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CET Karnataka Medical CET - Karnataka Medical Solved Paper-2006

  • question_answer
    The following diagrams show the types of secondary thickenings in the xylem vessels. Identify the types labelled from A to F. Choose the correct option from those given:

    A)  A = spiral, B = annular, C = reticulate, D = scalariform, E = pitted with border, P = pitted, simple

    B)  A = annular, B = spiral, C = scalariform, D = reticulate, E = pitted with border, F = pitted, simple

    C)  A = annular, B = spiral, C = scalariform, D = reticulate, E = pitted, simple, F = pitted with border

    D)  A = spiral, B = annular, C = scalariform, D = reticulate, E = pitted with border, F = pitted, simple

    Correct Answer: B

    Solution :

    Trachieds (Sanio, 1863), are elongated dead cells having lignified walls with lumen which take part in the conduction of water. In the given figure the following types of trachieds are present. A-Annular (Ring like bands of thickenings) B-Spiral (Spiral or helical bands of thickenings) C-Scalarifrom   (Transverse   plates   of thickenings) D-Reticulate (Reticulum or network of thickenings). E-Pitted with border (narrow mouth and flask shaped chamber) F-Pitted, simple (uniform width)


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