Class 10 Our Environment CBSE Questions & Answers

Class 10 · Our Environment

Class 10 Our Environment CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
In an ecosystem, the \({\rm{1}}0\% \) of energy available for transfer from one trophic level to the next trophic level is in the form of-
  • A
    Mechanical energy.
  • B
    Heat energy
  • C
    Light energy
  • D
    Chemical energy
    Correct
2
Disposable plastic plates should not be used because-
  • A
    They are made of toxic materials.
  • B
    They are made of biodegradable materials.
  • C
    They are made of non-biodegradable
    Correct
  • D
    They are made of materials with light weight
3
What will happen if deer is missing in the given food chain?, Grass \( \to \) Deer \( \to \) Tiger.
  • A
    The population of tiger increases.
  • B
    The population of tiger decreases and the population of grass increases
    Correct
  • C
    Tiger will start eating grass.
  • D
    The population of grass decreases
4
The ecosystem of earth is known as-
  • A
    Biome
  • B
    Association.
  • C
    Biosphere
    Correct
  • D
    Community
5
Secondary treatment in sewage treatment plant involves-
  • A
    Physical treatment like sedimentation, till ration
  • B
    Biological treatment
    Correct
  • C
    Passing ultraviolet radiations.
  • D
    Chemical treatment
6
Exposure to ultraviolet radiation causes eye disease like-
  • A
    Short sightedness.
  • B
    Conjunctivitis
  • C
    Cataract
    Correct
  • D
    Colour blindness
7
Pollution caused by garbage can be controlled by-
  • A
    Recycling of plastic and paper
  • B
    Use of biodegradable products
  • C
    All of the above.
    Correct
  • D
    Producing biogas from the organic wastes
8
Plant, snake, insect, frog, hawk, deer. , Which of the above organisms belong to the same trophic level.
  • A
    Hawk and frog
  • B
    Hawk and deer.
  • C
    Frog and snake
    Correct
  • D
    Snake and insect
9
For management of wastes, we should follow-
  • A
    3 Q’S
  • B
    3 A’S
  • C
    3 R’S
    Correct
  • D
    3 P’S
10
If a grasshopper is eaten by a frog, then the energy transfer will be from-
  • A
    Producer to primary consumer
  • B
    Secondary consumer to primary consumer.
  • C
    Producer to decomposer
  • D
    Primary consumer to secondary consumer.
    Correct
11
An agriculture / cropland is-
  • A
    An artificial ecosystem
    Correct
  • B
    A natural ecosystem
  • C
    A biome
  • D
    A community of plants & animals only
12
Ozone layer is mainly damaged by-
  • A
    CFCS
    Correct
  • B
    Sulphur dioxide
  • C
    Methane
  • D
    Carbon-dioxide
13
The number of trophic levels in a food chain are-
  • A
    three to four
  • B
    unlimited
  • C
    four to five
    Correct
  • D
    2 to 3
14
Flow of energy in an ecosystem is always-
  • A
    No specific direction
  • B
    Unidirectional
    Correct
  • C
    Multidirectional
  • D
    Bidirectional
15
Accumulation of non-biodegradable pesticides in the food chains is increasing amount at each higher trophic level is known as-
  • A
    Accumulation
  • B
    Biomagnifications
    Correct
  • C
    Eutrophication
  • D
    Pollution