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Which of the following statements correctly describe trophic organization and levels within an ecosystem?

  1. Trophic organization represents the pattern of food relationships in an ecosystem.
  2. Producers, such as green plants, always occupy the first trophic level.
  3. Herbivores, which feed on producers, are positioned at the third trophic level.
  4. Trophic levels sequentially represent different feeding positions from producers to top consumers.

    A2, 3

    B1, 2

    C4

    D1, 2, 4

    Answer:

    D. 1, 2, 4

    Read Explanation:

    • Trophic organization is fundamental to understanding energy flow and nutrient cycling in an ecosystem.

    • It clearly defines who eats whom and where organisms fit in the food chain.

    • The first trophic level, comprised of producers, forms the base of this organization, as they are capable of creating their own food through photosynthesis.

    • Consumers then occupy subsequent levels, with herbivores (primary consumers) at the second level, carnivores feeding on herbivores (secondary consumers) at the third, and so on.

    • This structured feeding hierarchy is crucial for maintaining ecological balance.


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    Ozone at ground level is mainly formed by:

    Regarding the factors influencing zonation in lake ecosystems, which statement is correct?

    1. Horizontal zonation in lakes is solely determined by the direct influence of sunlight and temperature.
    2. Vertical zonation is a direct result of temperature, sunlight, and oxygen gradients.
    3. The distribution of lake organisms does not play a role in horizontal zonation.
    4. Dissolved oxygen levels are uniform at all depths in a lake.
      ഒരു കുളത്തിന്റെ ആവാസവ്യവസ്ഥയിൽ, ഭക്ഷണ ശൃംഖല എന്തിൽനിന്നും ആരംഭിക്കുന്നു ?

      What are the primary ways dissolved oxygen is lost from an aquatic ecosystem?

      1. Through respiration by aquatic organisms.
      2. Through the air-water interface.
      3. Through photosynthesis by aquatic plants.
      4. Through absorption by the substrate at the bottom of the water body.

        Which of the following statements accurately describes how nutrients enter ecosystems?

        1. Chemical weathering of rocks contributes to nutrients entry
        2. Biological fixation of atmospheric oxygen is a primary way nutrients enter ecosystems.
        3. Deposition of nutrients from the atmosphere through rain or wind-blown particles facilitates nutrient entry.
        4. Fertilization is a significant nutrient input, especially in unmanaged ecosystems.