Class 10 Biology



Environment

Exemplar Problems MCQ I

Which one of the following is an artificial ecosystem?

  • Pond
  • Crop field
  • Lake
  • Forest

    Answer: (b) Crop field

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

  • Carnivores
  • Herbivores
  • Decomposers
  • Producers

    Answer: (a) Carnivores

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

  • Carnivores
  • Herbivores
  • Decomposers
  • Producers

    Answer: (a) Carnivores

An ecosystem includes

  • All living organisms
  • Non-living objects
  • Both living organisms and non-living objects
  • Sometimes living organisms and sometimes non-living objects

    Answer: (c) Both living organisms and non-living objects

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 ↠ Grasshopper ↠ Frog ↠ Snake ↠ Hawk

  • 5 k J
  • 50 k J
  • 500 k J
  • 5000 k J

    Answer: (d) 5000 kJ

Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as

  • Eutrophication
  • Pollution
  • Biomagnification
  • Accumulation

    Answer: (c) Biomagnification

Depletion of ozone is mainly due to

  • Chlorofluorocarbon compounds
  • Carbon monoxide
  • Methane
  • Pesticides

    Answer: (a) Chlorofluorocarbon compounds

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

  • Decomposers
  • Producers
  • Herbivores
  • Carnivores

    Answer: (b) Producers

In an ecosystem, the 10% of energy available for transfer from one trophic level to the next is in the form of

  • Heat energy
  • Light energy
  • Chemical energy
  • Mechanical energy

    Answer: (c) Chemical energy

Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the

  • Food web
  • Ecological pyramid
  • Ecosystem
  • Food chain

    Answer: (b) Ecological pyramid

Flow of energy in an ecosystem is always

  • Unidirectional
  • Bidirectional
  • Multi directional
  • No specific direction

    Answer: (a) Unidirectional