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Ecosystem Test - 52

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Ecosystem Test - 52
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Out of nutrient cycles of sulphur (a) phosphorus (b) carbon (c) and nitrogen (d), which one is sedimentary?
    Solution
    Biochemical cycle is also called as biogeochemical cycle or nutrient cycle. Biochemical cycle with gaseous phase includes various cycles like carbon cycle, nitrogen cycle, oxygen cycle. The nitrogen, carbon and oxygen are found in the gaseous form in the atmosphere. Calcium cycle, sodium cycle, phosphorous cycle, iron cycle, magnesium cycle, sulfur cycle are sedimentary cycles.
    Thus, the correct answer is 'a and b only.'
  • Question 2
    1 / -0
    Which one of the following representations shows the pyramid of numbers in a forest ecosystem?

    Solution
    Correct option: D
    Explanation:
    • The ecological pyramids are a graphical representation of the energy, number, or biomass of an ecosystem.
    • The pyramid of number and biomass can be inverted too.
    • The pyramid of numbers for a forest ecosystem is spindle-shaped.
    • It is because the producers are present in less number as compared to consumers and this is best depicted in graph C.
    Hence, "C" represents the pyramid of numbers in a forest ecosystem.
  • Question 3
    1 / -0
    For the sedimentary type of biogeochemical cycles, the reservoir is 
    Solution
    Biogeochemical cycles are also called as nutrient cycles. It includes gaseous cycles such as carbon cycle, oxygen cycle and sedimentary cycle. Sedimentary cycle consists of weathering of an existing rock followed by the erosion of minerals, transport and deposition. It has earth's crust as the reservoir pool. Examples of sedimentary cycle include sulphur cycle, phosphorous cycle, iron cycle, calcium cycle.
    Thus, the correct answer is 'Earth's crust.'
  • Question 4
    1 / -0
    If the energy produced at the level of producers is 1000 J, the energy available for the secondary consumers is
    Solution
    In a food chain, only 10% of energy is transferred from one trophic level to another trophic level. If the energy produced at the producer level is 1000 J, then the energy available at the primary consumer level will be 100 J and energy available at the secondary consumer level will be 10 J.
    Thus, the correct answer is '10 J'.
  • Question 5
    1 / -0
    Select the correct statement.
    Solution
    Phosphorous cycle, sulfur cycle are examples of sedimentary cycles. Carbon cycle, oxygen cycle are examples of gaseous nutrient cycles. The pyramid of biomass indicates the total biomass at each trophic level. The pyramid of biomass in sea is generally inverted. In this, the minimum biomass is present in the first trophic level. By the process of humification, humus is formed on the soil horizon. A given organism may occupy more than one trophic level simultaneously. For example, humans eat producers. Hence, they occupy second trophic level. Humans also eat primary consumers. Hence, they occupy third trophic level. Pyramid of energy indicates the total amount of energy at each trophic level. Pyramid of energy is always upright as only about 10% of energy is transferred from one trophic level to another trophic level.
    Thus, the correct answer is 'The pyramid of biomass in sea is generally inverted.'
  • Question 6
    1 / -0
    Which of the following statements is incorrect?
    Solution
    The species that invade a bare area are called pioneer species. In primary succession on rocks, the pioneer species were lichens. The entire sequence of communities that successively change in a given area called sere. The individual transitional community is called seral stage. Pyramid of energy is always upright. Only 10% of energy is transferred from one trophic level to successive trophic level in a pyramid. Pyramid of numbers in a tree ecosystem can be inverted. In this, the first trophic level contains minimum number of individuals and top trophic level contains maximum number of individuals.
    Thus, the correct answer is 'Pyramid of energy is always inverted.'
  • Question 7
    1 / -0
    In which of the following both pairs have correct combination?
    Solution
    There are various nutrient cycles in an ecosystem which recycles the essential nutrients. The cycles are also called as biogeochemical cycles. Gaseous nutrient cycles include carbon cycle, oxygen cycle, nitrogen cycle. In these cycles, the element is released in the air. Sedimentary nutrient cycles include sulphur cycle, phosphorus cycle. In these cycles, the element is released in the sedimentary rocks.
    Thus, the correct answer is 'Gaseous nutrient cycle - Carbon and nitrogen
    Sedimentatry nutrient cycle - Sulphur and phosphorus.'
  • Question 8
    1 / -0
    Which is correct about GPP and NPP in a ecosystem?
    Solution
    In a food chain, energy stored at the producer level is called as primary productivity (PP). 
    Energy stored at the consumer level is called as secondary productivity. It is the rate of energy storage at the consumer level. 
    Consumer-level includes herbivores, carnivores and decomposers. Gross primary productivity (GPP) is the rate of photosynthesis. 
    Net primary productivity (NPP) is the rate of storage of organic matter except which is utilized for the respiration by plants. 
    Hence, we can say that NPP = GPP - plant respiration. It is the total biomass available for consumers.
    Thus, the correct answer is 'NPP = GPP - Plant respiration.'
  • Question 9
    1 / -0
    Biomass available for consumers and rate of formation of new organic matter by consumers are
    Solution
    In a food chain, energy stored at the producer level is called as primary productivity. Energy stored at the consumer level is called as secondary productivity. In other words, it is the rate of formation of new organic matter by consumers. It is the rate of energy storage at consumer level. Consumer level includes herbivores, carnivores and decomposers. Gross primary productivity is the rate of photosynthesis. Net primary productivity is the rate of storage of organic matter except which is utilized for the respiration by plants. It is the total biomass available for consumers. 
    Thus, the correct answer is 'Net primary productivity and secondary productivity.'
  • Question 10
    1 / -0
    Gross primary productivity is the rate of production of ____ during photosynthesis.
    Solution
    In a food chain, energy stored at the producer level is called as primary productivity. Energy stored at the consumer level is called as secondary productivity. In other words, it is the rate of formation of new organic matter by consumers. It is the rate of energy storage at consumer level. Consumer level includes herbivores, carnivores and decomposers. Gross primary productivity is the rate of production of organic matter during photosynthesis. Net primary productivity is the rate of storage of organic matter except which is utilized for the respiration by plants. It is the total biomass available for consumers. 
    Thus, the correct answer is 'Organic matter.'
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