NEET AIPMT SOLVED PAPER MAINS 2010

  • question_answer
    In which one of the following organism, its excretory organs are correctly stated?

    A)  Humans              - Kidneys, sebaceous glands and tear glands

    B)  Earthworm        - Pharyngeal, integumentary and septal nephridia

    C)  Cockroach          - Malpighian tubules and enteric caeca

    D)  Frog                      - Kidneys, skin and buccal epithelium

    Correct Answer: B

    Solution :

    In earthworm, excretory system is made up of many segmentally arranged microscopic coiled tubes called nephridia. These are ectodermal in origin and analogous to vertebrate kidney. In origin and analogous to vertebrate kidney. In Pheretima, following three types of nephridia are seen. (i) Pharyngeal nephridia-Situated in either side of pharynx and oesophagus in 4th, 5* and 6th segment. (ii) Integumentary nephridia-Scattered in the body wall, seen from 7th segment onwards. (iii) Septal nephridia- Largest nephridia attached to both faces of each intersegment septum behind 15th segment.


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