CBSE Class 10 Biology Our Environment MCQs Set E

Question: In the given food chain, suppose the amount of energy at fourth trophic level is 2 kJ, what will be the energy available at the producer level?
a) 2 kJ
b) 20 kJ
c) 200 kJ
d) 2000 kJ
Answer: d

Question: Pyramid of energy in a forest ecosystem is
a) Always inverted
b) Always upright
c) Both upright and inverted
d) First upright then inverted
Answer: b

Question: Identify the biotic factors of an ecosystem from the following
a) Temperature, rainfall, soil
b) Plants, animals and microorganisms
c) Temperature, microbes and rainfall
d) Plants, animals and soil
Answer: b

Question: Non-biodegradable wastes can be disposed by
a) Decomposition
b) Throwing into water bodies
c) Buried under the soil
d) Incineration
Answer: d

Question: The importance of ecosystem lies in
a) Flow of energy
b) Cycling of materials
c) Both of the above
d) None of the above
Answer: c

Question: One organism may be the food for many organisms will constitute the
a) Food chain
b) Food web
c) Food pyramid
d) Food trophic level
Answer: b

Question: Ecosystem term was coined by
a) Odum
b) Mishra
c) Reiter
d) Tansley
Answer: d

Question: Food chain in an ecosystem is always
a) Bi-directional
b) Uni-directional
c) Multi-directional
d) No specific direction
Answer: b

Question: The element which is highly responsible for destruction of ozone molecule is
a) Fluorine
b) Chlorine
c) Methane
d) Carbon
Answer: b

Question: In other to maintain proper ecological balance
a) The existing forests should be cleared and new ones should be planted
b) Some quick-growing annuals should be planted if a tree must be cut
c) Trees must be cut whenever necessary because underground parts are useful
d) A tree should be planted in place of one to be cut
Answer: d

Question: In which of the following trophic levels in any ecosystem the maximum energy is stored?
a) Producers
b) Herbivores
c) Carnivores
d) Top carnivores
Answer: a

Question: In an ecosystem, 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

Question: Minamata is a disease caused due to
a) Land pollution
b) Air pollution
c) Bio magnification
d) Water pollution
Answer: c

Question: A biosphere is composed of
a) Living organisms
b) Living organisms and lithosphere
c) Living organisms, lithosphere and atmosphere
d) Living organisms, lithosphere, atmosphere and hydrosphere
Answer: d

Question: Which group of organisms constitute food chain
a) Grass, deer, lion, wolf
b) Plankton, grasshopper, fish, man
c) Grass, snake, tiger, wolf
d) Grass, grasshopper, tiger, wolf
Answer: a

Question: Vultures in an ecosystem are
a) Predators
b) Scavengers
c) Consumers
d) Top carnivores
Answer: b

Question: In a food chain, the first trophic level is always occupied by
a) Carnivores
b) Detritivores
c) Herbivores
d) Producers
Answer: d

Question: Pyramids of biomass are
a) Upright or inverted
b) Always inverted
c) Mostly upright
d) Mostly inverted
Answer: a

Question: In an ecosystem the function of the producers is to
a) Convert organic compounds into inorganic compounds
b) Trap solar energy and convert it into chemical energy
c) Utilize chemical energy
d) Release energy
Answer: b

Question: In an ecosystem
a) Primary producers are more than primary consumers
b) Secondary consumers are largest because they are powerful
c) Primary consumers are outnumbered
d) Primary consumers are least dependent on producers
Answer: a

Question: The accumulation of chemicals at various trophic levels in a food chain is known as
a) Chemical magnification
b) Physical magnification
c) Bio magnification
d) Eutrophication
Answer: c

Question: The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is
a) 10%
b) 100%
c) 9%
d) 1%
Answer: d

Question: In the given food chain, suppose the amount of energy at fourth trophic level is 2 kJ, what will be the energy available at the producer level?
a) 2 kJ
b) 20 kJ
c) 200 kJ
d) 2000 kJ
Answer: d

Question: Food chain in an ecosystem is always
a) Bi-directional
b) Uni-directional
c) Multi-directional
d) No specific direction
Answer: b

Question: The limitation of number of trophic levels in a food chain is due to
a) Sufficient food supply
b) Decrease in energy level at higher trophic level
c) Increase in energy level at higher trophic level
d) Supply of water
Answer: b

Question: The chemical which is mainly responsible for the depletion of ozone layer
a) AFC
b) H₂S
c) CFC
d) CCl₄
Answer: c

Question: Which group of organisms constitute a food chain
a) Grass, deer, lion, wolf
b) Plankton, grasshopper, fish, man
c) Grass, snake, tiger, wolf
d) Grass, grasshopper, tiger, wolf
Answer: a

Question: What will happen if frog is missing in the food chain given below?
Grass → Grasshopper → Frog → Snake
a) Population of grass increases and grasshopper decreases
b) Population of snake increases and grasshopper decreases
c) Population of grasshopper increases and population of snake decreases
d) Population of grasshopper decreases and snake increases
Answer: c

In the following question, a statement of Assertion (A) is followed by a statement of Reason (R). Answer these questions by selecting appropriate option given below:
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)
(c) Assertion (A) is true but Reason (R) is false.
(d) Assertion (A) is false but Reason (R) is true.

Question:
Assertion (A): Herbivores are called first order consumers.
Reason (R): Tiger is a top carnivore.
Answer: b

Question:
Assertion (A): Ecology is study of relationship between living organisms and their environment.
Reason (R): The biotic community and nonliving environment of an area function together to form an ecosystem.
Answer: a

Question:
Assertion (A): A network of food chains existing together in an ecosystem is known as food web.
Reason (R): An animal like kite cannot be a part of a food web.
Answer: c

Question:
Assertion (A): Decomposers keep the environment clean.
Reason (R): They recycle matter by breaking down the organic remains and waste products of plants and animals.
Answer: a

Question:
Assertion (A): Animals adopt different strategies to survive in hostile environment.
Reason (R): Praying mantis is green in colour which merges with plant foliage.
Answer: a