Structure of platyhelminths


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Platyhelminths have highly branched intestine due to the lack of which of the following structures?
i. anus
ii. circulatory system
iii. coelom
iv. accessory digestive glands
(a) i, ii & iii (b) ii, iii & iv (c) i, ii & iv (d) only i & ii

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  1. Jagrati Parashar
    August 3, 2017 at 12:28 pm

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    (i) Anus

    (ii) Circulatory system

    (iii) Coelom

    These are bilaterally symmetrical and triploblastic. Flat worms have no body cavity other than the gut and lack an anus (the same pharyngeal opening both takes in food and expels waste).

    Because of the lack of any other body cavity in larger flatworms, the gut is often very highly branched in order to transport food to all parts of the body. The lack of cavity (Coelom) also constraints flatworms to be flat. They must respire by diffusion and no cell can be too far from the outside making a flattened shape necessary.

    The circulatory system is absent and incomplete alimentary canal is present.

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