Our Environment
Class 10th Science Chapter MCQs
Our Environment Class 10 MCQs Questions
1.
Which of the following is biodegradable waste?
(a) DDT
(b) Aluminium can
(c) Plastic bag
(d) Cow dung
Answer
Answer: (d) Cow dung
2.
Which of the two sets belong to the same trophic level?
(a)
Rabbit: Tiger
(b) Vulture : Rat
(c) Grasshopper : Hawk
(d) Frog :
Lizard
Answer
Answer: (d) Frog : Lizard
3.
In a given food chain if the amount of energy at the fourth
trophic level is 6 kJ, what will be the energy available at the producer
level?
(a) 6000 kJ
(b) 20 kJ
(c) 60 kJ
(d) 600
kJ
Answer
Answer: (a) 6000 kJ
4. Which of the following is
biodegradable?
(a) Plastic mugs
(b) Leather belts
(c) Silver foil
(d) Iron nails
Answer
Answer: b
4. Which of the following is non-
biodegradable?
(a) Wool
(b) Nylon
(c) Animal bones
(d) Tea
leaves
Answer
Answer: b
6. Which one of the following will undergo fastest bio-degradation?
(a)
Mango seed
(b) Wood
(c) Mango peel
(d) Mango
pulp
Answer
Answer: d
7. In an ecosystem, herbivores
represent
(a) producers
(b) primary consumers
(c) secondary
consumers
(d) decomposers
Answer
Answer: b
8. Trophic level in an ecosystem
represents
(a) oxygen level
(b) water level
(c) energy level
(d)
salt level
Answer
Answer: c
9. A food chain comprising birds, green plants, fish and man.
The
concentration of harmful chemical entering the food chain will be maximum in
(a) green plants
(b) man
(c) birds
(d) fish
Answer
Answer: b
10. First link in any food chain is usually green plants because
(a) they
are widely distributed
(b) they are fixed at one place in the soil
(c)
they alone have the capacity to synthesise food using sunlight
(d) there are
more herbivores than carnivores
Answer
Answer: c
11. Which of the following statements about
food chain and energy flow through ecosystem is false?
(a) Food webs include
two or more food chains.
(b) All organisms that are not producers are
consumers.
(c) A single organism can feed at several trophic levels.
(d)
Detritivores feed at all trophic levels except the producer level.
(e) The
lower the trophic level at which an organism feeds, the more energy
available.
Answer
Answer: d
12. Which of the following is a logical sequence of food chain
(a)
producer → consumer → decomposer
(b) producer → decomposer → consumer
(c)
consumer → producer → decomposer
(d) decomposerproducer →
consumer
Answer
Answer: a
13. Which of the following is an
autotroph?
(a) Lion
(b) Insect
(c) Tree
(d)
Mushroom
Answer
Answer: c
14. In the garden ecosystem, which of the following are producers?
(a)
Insects
(b) Snakes
(c) Grasses
(d) Rabbits
Answer
Answer: c
13. Which one of the
following is an artificial ecosystem? [NCERT Exemplar Problems]
(a) Pond
(b) Crop field
(c) Lake
(d) Forest
Answer
Answer: b
16. An ecosystem includes
(a) all living
organisms
(b) non-living objects
(c) both living organisms and non-living
objects
(d) sometimes living organisms and sometimes nonliving
objects
Answer
Answer: c
17. Excessive exposure of humans to UV-ray s results in [NCERT Exemplar
Problems]
(i) damage to immune system
(ii) damage to lungs
(iii) skin
cancer
(iv) peptic ulcer
(a) (i) and (ii)
(b) (ii) and (iv)
(c) (i)
and (iii)
(d) (iii) and (iv)
Answer
Answer: c
18. Which group of organisms are not
constituents of a food chain? [NCERT Exemplar Problems]
(a) Grass, lion,
rabbit
(b) Plankton, man, fish, grasshopper
(c) Wolf, grass, snake,
tiger
(d) Frog, snake, eagle, grass, grasshopper
Answer
Answer: c
19. If a grasshopper is eaten by a frog, then the energy transfer will be
from [NCERT Exemplar Problems]
(a) producer to decomposer
(b) producer to
primary consumer
(c) primary consumer to secondary consumer
(d) secondary
consumer to primary consumer
Answer
Answer: c
20. Excessive exposure to ultraviolet radiation causes
(a) inflammation of
liver
(b) cancer of skin
(c) damage to the lungs
(d)
jaundice
Answer
Answer: b
21. Which one of the following is an artificial ecosystem?
(a) Lake
(b)
Forest
(c) Pond
(d) Crop field
Answer
Answer: d
22. Acid rain is caused by the oxides of
(a) carbon
(b) nitrogen
only
(c) sulphur only
(d) sulphur and
nitrogen
Answer
Answer: d
23. Which of the following is biodegradable?
(a) Aluminium can
(b)
Polythene bag
(c) Cowdung
(d) DDT
Answer
Answer: c
24. Which of the following is an abiotic component of an ecosystem?
(a)
Humus
(b) Bacteria
(c) Plants
(d)
Fungi
Answer
Answer: a
25. Which one of the following pairs belong to the category of primary
consumers?
(a) Eagle and snake
(b) Grasshoppers & cattle
(c) Snake
and frog
(d) Water beetles & fish
Answer
Answer: b
26. Which of the following chemicals causes depletion of the ozone layer?
(a) Carbon tetrachloride
(b) Methane
(c) Chloro fluoro carbon
(d)
Carbon monoxide
Answer
Answer: c
27. In a food chain, the third trophic level is always occupied by
(a)
herbivore
(b) carnivore
(c) decomposer
(d)
producer
Answer
Answer: b
28. The depletion of the ozone layer causes
(a) global wanning
(b)
earthquakes
(c) increased UV radiations
(d) acid
rain
Answer
Answer: c
29. In the given foodchain if the amount of energy at the fourth trophic
level is 4 kJ, what will be the energy available at the producer level?
Grass
→ Grasshopper → Frog → Snake
(a) 4 kJ
(b) 40 kJ
(c) 400 kJ
(d) 4000
kJ
Answer
Answer: d
30. What will happen if all the deer are killed in the given food chain?
Grass → Deer → Lion
(a) The population of grass decreases.
(b) The
population of lions increases.
(c) The population of lions remains
unchanged.
(d) The population of lions decreases and grass
increases.
Answer
Answer: d
31. Which of the two in the following sets belong to the same trophic
level?
(a) Grass; Grasshopper
(b) Goat; Spider
(c) Hawk ; Rat
(d)
Frog ; Lizard
Answer
Answer: d
32.
Which of the following is the best way for disposal of
vegetable and fruit peels?
(a) Landfill
(b) Recycling
(c)
Composting
(d) Burning
Answer
Answer: (c) Composting
33.
The problem caused due to ozone hole is
(a) earthquakes
(b) damage due to UV radiations
(c) chemical pollution
(d) acid
rain
Answer
Answer: (b) damage due to UV radiations
34.
An ecosystem includes
(a) all living organisms
(b)
non-living objects
(c) both living organisms and non-living objects
(d)
sometimes living organisms and sometimes non-living
objects
Answer
Answer: (c) both living organisms and non-living objects
35.
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) biomagnification
(d)
accumulation
Answer
Answer: (c) biomagnification
36.
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
Answer
Answer: (c) chemical energy
37.
Organisms which synthesise carbohydrates from inorganic
compounds using radiant energy are called
(a) decomposers
(b)
producers
(c) herbivores
(d) carnivores
Answer
Answer: (b) producers
38.
Excessive exposure of humans to UV-rays results in
(i)
damage to immune system
(ii) damage to lungs
(iii) skin cancer
(iv)
peptic ulcers
(a) (i) and (ii)
(b) (ii) and (iv)
(c) (i) and (iii)
(d) (iii) and (iv)
Answer
Answer: (c) (i) and (iii)
39.
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
Answer
Answer: (a) food web
40.
In the given Figure the various trophic levels are shown in a
pyramid. At which trophic level is maximum energy available?
(a) T4
(b) T2
(c) T1
(d)
T3
Answer
Answer: (c) T1
41.
Which group of organisms are not the constituents of a food
chain?
(i) Grass, lion, rabbit, wolf
(ii) Plankton, man, fish,
grasshopper
(iii) Wolf, grass, snake, tiger
(iv) Frog, snake, eagle,
grass, grasshopper
(a) (i) and (iii)
(b) (iii) and (iv)
(c) (ii) and
(iii)
(d) (i) and (iv)
Answer
Answer: (c) (ii) and (iii)
42.
The percentage of solar radiation absorbed by all the green
plants for the process of photosynthesis is about
(a) 1%
(b) 5%
(c)
8%
(d) 10%
Answer
Answer: (a) 1%
43.
Which of the statements is incorrect?
(а) 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
Answer: (b) Green plants get their food from organic compounds
44.
The decomposers in an ecosystem
(a) convert inorganic
material, to simpler forms
(b) convert organic material to inorganic
forms
(c) convert inorganic materials into organic compounds
(d) do not
breakdown organic compounds
Answer
Answer: (b) convert organic material to inorganic forms
45.
Disposable plastic plates should not be used because
(а)
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
Answer
Answer: (d) they are made of non-biodegradable materials
46.
What will happen if deer is missing in the food chain given
below?
Grass → Deer → Tiger
(а) 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
Answer: (d) The population of tiger decreases and the population of grass increases
47.
When is the world environment day celebrated?
(a) 16
June
(b) 5 December
(c) 5 June
(d) 5 July
Answer
Answer: (c) 5 June
48.
Which of these is a greenhouse gas?
(a) Hydrogen
sulphide
(b) Methane
(c) Ozone
(d) Carbon
monoxide
Answer
Answer: (b) Methane
49.
The transfer of energy in a food chain is always:
(a)
Unidirectional
(b) Methane
(c) Bi-directional
(d)
Random
Answer
Answer: (a) Unidirectional
50.
Which of these organisms are the most important decomposers
in an ecosystem?
(a) Algae and fungi
(b) Fungi and bacteria
(c) Algae
and bacteria
(d) Bacteria and virus
Answer
Answer: (b) Fungi and bacteria
51.
Which of these does not belong to biotic component?
(a)
Parasites
(b) Fungi
(c) Bacteria
(d) Soil
Answer
Answer: (d) Soil