Life on the Earth

  • Question 5
    CBSEENGE11010982

    Define ecological system. 

    Solution
    The interactions of a particular group of organisms with abiotic factors within a particular habitat resulting in clearly defined energy flows and material cycles on land, water and air, are called ecological systems.
    Question 6
    CBSEENGE11010983

    Who are decomposer? State two scavengers. 

    Solution
    Decomposers are those that feed on dead organisms, and further breaking down of the dead matter by other decomposing agents like bacteria and various microorganisms.
    For example, scavengers like vultures and crows.
    Question 7
    CBSEENGE11010984

    What are two types of ecosystems? 

    Solution

    Ecosystems are of two major types:

    i. terrestrial

    ii. aquatic.

    Question 8
    CBSEENGE11010985

    Describe ecological efficiency.

    Solution
    The percentage of energy transferred from one trophic level to another is called ecological efficiency. The efficiency of energy transfer from one trophic level to another varies from 5% to 20% depending on the types of organisms and environmental conditions.

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