10th Standard CBSE - Science - Our Environment

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Question - 1

Which of the following groups contain only  biodegradable items?

  • A Grass, flowers and leather
  • B Grass, wood and plastic
  • C Fruit-peels, cake and lime-juice
  • D Cake, wood and grass

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

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

Question - 4

Which one of the following is an artificial ecosystem?

  • A Pond
  • B Crop field
  • C Lake
  • D Forest

Question - 5

In a food chain, the third trophic level is always occupied by

  • A Carnivores
  • B Herbivores
  • C Decomposers
  • D Producers

Question - 6

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

Question - 7

In the given food chain, suppose the amount of energy at fourth trophic level is 5 kJ, what will be the energy available at the producer level?
Grass\(\longrightarrow\)Grasshopper\(\longrightarrow\)Frog\(\longrightarrow\)Snake\(\longrightarrow\)Hawk

  • A 5 kJ
  • B 50 kJ
  • C 500 kJ
  • D 5000 kJ

Question - 8

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 Bio magnification
  • D Accumulation

Question - 9

Depletion of ozone is mainly due to

  • A Chlorofluorocarbon compounds
  • B Carbon monoxide
  • C Methane
  • D Pesticides

Question - 10

Organisms which synthesize carbohydrates from inorganic compounds using radiant energy are called

  • A Decomposers
  • B Producers
  • C Herbivors
  • D Carnivores
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