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Anatomy of Flowering Plants — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYAnatomy of Flowering Plants3 Marks
Question
A transverse section of a trunk shows alternate concentric rings
  1. What are these rings known as?
  2. How are these rings formed?
  3. What is the significance of these alternate concentric rings?
OR
A transverse section of a stem of a tree shows concentric rings. How are these rings formed? Statethe significance of these rings.
✓

Answer

  1. These rings are known as annual ring.
  2.  
  • The activity of cambium is influenced by internal factors as well as external factors.
  • In spring season, the cambium is active and produces large number of xylary elements, with larger diameter; the wood formed in spring, is called early wood or spring wood.
  • In winter, the cambium is less active and produces few xylary elements, that too with narrow vessels; the wood formed in winter, is called late wood or autumn wood.
  • These two types of wood appear as alternate concentric rings and constitute the annual rings.
  1. The age of a tree can be calculated by counting the number of annual rings.

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