7th Class Science Transportation in Animals and Plants Question Bank Transportation in Plants and Animals

  • question_answer Read the given differences between X, Y and Z.         
    S. No X Y Z
    (i) They are thin walled vessels with a small lumen, They are thick walled vessels with narrow lumen, They are thin walled vessels with wide lumen.
    (ii) They deliver blood to the body cells. They carry blood away from the heart. They bring blood towards the heart.
    (iii) They are placed very deep. They are situated in the deeper regions of the body. They are superficially situated.
    (iv) They carry both oxygenated and deoxygenated blood They carry oxygenated blood, except one. They carry deoxygenated blood, except one.
    Select the correct statement regarding X, Y and Z.      

    A)  X is permeable to gases and other substances while Y and Z are impermeable.

    B)  X and Y are permeable to gases and other substances while Z is impermeable.        

    C)  X and Z are permeable to gases and other substances while Y is impermeable.        

    D)  Y is permeable to gases and other substances while X and Z are impermeable.

    Correct Answer: A

    Solution :

    According to the given differences, X, Y and Z refer to capillaries, arteries and veins respectively. Capillaries are permeable to gases and other substances while arteries and veins are impermeable to gases and other substances.


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