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ISC Class 12 Ecology and Environment — practice questions — page 2

Explore 50 free Ecology and Environment questions in ISC Class 12 Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Ecology and Environment questions and exercises with answers

Showing questions 31–50 of 50.

Raw material for decomposition is called:Read the answer and worked solution →Decomposition is slower when detritus is rich in:Read the answer and worked solution →Which conditions favour decomposition?Read the answer and worked solution →The mass of living material at a trophic level is the:Read the answer and worked solution →The pyramid of biomass in the sea is generally:Read the answer and worked solution →Which ecological pyramid can never be inverted?Read the answer and worked solution →Which group is left out of ecological pyramids?Read the answer and worked solution →Sort by trophic levelRead the answer and worked solution →Which is a man-made ecosystem?Read the answer and worked solution →NEET · Biology · Tap Real Air PollutantsRead the answer and worked solution →NEET · Biology · Biodiversity Hotspot ↔ RegionRead the answer and worked solution →NEET · Biology · Biomes ↔ ClimateRead the answer and worked solution →NEET · Biology · Trophic Levels — Memory FlipRead the answer and worked solution →Match the ecosystem termRead the answer and worked solution →Complete the productivity ruleRead the answer and worked solution →Terrestrial or aquatic?Read the answer and worked solution →Which of these is a terrestrial ecosystem?Read the answer and worked solution →The rate of biomass production is called:Read the answer and worked solution →The rate at which consumers form new organic matter is:Read the answer and worked solution →Order the steps of decompositionRead the answer and worked solution →

Worked practice questions

Raw material for decomposition is called:

  1. Humussss
  2. Mineralss
  3. Producers
  4. Detritus
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Correct answer: D. Detritus

1. Dead leaves, bark, flowers and faecal matter pile up. 2. Decomposers work on this material. 3. It is called detritus. 4. So the answer is detritus. _Source: syllabus Biology, Ch 12 'Ecosystem'_

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Decomposition is slower when detritus is rich in:

  1. Nitrogen and salt
  2. Starch and sugar
  3. Lignin and chitin
  4. Sugars and water
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Correct answer: C. Lignin and chitin

1. Chemical composition of detritus sets the pace. 2. Nitrogen and soluble sugars speed decomposition up. 3. Lignin and chitin slow it down. 4. So the answer is lignin and chitin. _Source: syllabus Biology, Ch 12 'Ecosystem'_

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Which conditions favour decomposition?

  1. Cold and moist
  2. Warm and frozen
  3. Cold and anoxic
  4. Warm and moist
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Correct answer: D. Warm and moist

1. Soil microbes drive the process. 2. Low temperature and anaerobiosis inhibit them. 3. A warm and moist environment favours decomposition. 4. So the answer is warm and moist. _Source: syllabus Biology, Ch 12 'Ecosystem'_

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