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  • An annual ring is formed by  Option: 1 Two consecutive rings of spring woodOption: 2</stron

An annual ring is formed by
 

Option: 1

Two consecutive rings of spring wood


Option: 2

Two alternate rings of spring wood and autumn wood


Option: 3

Two consecutive rings of autumn wood 


Option: 4

Two alternate rings of sapwood and heartwood

 


Answers (1)

best_answer

Secondary Growth in Intrastelar Region of Dicot Stem - Annual Rings

  • The activity of the cambium is markedly affected by environmental fluctuations.     
  • In temperate regions, these fluctuations have a great role in defining the activity of the cambium. 
  • During the spring season, the activity of thee cambium increases. 
  • It produces a large number of xylary elements with wider lumen.
  • The wood formed during this season is called spring wood or early wood.
  • During the autumn season, the activity of cambium reduces.
  • It produces narrow vessels in secondary xylem. A large amount of xylem fibres are produced.
  • The wood formed during the autumn season is called autumn wood or late wood.
  • The early wood and late wood occur in the form of two concentric rings, forming a single annual ring.
  • An annual ring is called so because it is produced in a span of a year.
  • The annual rings reflect the age of trees.
  • Determination of age of tree by counting the annual rings in called dendrochronology.
  • The activity of cambium is also affected by disease, drought, defoliation, etc. In such conditions false rings can be observed.
  • In tropical trees, there is no annual rings formation because of uniformity in climate.
  • In roots, the annual rings are not visible because inside the soil the temperature remains constant throughout the year.
  • The roots of Salix are an exception because the annual rings are visible in them.
     

- The early wood and late wood occur in the form of two concentric rings, forming a single annual ring.

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