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Botany - Secondary Growth Two Marks Questions

11th Standard

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Biology

Time : 00:45:00 Hrs
Total Marks : 30
    15 x 2 = 30
  1. In a forest, if the bark of a tree is damaged by the horn of a deer, How will the plant overcome the damage?

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

  3. Central part of the wood is always dark. Why?

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

  5. What are pseudo or false annual rings?

  6. What is the importance of studying growth rings?

  7. What is the Significance of bark?

  8. What is the source of of turpentine?

  9. Distinguish between Intrafascicular cambium and Interfascicular cambium?

  10. How is vascular cambium classified?

  11. Name two commercially important Bast fibres and their source.

  12. Define 'Bark'?

  13. What is the unique feature of wood as a raw material?

  14. Distinct Annual rings are not found in plants found in seashore region. Justify.

  15. A plant dies if the Sap wood is destroyed ? Justify.

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