Botany - Secondary Growth Book Back Questions

11th Standard

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Biology

Time : 00:30:00 Hrs
Total Marks : 10
    3 x 1 = 3
  1. Usually, the monocotyledons do not increase their girth, because

    (a)

    They possess actively dividing cambium

    (b)

    They do not possess actively dividing cambium

    (c)

    Ceases activity of cambium

    (d)

    All are correct

  2. The common bottle cork is a product of

    (a)

    Dermatogen

    (b)

    Phellogen

    (c)

    Xylem

    (d)

    Vascular cambium

  3. What is the fate of primary xylem in a dicot root showing extensive secondary growth?

    (a)

    It is retained in the center of the axis

    (b)

    It gets crushed

    (c)

    May or may not get crushed

    (d)

    It gets surrounded by primary phloem

  4. 1 x 2 = 2
  5. In which season the vessels of angiosperms are larger in size, why?

  6. 1 x 5 = 5
  7. A transverse section of the trunk of a tree shows concentric rings which are known as growth rings. How are these rings formed? What is the significance of these rings?

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