Class 10 Biology



Environment

Exemplar Problems MCQ II

Excessive exposure of humans to U V-rays results in

  • damage to immune system
  • damage to lungs
  • skin cancer
  • peptic ulcers
  • (i) and (ii)
  • (ii) and (iv)
  • (i) and (iii)
  • (iii) and (iv)

    Answer: (c) (i) and (iii)

In the following groups of materials, which group (s) contains only non-biodegradable items?

  • Wood, paper, leather
  • Polythene, detergent, PVC
  • Plastic, detergent, grass
  • Plastic, bakelite, DDT
  • (iii)
  • (iv)
  • (i) and (iii)
  • (ii) and (iv)

    Answer: (d) (ii) and (iv)

Which of the following limits the number of trophic levels in a food chain?

  • Decrease in energy at higher trophic levels
  • Defficient food supply
  • Polluted air
  • Water

    Answer: (a) Decrease in energy at higher trophic levels

Which of the statement is incorrect?

  • All green plants and blue green algae are producers
  • Green plants get their food from organic compounds
  • Producers prepare their own food from inorganic compounds
  • Plants convert solar energy into chemical energy

    Answer: (b) Green plants get their food from organic compounds

Which group of organisms are not constituents of a food chain?

  • Grass, lion, rabbit, wolf
  • Plankton, man, fish, grasshopper
  • Wolf, grass, snake, tiger
  • Frog, snake, eagle, grass, grasshopper
  • (i) and (iii)
  • (iii) and (iv)
  • (ii) and (iii)
  • (i) and (iv)

    Answer: (c) (ii) and (iii)

The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about

  • 1%
  • 5%
  • 8%
  • 10%

    Answer: (a) 1%

Assume T1, T2, T3 and T4 are the various trophic levels from bottom to top in a pyramid. At which trophic level is maximum energy available?

  • T4
  • T2
  • T1
  • T3

    Answer: (c) T1

What will happen if deer is missing in the food chain given below?
Grass → Deer → Tiger

  • The population of tiger increases
  • The population of grass decreases
  • Tiger will start eating grass
  • The population of tiger decreases and the population of grass increases

    Answer: (d) The population of tiger decreases and the population of grass increases

The decomposers in an ecosystem

  • Convert inorganic material, to simpler forms
  • Convert organic material to inorganic forms
  • Convert inorganic materials into organic compounds
  • Do not breakdown organic compounds

    Answer: (b) Convert organic materials to inorganic forms

If a grass hopper is eaten by a frog, then the energy transfer will be from

  • Producer to decomposer
  • Producer to primary consumer
  • Primary consumer to secondary consumer
  • Secondary consumer to primary consumer

    Answer: (c) Primary consumer to secondary consumer

Disposable plastic plates should not be used because

  • They are made of materials with light weight
  • They are made of toxic materials
  • They are made of biodegradable materials
  • They are made of non-biodegradable materials

    Answer: (d) They are made of non-biodegradable materials