RBSE Class 10 Science Chapter Our Environment MCQs (Objectives) are very important for students preparing for Board Exams. These MCQS have been prepared on the basis of important topics of Our Environment.
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Class 10 Science Chapter Our Environment Objectives
In this post, you will find high- quality, exam oriented MCQs with answers prepared according to the latest RBSE Class 10 Science syllabus. You can solve these MCQs after reading Quick Revision Notes and also solve the questions of the chapter Our Environment.
Choose the correct answer of :
1.Biodegradable substance is
(a) glass bottle
(b) iron-nail
(c) paper cup
(d) none of above
Correct answer-
(c)
2.In a food chain ,suppose the amount of energy of
fourth trophic level is 4kJ, what will be the energy available at the producer level-
(a)4000kJ
(b)400kJ
(c)40kJ
(d)4kJ
Correct answer- (a)
3.The gaseous component over
earth surface comprises
(a) atmosphere
(b) hydrosphere
(c) lithosphere
(d) no sphere
Correct answer-
(a)
4.Ecosystem is a system
containing livings and non-livings in which
(a) non-livings affect the livings
(b) livings affect the non-livings
(c) livings and non-livings both effect each
other
(d) all the above
Correct answer-
(c)
5.Accumulation of
non-biodegradable pesticides in the food
chain in large amount at each trophic level is known as-
(a)Pollution
(b)Biomagnificaiton
(c)Accumulation
(d)None of above
Correct answer –(b)
6.The living components of a
biosphere are
(a) plants and animals
(b) plants only
(c) soil, water, air and minerals
(d) light, temperature, humidity and pressure
Correct answer-
(a)
7.The non-living components
of a biosphere are
(a) plants
(b) soil, water, air and
minerals
(c) animals
(d) light, temperature,
humidity and pressure
Correct answer-
(b)
8.In an ecosystem, the 10%
energy available for transfer from one trophic level to the next is in the form
of-
(a)Light energy
(b)Mechanical energy
(c)Chemical energy
(d)All above
Correct answer-(c)
9.The climate conditions are
(a) plants
(b) soil, water, air and
minerals
(c) animals
(d) light, temperature,
humidity and pressure
Correct answer-
(d)
10.The organisms that
decompose the dead bodies, are
(a) producers
(b) decomposers
(c) predators
(d) consumers
Correct answer-
(b)
11.The organisms that
prepare their own food, are
(a) producers
(b) decomposers
(c) predators
(d) consumers
Correct answer-
(a)
12.Flow of energy in an
ecosystem is always-
(a)In no specific direction
(b)Unidirectional
(c)In all directions
(d)Bidirectional
Correct answer-(b)
13.The organisms that use
the food prepared by others are
(a) producers
(b) decomposers
(c) predators
(d) consumers
Correct answer-
(d)
14.In a food chain, the
third trophic level is occupied by-
(a)Herbivores
(b)Carnivores
(c)Decomposers
(d)Producers
Correct answer –(b)
15.In the following groups
of materials which group /groups contain only non-biodegradable items-(i).
(i)Polythene,PVC, detergent
(ii)Plastic,grass, iron
(iii)DDT, plastic,wod
(iv)Grass, wood,paper
(a)(i)
(b)(ii)
(c)(i) and (ii)
(d)(vi)
Correct answer-(a)
16.Green plants are
(a) consumers
(b) decomposers
(c) autotrophs
(d) heterotrops
Correct answer-
(c)
17.Which one of the
following is an artificial ecosystem-
(a)Crop field
(b)Pond
(c)Forest
(d)dLake
Correct answer- (a)
18.Man is
(a) producer
(b) decomposers
(c) autotrophs
(d) heterotrops
Correct answer-
(d)
19.Which of the following
statement is incorrect
(a)Green plants get their
foods from organic compounds
(b)Green plants are
producers
(c)Green plants convert
solar energy into chemical energy
(d)Green plants prepare food
from inorganic compounds
Correct answer-(a)
20.The example of
herbivorous is
(a) snake
(b) lion
(c) tiger
(d) deer
Correct answer-
(d)
21.The example of
carnivorous is
(a) mouse
(b) rabbit
(c) hawk
(d) heterotrops
Correct answer-
(c)
22.Solar energy enters in a
food chain through
(a) autotrophs
(b) herbivores
(c) carnivores
(d) decomposers
Correct answer-
(a)
23.Only .......... % of
solar energy is trapped by green plants
(a) 10
(b) 5
(c) 2
(d) 1
Correct answer-
(d)
24.A food chain comprises
frog, snake, grass and grasshopper the organism at third trophic level is
(a) grass
(b) grasshopper
(c) frog
(d) snake
Correct answer-
(c)
25.A food chain comprising
birds, green plants, fish and man. The concentration of any harmful chemical
entering the food chain will be maximum, in
(a) fish
(b) birds
(c) green plants
(d) man
Correct answer-
(d)
26.Ozone is a/ an
(a) isotope of oxygen
(b) allotrope of oxygen
(c) isomer of oxygen
(d) all the above
Correct answer-
(b)
27.Ozone layer prevents the
entry of.......... into atmosphere
(a) infrared radiation
(b) visible
light
(c) ultraviolet radiation
(d) all the above
Correct answer-
(c)
28.Examples of artificial
ecosystems are
(a) ponds and lakes
(b) gardens and crop fields
(c) seas and oceans
(d) forest and grasslands
Correct answer-
(b)
29.A food chain always
starts from
(a) herbivores
(b) producers
(c) carnivores
(d) decomposers
Correct answer-
(b)
30.Only .......... % of
energy is available at each successive trophic level
(a) 10
(b) 5
(c) 2
(d) 1
Correct answer-
(a)
31.In a food chain, transfer of energy from one tropic level to
the next tropic level takes place in the form of
(a) mechanical energy
(b) heat energy
(c) chemical energy
(d) light energy
Correct answer-
(c)
32.Flow of energy in a food
chain is
(a) unidirectional
(b) bidirectional
(c) multi directional
(d) no definite direction
Correct answer-
(a)
33.Organisms of a higher
trophic level that feed on several organisms of lower trophic level form the
(a) food chain
(b) ecosystem
(c) ecological pyramid
(d) food web
Correct answer-
(d)
34.Which group of the
organisms cannot constitute a food chain
(a) grass, deer, tiger
(b) grass, snake, wolf
(c) hawk, plants, snake, insect, frog
(d) phytoplankton, snake,
frog, insects
Correct answer-
(b)
35.What will happen if deer
is missing in the food chain
Plants → deer →
tiger
(a) plants will decrease
(b) tiger will increase
(c) population of tigers will decrease and
population of plants will increase
(d) no
change will be
Correct answer-
(c)
36.If lion eats a deer, the
transfer of energy is from
(a) first trophic level to second trophic level
(b) second trophic level to
third trophic level
(c) third trophic level to fourth trophic level
(d) third trophic level to second trophic level
Correct answer-
(b)
37.Accumulation of
non-biodegradable pesticides in the food chain in increasing amount at each
higher trophic level is called
(a) accumulation
(b) biogeo chemical cycle
(c) biomagnification
(d) biosphere
Correct answer-
(c)
38.Depletion of ozone layer
is mainly due to
(a) pesticides
(b) use of fossil fuels
(c) chloro carbons
(d) chlorogluoro carbons
Correct answer-
(d)
39.Excessive exposure to
uv-rays can cause in human-beings
(a) skin cancer
(b) peptic alcer
(c) damage to immune system
(d) AIDS
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iii)
(d) (i),
(iii) and (iv)
Correct answer-
(d)
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