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Ecosystem Test - 22

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Ecosystem Test - 22
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which of the following is the major source of phosphorus?
    Solution
    Phosphorus is a critical element. In living systems, it occurs in nucleic acids, nucleotides including ATP, bones, teeth, phospholipids etc. It is obtained from the soil as orthophosphates. Organic phosphorous circulates in nature from plants to animals. Phosphate is released by decomposers back to the soil. The reservoir pool for phosphorus is phosphates in rocks from which the phosphorus is slowly transferred to cycling pool.
  • Question 2
    1 / -0
    Cyclic succession is
    Solution
    Ecological Succession is the process of gradual changes in an ecological community. Ecological succession can be of three types- primary, secondary and cyclic. Cyclic succession can be defined as the change in the pattern of vegetation wherein a small number of species tend to replace each other over time in the absence of large-scale disturbances. Thus, the correct answer is option A.
  • Question 3
    1 / -0
    Out of the following options which most often limits the primary productivity of the ecosystem?
    Solution
    Of the incident solar radiation, less than 50 percent of it is photosynthetically active radiation (PAR). Plants are only able to capture 2-10 percent of PAR. Therefore solar radiation/light is the limiting factor in the primary productivity of the ecosystem.
    So the correct answer is "Solar radiation/light".
  • Question 4
    1 / -0
    Ecological succession on sand is
    Solution
    Correct Option: A
    Explanation:
    Primary succession can happen when bare sand is colonised by plants. Over time, the sand builds up into sand dunes, raising the ground above the height of sea level. Succession in sand dunes is sometimes called a psammosere.

  • Question 5
    1 / -0
    Pyramid of energy in a pond ecosystem is always 
    Solution
    • The pyramid of energy is the ecological pyramid that gives a graphic representation of the amount of energy trapped by different trophic levels per unit area. 
    • It is always upright because during the transfer of energy from one trophic level to the next a lot of wastage occurs in feeding, digestion, assimilation, and respiration i.e metabolism at each trophic level. 
    • Hence organisms of each trophic level have more energy than each succeeding trophic level and less energy than organisms at the previous trophic level.
    • So, the correct answer is option B.
  • Question 6
    1 / -0
    Which type of pyramid of energy  is inverted?
    Solution
    Pyramid of energy is ecological pyramid that gives graphic representation of amount of energy trapped by different trophic levels per unit area. It is always upright because during transfer of energy from one trophic level to the next a lot of wastage occurs in feeding, digestion, assimilation and respiration i.e metabolism at each trophic level. Hence, organisms of each trophic level have more energy than each succeeding trophic level and less energy than organisms at previous trophic level. Thus, the correct answer is option D.
  • Question 7
    1 / -0
    Desert can be converted into greenland by
    Solution
    Oxylophytes are plants growing in acidic soil. Psammophytes are plants growing on sand and gravel. Halophytes grow in saline conditions. Tropical trees are big trees growing in tropics.In case we want deserts to be converted to green land we should grow psammophytes like Haloxylon, Persicum, Calligonum, Ammondendron, Eremosparton, Smirnowia, Aristida etc So, the correct answer is 'Psammophytes'
  • Question 8
    1 / -0
    Climax vegetation of a region generally
    Solution
    • A climax community is a stable, self-perpetuating and final community appearing in an area at the end of biotic succession which is in perfect harmony with the climate of the area. 
    • Both xerach and hydrarch succession generally end in mesophytes. 
    • But the type of vegetation or types of plants inhabiting is decided by the climate of the region. For example, two places A and B both may have mesophytes but exactly which plants are growing in those locations is decided by the local climate. 

    So, the correct answer is option D.
  • Question 9
    1 / -0
    The final stable community in ecological succession is 
    Solution
    • The climax community is stable, self-perpetuating and final community appearing in an area at the end of biotic succession, which is in perfect harmony with the climate of the area. 
    • The vegetation in that particular area has been reached to a stable condition after ecological succession.

    So, the correct answer is option D.
  • Question 10
    1 / -0
    Which one of the following pairs is a sedimentary type of biogeochemical cycle
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