How many of the statements are  true for heartwood

  1. It provides mechanical support to the stem
  2. It does not conduct water
  3. It is hard, durable and resistant to the attacks of microbes
  4. It is the innermost layer of the wood
  5. It comprises dead elements with highly lignified walls
  6. More the heartwood is present the better is the quality of the wood

(A)4

(B)5

(C)6

(D)3

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