Life on the Earth

  • Question 21
    CBSEENGE11010998

    What are algae? Mention their common characteristics and types.

    Solution
    Algae are primitive plants in which the body is not divided into roots, stems and leaves. These are green and thus autotrophic in nature. Algae can prepare their own food in the form of glucose. The food is stored in the form of starch. The algae reproduce asexually by zoospores and sexually by gametes.
    Question 22
    CBSEENGE11010999

    What is species diversity ?

    Solution
    The variation in the physical features of species.
    Question 23
    CBSEENGE11011000

    What are three inorganic realms of the earth where life is present ?

    Solution
    They are Lithosphere, Atmosphere and Hydrosphere.
    Question 24
    CBSEENGE11011001

    On what criteria the classification of kingdoms is done ?

    Solution
    The classification of kingdoms is made on the following criteria :

    1. Complexity of cell structure.

    2. Complexity of organism's body.

    3. Mode of obtaining nutrition.

    NCERT Book Store

    NCERT Sample Papers

    Entrance Exams Preparation