1. An organism which is simple is called primitive. On the other hand, an organism with high level of division of labour, by formation of organs and organ system is called advanced. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-7/

    An organism which is simple is called primitive. On the other hand, an organism with high level
    of division of labour, by formation of organs and organ system is called advanced.

    For more answers visit to website:
    https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-7/

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  2. Plants are autotrophs, while animals are heterotrophs. Cell wall is present in plant cells, while it is absent in animal cells. Plants do not need to move from one place to another, while most of the animals need to move in search of food. For more answers visit to website: https://www.tiwariacademyRead more

    Plants are autotrophs, while animals are heterotrophs. Cell wall is present in plant cells, while it is absent in animal cells. Plants do not need to move from one place to another, while most of the animals need to move in search of food.

    For more answers visit to website:
    https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-7/

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  3. Organisation of nucleus is the primary characteristic on which the first division of organisms is made. Based on this, organisms can be either prokaryotic or eukaryotic. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-7/

    Organisation of nucleus is the primary characteristic on which the first division of organisms is
    made. Based on this, organisms can be either prokaryotic or eukaryotic.

    For more answers visit to website:
    https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-7/

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  4. The kind of cells an organism is made of is more basic characteristic of classifying organism because it gives a scientific angle to classification. Moreover, a particular dwelling place can be full of organisms of a wide variety. For more answers visit to website: https://www.tiwariacademy.com/ncerRead more

    The kind of cells an organism is made of is more basic characteristic of classifying organism
    because it gives a scientific angle to classification. Moreover, a particular dwelling place can be
    full of organisms of a wide variety.

    For more answers visit to website:
    https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-7/

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  5. Three examples of the range of variations in life forms: - Ants, cockroaches, spiders, houseflies, etc. live in the same building. They look entirely different from each other yet all of them belong to arthropoda. - Humans, monkeys, cats and dogs lives in the same neighbourhood. They look entirely dRead more

    Three examples of the range of variations in life forms:
    – Ants, cockroaches, spiders, houseflies, etc. live in the same building. They look entirely different
    from each other yet all of them belong to arthropoda.
    – Humans, monkeys, cats and dogs lives in the same neighbourhood. They look entirely different
    yet all of them belong to mammalia.
    – A nearby park may show wide variety of plants; right from small grass to a giant banyan tree.

    For more answers visit to website:
    https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-7/

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