Excretion in Animals


 
 
Concept Explanation
 

Excretion in Animals

Excretion in animals: Many unicellular organisms like Amoeba throw out their wastes by diffusion from their body surface. Protozoans have no organs for excretion. As they live in an aquatic habitat, their wastes are eliminated by diffusion through the plasma membrane.

  • In simple terms, excretion can be defined as the removal of those substances from the body of an organism which is no more useful to the organism or simply waste for the organism. Thus, it is a process that helps to remove the metabolic wastes out from the body of an organism.
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    Sample Questions
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    Question : 1

    In higher multicellular organisms the excretory organs could be simple tubular structures called  _______________ in flatworms and leech.

     

    Right Option : B
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    Question : 2

    In vertebrates the main organs of excretion and maintenance of water balance are the ___________________ .

    Right Option : A
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    Question : 3

    Which of the following are correct ?

    (a) Simple multicellular organisms like Hydra throw out solid waste matter through their mouth. .

    (b) The excretory organs of insects (e.g., grasshopper, cockroach and housefly) are tubular and are known as Malpighian tubules. 

     

    Right Option : C
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