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Our Environment Class 10 MCQs Questions with Answers
Question 1.
Which of the following groups contain only non-biodegradable items?
(a) Grass, flowers and leather
(b) Grass, wood and plastic
(c) Fruit-peels, cake and lime-juice
(d) Cake, wood and grass
Answer:
(b) Grass, wood and plastic
Question 2.
Which of the following constitute a food-chain?
(a) Grass, wheat and mango
(b) Grass, goat and human
(c) Goat, cow and elephant
(d) Grass, fish and goat
Answer:
(b) Grass, goat and human
Question 3.
Which of the following are environment-friendly practices?
(a) Carrying cloth-bags 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
Answer:
(d) All of the above
Question 4.
Ecosystem has two components:
(a) plants and animals
(b) weeds and trees
(c) biotic and abiotic
(d) birds and mammals
Answer:
(c) biotic and abiotic
Question 5.
Biotic component includes:
(a) producer, consumer and decomposer
(b) consumers only
(c) producers only
(d) decomposers only.
Answer:
(a) producer, consumer and decomposer
Question 6.
What is the best arrangement of an energy system consisting of hawks, mice, grasses and snakes:
(a) grass, hawks, mice, snakes
(b) grass, mice, snakes, hawks
(c) grass, snakes, mice, hawks
(d) grass, mice, hawks, snakes
Answer:
(b) grass, mice, snakes, hawks
Question 7.
Biosphere includes:
(a) hydrosphere only
(b) atmosphere only
(c) lithosphere only
(d) all these
Answer:
(d) all these
Question 8.
The primary source of energy in an ecosystem is:
(a) chlorophyll
(b) sunlight
(c) ATP
(d) leaves.
Answer:
(b) sunlight
Question 9.
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.
Answer:
(b) Green plants get their food from organic compounds
Question 10.
Depletion of ozone layer is mainly due to:
(a) Chlorofluorocarbon compounds
(b) Pollution
(c) Methane
(d) Pesticides
Answer:
(a) Chlorofluorocarbon compounds
Question 11.
In a food chain, the third tropic level is always occupied by:
(a) Carnivores
(b) Herbivores
(c) Decomposers
(d) Producers
Answer:
(a) Carnivores
Question 12.
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.
Answer:
(b) The population of grass decreases
Question 13.
The decomposers in an ecosystem:
(a) Convert organic material into simpler forms
(b) Convert organic materials into inorganic forms
(c) Convert inorganic materials into organic compounds
(d) Do not breakdown organic compounds.
Answer:
(b) Convert organic materials into inorganic forms
Question 14.
If a grasshopper is eaten by a frog, then the energy transfer will be from:
(a) Producer to decomposer
(b) Producer to primary consumer
(c) Primary consumer to secondary consumer
(d) Secondary consumer to primary consumer.
Answer:
(c) Primary consumer to secondary consumer
Question 15.
In natural ecosystem decomposers include:
(a) Only microscopic animals
(b) Only bacteria and fungi
(c) Herbivores and carnivores
(d) Both (a) and (b)
Answer:
(d) Both (a) and (b)
Question 16.
These are present at maximum number in an ecosystem:
(a) Producers
(b) Consumers of first level
(c) Decomposers
(d) Consumers of second level
Answer:
(a) Producers
Question 17.
Energy flow from one trophic level to another in an ecosystem is:
(a) 5%
(b) 10%
(c) 15%
(d) 20%
Answer:
(b) 10%
Question 18.
Trophic levels are formed by:
(a) Organisms linked in food chain
(b) Only plants
(c) Only animals
(d) Only carnivores
Answer:
(a) Organisms linked in food chain
Question 19.
The second trophic level is always of:
(a) Herbivores
(b) Autotrophs
(c) Carnivores
(d) Producers.
Answer:
(a) Herbivores
Question 20.
An agriculture/cropland is:
(a) A biome
(b) Natural ecosystem
(c) An artificial ecosystem
(d) A community of plants and animals only
Answer:
(c) An artificial ecosystem
Question 21.
In a food chain, energy flow is:
(a) Unidirectional
(b) Bidirectional
(c) Multidirectional
(d) No definite pattern.
Answer:
(a) Unidirectional
Question 22.
A pond ecosystem is:
(a) Natural
(b) Hydrological
(c) Artificial
(d) Abiotic.
Answer:
(a) Natural
Question 23.
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.
Answer:
(a) Decrease in energy at higher trophic level
Question 24.
Increasing accumulation of DDT in higher trophic level of a good chain is:
(a) Biotic potential
(b) Biotic influence
(c) Biomagnification
(d) Bioconcentration.
Answer:
(c) Biomagnification
Question 25.
This is biodegradable:
(a) DDT
(b) Cow-dung
(c) Polythene
(d) Plastic.
Answer:
(b) Cow-dung
Question 26.
Driving force of an ecosystem is:
(a) Carbohydrates
(b) Biomass
(c) ATP
(d) Solar energy
Answer:
(d) Solar energy
Question 27.
An ecosystem includes:
(a) All living organisms
(b) Nonliving organisms
(c) Both living organisms and nonliving objects
(d) Sometimes living organisms and sometimes nonliving organisms
Answer:
(c) Both living organisms and nonliving objects
Question 28.
This is an artificial ecosystem:
(a) Pond
(b) Crop field
(c) Lake
(d) Forest.
Answer:
(b) Crop field
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