Students of class 10 Science should refer to MCQ Questions Class 10 Science Our Environment with answers provided here which is an important chapter in Class 10 Science NCERT textbook. These MCQ for Class 10 Science with Answers have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 10 Science. The following MCQs can help you to practice and get better marks in the upcoming class 10 Science examination

Chapter 15 Our Environment MCQ with Answers Class 10 Science

MCQ Questions Class 10 Science Our Environment provided below have been prepared by expert teachers of grade 10. These objective questions with solutions are expected to come in the upcoming Standard 10 examinations. Learn the below provided MCQ questions to get better marks in examinations.

Question. 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

Question. The cleaners of nature are   
a) Producers
b) Consumers
c) Herbivores
d) Decomposers

Question. 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

Question. 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.

Question. In a food chain third trophic level is always occupied by   
a) Carnivores
b) Herbivores
c) Producers
d) Decomposers

Question. Biodegradable wastes include 
a) Aluminium foils
b) Glass bottles
c) Pesticides
d) Wood shavings

Question. 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.

Question. The primary consumers are   
a) Carnivores  
b) Herbivores
c) Omnivores
d) Producers

Question. The biotic components of an ecosystem consist of   
a) Plants and animals
b) Algae and fungi
c) Producers, consumers & decomposers
d) Air, water, soil

Question. Ozone forms by combination of free oxygen atoms and oxygen molecules. How do free oxygen atoms form at higher levels of atmosphere?   
a) by splitting of molecular oxygen into free oxygen atoms in the presence of low energy UV radiations
b) by splitting of a molecular oxygen into free oxygen atoms in presence of high energy UV radiations
c) by the combination of two molecular oxygen in the presence of high energy UV radiations
d) by the combination of two free oxygen atoms in the presence of lower energy UV radiations

Question. The driving force of any ecosystem is 
a) Carbohydrates
b) Solar energy
c) Biomass
d) ATP

Question. Which of the following constitutes a food chain   
a) Grass, goat and human
b) Goat, crow and elephant
c) Grass, fish and zebra
d) Grass, wheat and apple

Question. Kitchen wastes can be hygienically disposed off through   
a) Dumping
b) Composting
c) Incineration
d) Recycling

Question. 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

Question. Ozone hole may cause   
a) Mutations 
b) Global warming
c) Skin cancer
d) All of these

Question. 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 %

Question. Which of the following limits the number of trophic levels in a food chain   
a) Water
b) Polluted air and water
c) Deficient food supply
d) Decrease in energy at higher trophic levels

Question. Which of the following is responsible for the depletion of ozone layer   
a) CFCs
b) oxygen
c) SO₂
d) CO₂

Question. Environment includes 
a) Land, air, water
b) Light, temperature, rainfall
c) Plants, animals, microbes
d) All of these

Question. Which of the following could be incinerated   
a) Paper
b) Medicine bottles
c) Needle of syringe
d) All of these

Question. Which of the following is a linear arrangement of organisms   
a) Food chain
b) Food web
c) Trophic levels
d) Community

Question. What are the methods in which energy can be recovered from Waste to energy
(1) Heat
(2) Electricity
(3) Co-generation
a) By (1) and (2)
b) By (2) and (3)
c) By (1), (2) and (3)
d) None of the above

Question. What is the order of the waste management hierarchy, from most to least favoured   
a) Prevention- Recycle-Reuse- Disposal
b) Prevention-Reuse-Disposal-Recycle
c) Prevention-Disposal -Reuse-Recycle
d) Prevention-Reuse-Recycle-Disposal

Question. Problem of solid waste disposal can be reduced through…….   
a) Recycling
b) Lesser pollution
c) More timber
d) Population control

Question. The harmful chemical which is accumulating in human beings through food chain is   
a) BHC
b) DDT
c) Abscisic acid
d) CFC

Question. 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

Question. What is the most expensive component of solid waste handling?   
a) Collection
b) Storage
c) Treatment
d) Separation

Question. An agricultural cropland is   
a) A biome
b) A natural ecosystem
c) An artificial ecosystem
d) None of these

Question. Carnivores represent   
a) Primary consumers
b) Reducers
c) Phytoplanktons
d) Secondary and tertiary consumers

Question. 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

Question. In the given food chain, suppose the amount of energy at the fourth trophic level is 5 kJ, what will be the energy available at the producer level?
Grass → Grasshopper → Frog → Snake → Hawk
(a) 5 kJ
(b) 50 kJ
(c) 500 kJ
(d) 5000 kJ

Question. In the following groups of materials, which group(s) contain(s) only non-biodegradable items?
(i) Wood, paper, leather
(ii) Polythene, detergent, PVC
(iii) Plastic, detergent, grass
(iv) Plastic, Bakelite, DDT
(a) (i)
(b) (ii)
(c) (i) and (ii)
(d) (ii) and (iv)

Question. It was found that water from a river was contaminated with Coliform bacteria. Which one of the following pollutant might have got mixed with the water?
(a) fertilizer run off
(b) Industrial waste
(c) Pesticides
(d) Human faecal matter

Question. The 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) bio-magnification
(d) accumulation

Question. Food web is constituted by:
(a) relationship between the organisms and the environment
(b) relationship between plants and animals
(c) various interlinked food chains in an ecosystem
(d) relationship between animals and environment 

Question. Disposable plastic plates should not be used because:
(a) 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 

Question. Which of the follwoing are environment friendly practices?
(a) Carrying cloth-bags to put purchases in while shopping.
(b) Switching off unncessary lights and fans.
(c) Walking to school instead of getting your mother to drop you on her scooter.
(d) All of the above.

Question. 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

Question. Choose the incorrect statement from the following:
(a) Ozone is a molecule formed by three atoms of oxygen.
(b) Ozone shields the surface of the Earth from ultraviolet radiations.
(c) Ozone is deadly poisonous
(d) Ozone gets decomposed by UV radiations

Question. 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

Question. Which one of the following is an artificial ecosystem?
(a) Pond
(b) Crop field
(c) Lake
(d) Forest 

Fill in the Blanks

Question: The hierarchies within a food web are called ……….. levels.   trophic 108. Climate refers to the prevailing …………… conditions. 

Question: The total amount of ……………. ……………. per unit time produced in an ecosystem is called the gross primary productivity.   

Question: Without the …………….. in a food web many chemicals would not be recycled.   

Question: The use of chemicals like CFCs has endangered the ………. layer. 

Question: Decrease in ozone in stratosphere is linked to release of synthetic chemicals like ……………………..   

Question: The ……….. make the energy from sunlight available to the rest of the ecosystem.  

Question: The waste we generate may be …………….. or ……………… 

Question: The decomposers comprising micro-organisms like ……………….. and …………………     

Question: The energy flows from ……………….. to the heterotrophs and decomposers.   

Question: Gardens and crop fields are example of ……………….. ecosystem.   

Question:. The plants trap ……………….. energy and convert it into ……………….. Energy. 

Question: The interlocking pattern of various food chains is referred as ……………….. .   

Question: All the interacting organisms in an area together with the non-living constituents of the environment form an ……………….. .  

Question: The disposal of the waste we generate is causing serious ………………..problems.   

Question: Nitrates and nitrites present in the soil are changed into ………………..by micro-organisms. 

Question: The flow of energy is always ……………….. in food chains.    

Question: All the ecosystems taken together in a geographical area form a bigger unit known as ……………….. .   

Question: The energy available at each successive trophic level is ………………..of the previous level.  

Question: The various populations of living organisms in an area together form ……………….. community.  

Question: Nitrogen-fixing bacteria live in nodules on the roots of ……………….. plants.   

Question: Hydrosphere, lithosphere and atmosphere along with living organism form ……………….. .  

Question: The increased nitrogen in rivers and lakes boosts the growth of ……………….. and other phytoplankton at the cost of other aquatic organisms.  

We hope the above multiple choice questions for Class 10 Science for Chapter 15 Our Environment provided above with answers based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS are really useful for you. Our Environment is an important chapter in Class 10 as it provides very strong understanding about this topic. Students should go through the answers provided for the MCQs after they have themselves solved the questions. All MCQs have been provided with four options for the students to solve. These questions are really useful for benefit of class 10 students. Please go through these and let us know if you have any feedback in the comments section.