastes can be hygienically disposed off through

(A) Dumping

(B) Composition

(C) Incineration

(D) Recycling

Option – (b)

Q 28.: Environment includes

(A)  Land, air, water

(B)  Light, temperature, rainfall

(C)  Plants, animals, microbes

(D) All of these

Option – (d)

Q 29.: Which of the following is a linear arrangement of organisms

(A) Food chain

(B) Food chain

(C) Trophic levels

(D) Community

Option – (a)

Q 30.: An agricultural cropland is

(A) A biome

(B)  A natural ecosystem

(C) An artificial ecosystem

(D) None of these 

Option – (c)

Q 31.: Problem of solid waste disposal can be reduced through…….

(A)  Recycling

(B) Lesser pollution

(C)  More timber

(D) Population control

Option – (a)

Q 32.:  An environment friendly practice is

(A)Using CFLs at homes and offices 

(B) Using car to go to nearby places

(C) Using AC in every room

(D) Burning plastics

Option – (a)

Q 33.: The cleaners of nature are

(A) Producers

(B)  Polluted air and water

(C) Deficient food supply

(D)  Decrease in energy at higher trophic levels

Option – (d)

Q 34.: Ozone hole may cause

(A)  Mutations

(B) Global warming

(C) Skin cancer

(D) All of these

Option – (d)

Q 35.: The harmful chemical which is accumulating in human beings through food chain is



(C) Abscisic acid


Option – (B)

Q 36.: Biodegradable wastes include

(A) Aluminium foils

(B) Glass bottles

(C)  Pesticides

(D) Wood shavings

Option – (D)

Q 37.:  What is the most expensive component of solid waste handling?

(A) Collection

(B) Storage


(D)  Separation

Option – (a)

Q 38.:  Which of the following statement regarding recycling is wrong?

(A) Saves precious resources

(B)  Require stable market

(C)  Improves efficiency of treatment processes

(D) Increases the needs for mining virgin materials

Option – (d)

Q 39.: In a given food chain the amount of energy at fourth trophic level is 5 KJ, what will be the energy at producer level ?

(A) 5KJ

(B) 50KJ

(C) 500KJ

(D) 5000KJ

Option – (d)

Q 40.:  Acid rain is caused due to _______.

(A) Carbon dioxide

(B) Nitrogen oxides

(C) Sulphur oxides

(D) Both (b) and (c)

Option – (d)


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We hope that these Chapter 15 Our Environment MCQs for Class 10 Science helped you in learning new concepts. All questions are based on NCERT syllabus and some of them have been asked in various competitive exams. You can go to the next pages to practice more for Chapter 15 Our Environment MCQs for Class 10 Science, click on the question range given above.

Also you can practice Class 10 Science MCQs (Multiple Choice Questions) for other chapters.