SSC General Science & Technology Sample Paper NCERT Sample Paper-3

  • question_answer
    Some animals have a unique method of bringing oxygen, directly to the cells. There are:

    A)  Spiders

    B)  scorpions

    C)  Insects 

    D)  flatworms

    Correct Answer: C

    Solution :

    [c] Instead of lungs, insects breathe with a network of tiny tubes called tracheae. Air enters the tubes through a row of holes along an insect's abdomen. The air then diffuses down the blind-ended tracheae. Since the biggest bugs have the longest tracheae, they should need the most oxygen to be able to breathe.

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