MCQs on Our Environment chapter of class 10 Science are provided here with answers. All these MCQs will help you acquaint with important concepts and topics to be prepared for the objective type questions to be asked in the Class 10 Science CBSE Exam.
MCQ Questions on Our Environment Class 10
1. Among the following choose the correct option which contains only biodegradable items?
i. Wood, paper, PVC
ii. Paper, seeds, detergent,
iii. Paper, animal excreta, wood
iv. Wool, leaves, paper
a. (i), (ii) and (iii)
b. (i) and (iii)
c. (ii), (iii) and (iv)
d. (iii) and (iv)
Answer: (iii) and (iv)
2. Which among the following statements is incorrect in view of the plants?
a. They convert the solar energy into mechanical energy
b. They prepare their food from organic compounds
c. They are also called producers
d. They are the initial source of energy in a food chain
Answer: They prepare their food from organic compounds
3. In a food chain the second trophic level is occupied by:
a. Carnivores
b. Autotrophs
c. Herbivores
d. Producers
Answer: Herbivores
4. Every food chain in the ecosystem begins with………. which are the original source of food.
a. Saprophytes
b. Parasites
c. Producers
d. Herbivores
Answer: Producers
5. We should reduce the use of the plastic bags, bottles etc. because:
a. They are not durable
b. They are non-biodegradable
c. They are made of toxic materials
d. They react with the atmospheric gases
Answer: They are non-biodegradable
6. Green plants utilize ……… percent of sun’s energy to prepare their food by the process of photosynthesis?
a. 1 percent
b. 10 percent
c. 20 percent
d. 99 percent
Answer: 1 percent
7. The process of accumulation of harmful chemical substances like pesticides, in the body of living organisms at each trophic level of a food chain is known as:
a. Biological magnification
b. Biological accumulation
c. Chemical magnification
d. Chemical accumulation
Answer: Biological magnification
8. Which of the following may be a conclusion of the excessive exposure of humans to sun’s ultraviolet rays?
i. Peptic ulcers
ii. Eye disease like cataract
iii. Damage to lungs
iv. Skin cancer
a. (i) and (iv)
b. (ii), (iii) and (iv)
c. (ii) and (iv)
d. Only (iv)
Answer: (ii) and (iv)
9. Which among the following is a correct full form for DDT?
a. Dichlorodiphenyltrichloroethane
b. Dichlorodiphenyltetrachloroethane
c. Dichlorodecaphenyltrichloroethane
d. Dichlorodiethyltrichloroethane
Answer: Dichlorodiphenyltrichloroethane
10. If 100 J energy is available at the producer level in a food chain then the energy available to the secondary consumer will be:
a. 10 J
b. 0.1 J
c. 1 J
d. 0.01 J
Answer: 1 J
11. 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. Tiger will start eating grass
d. The population of tiger decreases and the population of grass increases
Answer: The population of tiger decreases and the population of grass increases
12. Which of the following substances will not be converted to compost when added in a composting pit?
a. Waste paper
b. Fruit and vegetable peels
c. Human and animal excreta
d. Plastic bags
Answer: Plastic bags
13. Global warming is a phenomenon related to:
a. Evaporation
b. Ecological balance
c. Greenhouse effect
d. Desertification
Answer: Greenhouse effect
14. Which of the following radiations is responsible for the conversion of atmospheric oxygen to ozone?
a. Gamma radiations
b. Cosmic radiations
c. Infrared radiations
d. Ultraviolet radiations
Answer: Ultraviolet radiations
15. The substance which is chiefly responsible for the depletion of ozone layer is:
a. CFCs
b. CH4
c. DDT
d. O3
Answer: CFCs
Extra Questions on Our Environment Class 10
1. Resources which are directly derived from nature are referred to as
a. Organic resources
b. Natural resources
c. Man made resources
d. None of the above
Answer: Natural resources
2. Resources that take too long a period of time to be used as a resource are called as
a. Renewable resource
b. Non-renewable resource
c. Exhaustible resource
d. Inexhaustible resource
Answer: Inexhaustible resource
3. The fossil fuel that is derived from the dead remains of plants that grew some 250 million years ago is
a. Petroleum
b. Natural gas
c. Coal
d. LPG
Answer: Coal
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4. A resource that cannot be replaced in a reasonably short time is usually referred to as
a. Renewable
b. Non-renewable
c. Natural
d. Man made
Answer: Non-renewable
5. Man made resources are alternative to natural resources for a variety of reasons. Which of these would not be one of those?
a. They increase variety and choice
b. They are cheaper to produce than natural resources
c. They are made from renewable resources
d. They are better suited for the purpose for which they will be used
Answer: They are made from renewable resources
6. Which of these is not a fossil fuel?
a. Coal
b. Oil
c. Natural gas
d. Uranium
Answer: Uranium
7. A liquid fuel that was formed from the ancient remains of sea plants and animals is
a. Natural gas
b. Petroleum
c. Geothermal energy
d. Coal
Answer: Petroleum
8. Energy in the rays from the sun is called
a. Solar energy
b. Wind energy
c. Tidal energy
d. Water energy
Answer: Solar energy
9. Which is a list of renewable resources?
a. Petroleum, geothermal, wind
b. Biomass, geothermal, hydropower
c. Natural gas, wind, biomass
d. Hydropower, solar, wind energy
Answer: Hydropower, solar, wind energy
10. Energy from the heat inside the earth is
a Natural gas
b. Geothermal
c. Petroleum
d. Terrathermal
Answer: Geothermal
11. A coal deposit that is not economical to mine today would be considered part of our
a. Coal reserves
b. Coal resources
c. Coal reservoirs
d. None of these
Answer: Coal reserves
12. Which out of the following are the causes of soil erosion?
a. Unrestricted grazing
b. Over cultivation
c. Deforestation
d. All of the above
Answer: All of the above
13. The process of restoring forests that once existed but was removed at some time in the past is known as
a. Afforestation
b. Reforestation
c. Deforestation
d. None of these
Answer: Reforestation
14. Red data book contains data of
a. All plant species
b. All animal species
c. Threatened species
d. Economically important species
Answer: Threatened species
15. IUCN Headquarters is at
a. Morges, Switzerland
b. Paris, France
c. Vienna, Austria
d. New York, USA
Answer: Morges, Switzerland
16. Which of the following regions has the maximum diversity?
a. Mangroves
b. Temperate forest
c. Taiga
d. Coral reefs
Answer: Coral reefs
17. The most important reason for decrease in biodiversity is
a. Habitat pollution
b. Over exploitation
c. Habitat destruction
d. Introduction of exotic species
Answer: Habitat destruction
18. Dodo is
a. Endangered species
b. Rare species
c. Extinct species
d. Exotic species
Answer: Extinct species
19. Blue whale is placed under
a. Endangered
b. Rare
c. Extinct
d. Exotic
Answer: Endangered
20. Conservation within the natural habitat is
a. Ex-situ conservation
b. In-situ conservation
c. Ex-vivo conservation
d. In-vivo conservation
Answer: In-situ conservation
21. Which one of the following is not included under in situ conservation?
a. Zoo
b. National Park
c. Wild life Sanctuary
d. Biosphere Reserve
Answer: Zoo
22. Ex-situ conservation includes
a. Zoo
b. Botanical Garden
c. Germplasm Bank
d. All of the above
Answer: All of the above
23. Hotspots are regions of high
a. Rareism
b. Endemism
c. Diversity
d. Critically endangered population
Answer: Diversity
24. Endemic species are
a. Rare species
b. Species localized in a specific region
c. Cosmopolitan in distribution
d. None of these
Answer: Species localized in a specific region
25. Which one of the following has the maximum genetic diversity in India?
a. Tea
b. Teak
c. Mango
d. Wheat
Answer: Mango
26. Which one of the following regions in India is a hotspot of biodiversity?
a. Sundarbans
b. Western Ghats
c. Eastern Ghats
d. Gangetic plains
Answer: Western Ghats
27. Darwin’s finches are a good example of
a. Convergent evolution
b. Adaptive radiation
c. Connecting link
d. Industrial melanism
Answer: Adaptive radiation
28. Which group of vertebrates comprises of highest number of species
a. Mammals
b. Fishes
c. Reptiles
d. Birds
Answer: Fishes
29. 5th June is observed as
a. World environment day
b. World forest day
c. World population day
d. World wildlife day
Answer: World environment day
30. The unfavorable alteration of environment by human activities is termed as
a. Ecological disturbance
b. Ecological degradation
c. Pollution
d. Catastrophe
Answer: Ecological degradation
31. Biogas contains mainly
a. Carbon dioxide
b. Methane
c. Butane
d. Propane
Answer: Methane
32. Main source of acid rain is
a. Sulphur dioxide
b. Nitrogen
c. Carbon dioxide
d. Carbon monoxide
Answer: Sulphur dioxide
33. Treated water can be disinfected by adding
a. Alum
b. Fluorine
c. Chlorine
d. Oxygen
Answer: Chlorine
34. The burning of fossil fuels releases large amount of
a. Nitrogen
b. Sulphur
c. Carbon
d. Hydrogen
Answer: Sulphur
35. Which of the following does not causes air pollution when used for heating purposes
a. Coal
b. Petrol
c. Kerosene
d. Solar energy
Answer: Solar energy
36. pH of rainwater is
a. 5-6
b. 6-7
c. 7-8
d. 8-9
Answer: 5-6
37. A poisonous gas given out of vehicles exhaust is
a. Carbon monoxide
b. Ethane
c. Methane
d. Carbon dioxide
Answer: Carbon monoxide
38. A common bactericide used in swimming pools is
a. Chlorine
b. Alum
c. Borax
d. DDT
Answer: Chlorine
39. Green house effect is linked to
a. Nitrogen oxides
b. Sulphur dioxides
c. Carbon dioxides
d. Carbon monoxides
Answer: Carbon dioxides
40. Disposable glasses and plates are made up of
a. PVC
b. Polystyrene
c. Polyvinyl alcohol
d. Polypropylene
Answer: Polypropylene
41. Aerosols consisting of solid particles produced by combustion
a. Fog
b. Smog
c. Smoke
d. None of these
Answer: Smog
42. Which of the following are consequences of ozone depletion
a. Skin cancer and cataract
b. Reduced growth in plants
c. Shortening of zooplanktons and their breeding period
d. All of the above
Answer: Skin cancer and cataract
43. Which out of the following is a measure to control air pollution
a. Reduction in use of fossil fuels
b. Increasing use of renewable energy resources
c. Using catalytic convertors in vehicles
d. All of the above
Answer: All of the above
44. The discharge of warm/hot water directly into rivers is known as
a. Water pollution
b. Thermal pollution
c. Marine pollution
d. None of the above
Answer: Thermal pollution
45. Yellowing of Taj Mahal is an effect of
a. Acid rain
b. Global warming
c. Ozone depletion
d. All of the above
Answer: Acid rain
46. Identify the aftermaths of acid rain from the following
a. Dissolving and washing away of nutrients from the soil
b. Increasing the acidity of soils, thereby hindering the growth of plants
c. Damaging the building materials/ heritage sites
d. All of the above
Answer: All of the above
47. Increase in concentration of toxic level in each trophic level is referred to as
a. Eutrophication
b. Biomagnification
c. Bioaccumulation
d. Bioconcentration
Answer: Biomagnification
48. Pollutants that are easily manageable and decomposable in nature are called
a. Biodegradable pollutants
b. Non-biodegradable pollutants
c. Renewable pollutants
d. None of these
Answer: Biodegradable pollutants
49. The supersonic jets cause air pollution by the thinning of
a. Carbon dioxide layer
b. Sulphur dioxide layer
c. Ozone layer
d. Oxygen layer
Answer: Ozone layer
50. Which of the following is the best indicator of SO2 pollution
a. Bryophytes
b. Pteridophytes
c. Lichens
d. Algae
Answer: Lichens
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