Olympiad – Class VII – Science - Bio - Resources on Earth - Forests and Ecosystems

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Question - 1

Study the food chain given below

\(M\rightarrow N\rightarrow O\rightarrow P\rightarrow Q\)

What will be the immediate impact if the population of 'P' is wiped out due to an illness?

  • A M, N, 0 and Q will also die
  • B The population of Q will decrease
  • C The population of 0 will decrease
  • D The population of Q will increase.

Question - 2

What is a long-term effect of clearing of larger areas of rain forest

  • A Decreased carbon dioxide content in the air
  • B Decreased flooding of low-lying land
  • C Increased rainfall in these areas
  • D Increased rate of soil erosion.

Question - 3

Which of the following statements is incorrect?

  • A Some bacteria and fungi absorb nutrients from dead plants and animals
  • B Snails, millipedes, termites and woodlice are decomposers.
  • C Decomposers break down dead matter and wastes into minerals
  • D Mould can cause food to decay

Question - 4

Which of the following is NOT a consequence of deforestation?

  • A Increased levels of ground water
  • B Removalof the top layerofsoil bywind
  • C Increased levels of carbon dioxide in the atmosphere.
  • D Destruction of the natural habitats of plants and animals

Question - 5

What is the name of the process 'X' in the figure

  • A Respiration
  • B Breathing
  • C Feeding
  • D Photosynthesis

Question - 6

Which statement describes a food web?

  • A It is made up of an extra long food chain
  • B It is a food chain with goat as a consumer
  • C It is a food chain with man as the final consumer
  • D It is made up of many interconnecting food chains

Question - 7

Which of the following gases is increased in air in the absence of forests

  • A Oxygen
  • B Nitrogen
  • C Carbon dioxide
  • D Hydrogen

Question - 8

Study the given diagram

Which of the following components is exchanged by plants and animals for their life processes to take place

  • A Space
  • B Gases
  • C Water
  • D Nutrients

Question - 9

Which of the following organisms are called decomposers

(i) Ants (ii) Bacteria
(iii) Fungi (iv) Worms
  • A (i) and (ii) only
  • B (ij) and (iii) only
  • C (i), (ii) and (iii) only
  • D (ii), (iii) and (iv) only

Question - 10

Which of the following groups consists of a decomposer, a producer and a predator respectively

  • A Grass, goat and eagle
  • B Mould, sugarcane and lizard
  • C Papaya plant, caterpillar and bird
  • D toad stool, rotting log and earth-worm.