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Ecosystem Test - 30

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Ecosystem Test - 30
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which one of these is a sedimentary cycle?
    Solution
    Phosphorus cycle is an example for sedimentary cycle. 
    A cycle which comprises the weathering of an existing rock, followed by the erosion of minerals, their transport and deposition, then burial, is called as sedimentary cycle. 
    First cycle sediments are characterized by the presence of less resistant minerals and rock fragments. If this material is reworked through a second cycle, the less resistant minerals will be eliminated or altered to more stable products. 
    The more sedimentary cycles, that a sediment has passed through the more mature, it will become and it will be dominated by well rounded resistant minerals.
  • Question 2
    1 / -0
    Natural reservoir of phosphorus is 
    Solution
    Sedimentary rocks are the largest reservoir of the phosphorous .Phosphates are removed from the rocks (via weathering) and are distributed throughout both soils and water. Plants take up the phosphate ions from the soil. The phosphates then move from plants to animals when herbivores eat plants and carnivores eat plants or herbivores. The phosphates absorbed by animal tissue through consumption eventually returns to the soil through the excretion of urine and feces, as well as from the final decomposition of plants and animals after death. Hence option B is correct.
  • Question 3
    1 / -0
    Select the correct matched ones.
    A. Sedimentary nutrient- Nitrogen cycle
    B. Pioneer species- Lichens 
    C. Secondary succession- Burned forests
    D. Pyramid of biomass in sea- Upright 
    Solution
    Pioneer species are those species which are the first one to appear in an ecosystem which has been disrupted earlier. For example - lichens.
    Sedimentary cycles include those of iron, calcium, phosphorus and other more earthbound elements. It never includes nitrogen. The nitrogen cycle is considered as a gaseous cycle. 
    Secondary succession occurs in a region where the ecosystem has been colonised earlier but they have been distorted by any natural calamities. For example forest fire.
    The pyramid of biomass in the sea is inverted. Because the productivity of phytoplankton is so high, that a smaller biomass can support a larger mass of consumers.
    Therefore, the correct answer is option C.
  • Question 4
    1 / -0
    Which of the following is formed by producers in ecosystem?
    Solution
    • In an ecosystem, the rate of production or accumulation of organic matter per unit area per unit time is called productivity. 
    • Plants are autotrophic. They perform photosynthesis by using solar energy to synthesize their own food. Hence they are the producers in an ecosystem.
    • The rate at which solar energy is stored by producers is called primary productivity. 
    Thus the correct answer is option D.
  • Question 5
    1 / -0
    Secondary productivity is 
    Solution
    Secondary productivity is the rate of biomass formation or energy fixation by heterotrophic organisms, such as grazers and decomposers. These derive all their energy from photosynthetic plants and other autotrophs, either directly or indirectly, and their productivity determines the number of trophic levels and the lengths of the food chains within an ecosystem - both of which are likely to be increased by greater secondary productivity. Secondary productivity is the rate at which the consumers convert the chemical energy of their food into their own biomass is called as secondary productivity. The efficiency at which energy is transferred from one trophic level to another is called as ecological efficiency. On average it is estimated that there is only a 10 percent transfer of energy.
    The correct answer is option C. 
  • Question 6
    1 / -0
    An ecosystem resists change because it is in a state of
    Solution
    • An ecosystem resists change because it is in a state of homeostasis.
    • Homeostasis is also known as a biological equilibrium. 
    • Equilibrium is the steady-state of an ecosystem where all organisms are in balance.
    • The balance is maintained by a number of factors. These include the carrying capacity of the environment and the capacity for recycling waste.

    So, the correct answer is 'Homeostasis'.
  • Question 7
    1 / -0
    Which one of the following is sedimentary cycle? 
    Solution
    Sedimentary cycles are those cycles which include the weathering of rocks and erosion of minerals along with its circulation in the environment and back to earth crust. It includes those of iron, calcium, phosphorus and other more earthbound elements. Phosphorus cycle is also a type of sedimentary cycle. It is because of the sedimentary rocks, as well as the other type of rocks on weathering, gives rise to the cycling of phosphorus from the abiotic to the biotic and back.
    So, the correct answer is option D.
  • Question 8
    1 / -0
    Biogeochemical cycle of which element has atmospheric phase?
    Solution
    The carbon cycle involves the exchange of carbon among the biosphere, pedosphere, geosphere, hydrosphere and atmosphere of the Earth. 

  • Question 9
    1 / -0
    Plant community development is termed as
    Solution
    Ecological succession is the process of change in the species structure of an ecological community over time. There are two different types of succession—primary and secondary have been distinguished. Primary succession takes place new substrate devoid of vegetation and other organisms usually lacking soil, such as a lava flow or area left from retreated glacier, is deposited. Secondary succession takes place in response to the natural disturbance like the flood. Thus, the correct answer is option C.
  • Question 10
    1 / -0
    The graphic representation of trophic level is represented by a pyramid. Which of the following pyramid is always a true pyramid unlike the others?
    Solution
    Pyramid of energy is always upright which makes it true pyramid because when energy flows from a particular trophic level to the next trophic level is always lost at each step by the metabolic activity and only 10% energy transfers from one to next trophic level. Thus, the correct answer is option C.
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