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Which statement best describes the concept of biodiversity?

  1. Biodiversity refers exclusively to the variety of animal species in a specific region.
  2. Biodiversity is the name given to the variety of ecosystems, species, and genes in the world or in a particular habitat.
  3. Biodiversity is another term for ecological succession.

    AAll

    B2 only

    C1, 2

    D3 only

    Answer:

    B. 2 only

    Read Explanation:

    • Biodiversity, short for biological diversity, encompasses the vast array of life on Earth at multiple levels.

    • It includes ecosystem diversity (the variety of habitats, biotic communities, and ecological processes), species diversity (the number and abundance of different species), and genetic diversity (the variation of genes within a species).

    • This rich tapestry of life is crucial for the stability and resilience of natural systems.


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    Which condition is necessary for an area to be declared a biodiversity hotspot?

    What defines the photic zone in an aquatic ecosystem?

    1. The region where light penetrates sufficiently for photosynthesis to occur.
    2. The deepest part of the water body where no light reaches.
    3. The layer of water where temperature is consistently low.
    4. The area where dissolved oxygen levels are at their highest.

      Which of the following statements accurately describe Neuston organisms?

      1. Neuston are organisms that live attached to submerged surfaces.
      2. These organisms reside at the air-water interface, such as floating plants and certain animals.
      3. Water striders are an example of Neuston that spend most of their lives on top of the air-water interface.
      4. Neuston obtain all their nutrients and sustenance directly from the air.

        What are the key factors contributing to pronounced thermal stratification in lakes during summer?

        1. Increased solar intensity during summer heats the surface layer significantly, while lower layers remain cooler.
        2. The rapid mixing of water layers by strong winds prevents the formation of distinct temperature gradients.
        3. The thermally stratified layers offer resistance to mixing by wind, helping to maintain the temperature differences.
        4. A decrease in solar radiation during summer leads to the formation of thermal gradients.

          What is salinisation?

          1. Salinity refers to the salt content of the soil.
          2. Salinisation is a decrease in the concentration of salts in the soil.
          3. Salinisation is a problem primarily found in non-irrigated arid regions.