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Most of vertebrates can maintain a const...

Most of vertebrates can maintain a constant internal osmolarity different from the surrounding medium, except

A

Myxine

B

Sharks

C

Bony fishes

D

Both (1) & (2)

Text Solution

Verified by Experts

The correct Answer is:
D
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Fill in the blanks : (i) Annelids have......and insects have........for excretion. (ii) Organisms that show changes in the concentration of body fluids according to the concentration of surrounding medium are called......and those which maintain an internal osmolarity different from the surrounding medium in which they live are called...... . (iii) Sharks and coelacanths reduce the osmoregulatory challenges by retaining..........and.........respectively in their body fluids making them slightly hypertonic to sea water. (iv) In earthworm, depending upon their position, septal nephridia are........and pharyngeal nephridia are.......... . (v) Blood enters the glomerulus via..........arteriole acid leaves via....arteriole.

Name two vertebrates which do not maintain the osmolarity of body fluid.

Knowledge Check

  • Organisms that can maintain a constant internal temperature are called as

    A
    homoiothermic
    B
    poikilothermic
    C
    oilgothermic
    D
    heterothermic

  • Organisms that cannot maintain a constant internal environment are known as

    A
    regulators
    B
    conformers
    C
    partial regulators
    D
    partial conformers

  • A : DNase can inhibit the process of transformation. R : Transformation is absorption of DNA segment from the surrounding medium by a living bacterium.

    A
    If both assertion & reason are true and the reason is the correct explanation of the assertion
    B
    If both assertion & reason are true but the reason is not the correct explanation of the assertion
    C
    If assertion is true statement but reason is false
    D
    If both assertion and reason are false statements

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    Nearly all plants and an overwhelming majority of animals are categorised as (A) Conformers - They can maintain a constant internal environment (B) Conformers - They cannot maintain a constant internal environment (C) Regulators - They can maintain a constant internal environment (D) Regulators - They cannot maintain a constant internal environment

    The organisms which can maintain a constant body temperature are

    I. Conformers are the organisms that cannot maintain a constant internal environment. II. 99% animals and nearly all plants cannot maintain their constant internal environments III. During the course of evolution, the cost and benefits of maintaining a constant internal environment are discarded. IV. Conformity is a condition in which an external challenge induces parallel internal changes. V. Regulation is a condition in which external challenge elicits compensatory action to maintain the internal environment.

    Assertion : Process of maintaining a constant internal environment is known as homeostasis . Reason : Kidneys are excretory and homeostatic organs.

    $ Homoestasis is the capacity of a living organisms to maintain its constant internal conditions. Majority of homoestatic processes occur with the help of oxygen.

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