Life on the Earth

  • Question 9
    CBSEENGE11010986

    Mention the classes of the aquatic ecosystem. 

    Solution

    Aquatic ecosystems can be classed as:


    i. Marine ecosystems - Marine ecosystem includes the oceans, coastal estuaries and coral reefs.

    ii. Freshwater ecosystems - Freshwater ecosystem includes lakes, ponds, streams, marshes and bogs.
    Question 10
    CBSEENGE11010987

    What are detritus feeders?

    Solution
    A fourth group of consumers feeding in the ocean waters or decomposed tissues of plant, animals are called detritus feeders.
    Question 11
    CBSEENGE11010988

    What are aquatic eco-systems ?

    Solution
    Aquatic eco-systems include fresh water lakes, rivers, estuaries, neritic zones, etc. The concentration of dissolved oxygen and the sunlight penetration of water and availability of nutrients are limiting factors for aquatic organisms.
    Question 12
    CBSEENGE11010989

    What are planktons ?

    Solution
    A number of organisms which have no measured population.

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