Bio - Botany - Secondary Growth Model Question Paper

11th Standard

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Biology

Time : 02:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. The common bottle cork is a product of

    (a)

    Dermatogen

    (b)

    Phellogen

    (c)

    Xylem

    (d)

    Vascular cambium

  2. 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

  3. The wood formed in spring season in called ____________

    (a)

    Hard wood

    (b)

    Soft wood

    (c)

    Early wood

    (d)

    Non porous wood

  4. Living part of the wood is called __________

    (a)

    Duramen 

    (b)

    Heart wood

    (c)

    Porous wood

    (d)

    Sap wood

  5. Gymnosperm wood is known as _______________

    (a)

    non porous wood

    (b)

    hard wood

    (c)

    porous wood

    (d)

    sap wood

  6. 6 x 2 = 12
  7. In a forest, if the bark of a tree is damaged by the horn of a deer, How will the plant overcome the damage?

  8. In which season the vessels of angiosperms are larger in size, why?

  9. Differentiate Porous or Hard wood and Non porous or Soft wood ?

  10. What are Phelloids?

  11. What is the Significance of bark?

  12. What is lenticel?

  13. 6 x 3 = 18
  14. A timber merchant bought 2 logs of wood from a forest & named them A & B, The log A was 50 year old & B was 20 years old. Which log of wood will last longer for the merchant? Why?

  15. What is Tyloses?

  16. How are barks classified?

  17. What are tylosoids?

  18. Differentiate Phellem and Phelloderm.

  19. What is Gum Arabic?

  20. 3 x 5 = 15
  21. Continuous state of dividing tissue is called meristem. In connection to this, what is the role of lateral meristem?

  22. 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?

  23. List the differences between Sap wood and Heart wood?

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