Annual rings are bands

(A)secondary xylem and xylem rays

(B)secondary phloem and phloem rays

(C) secondary phloem and xylem rays

(D) Both A and C

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Heartwood is

(A)dark brown in color

(B)contains organic compounds like tannin, resins, gums, oils

(C)known as duramen

(D)All of these

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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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Which one is true for sapwood

(A)It lies in the peripheral region of xylem

(B)It does conduction of water and minerals

(C)It is also called as alburnum

(D)All of the above

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Least distinct annual rings are present in regions like

(A)tropical areas

(B)desert

(C)coastal areas

(D)All of the above

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Secondary growth in extra stelar region is due to

(A)Phellogen

(B)Cork cambium

(C)Extrastelar cambium

(D)All of these

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Cork cambium is derived from the

(A)hypodermis

(B)outer layer of the cortex

(C)endodermis

(D)Both A and B

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Cork cambium gives rise

(A)cork

(B)phelloderm

(C)phellem

(D)All of the above

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Periderm comprises of

(A)Phellem

(B)phellogen

(C)phelloderm

(D)All of these

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The dead cells which are formed towards the epidermis by cork cambium are called as

(A)cork

(B)phellem

(C)phelloderm

(D)Both A and B

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