Secondary growth  is present in

(A)stelar region

(B)extra stelar region

(C)Both A and B

(D)None of these

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Interfascicular cambium is formed from

(A)medullary rays

(B)intrafascicular cambium

(C)cork cambium

(D)pericycle

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Vascular cambium includes

(A)only intrafascicular cambium

(B)only interfascicular cambium

(C)Both intrafascicular and interfascicular cambium

(D)cork cambium

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The cells which are formed from vascular cambium towards the centre are____________and towards the periphery are _________________

(A)secondary xylem, secondary phloem

(B)bast, wood

(C)wood, bast

(D)Both A and C

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The secondary xylem is produced more because

(A)cambium is more active towards the inner side

(B)cambium is more active towards the outer side

(C)xylem is more important than phloem

(D)All of the above

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The primary and secondary phloems get gradually crushed because of

(A) continuous formation and accumulation of  secondary xylem

(B)discontinuous formation and accumulation of secondary xylem

(C)by pressure of secondary xylem as they are continuously formed   

(D)Both A and C    

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Primary xylem remains less or more intact towards the __________

(A) around the centre

(B) around the periphery

(C)outer to the pith

(D)Both A and C

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Secondary medullary rays are formed from

(A)rays initials  of vascular cambium

(B)fusiform initials of vascular cambium

(C)Both A and B

(D) neither fusiform initials nor ray initials

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Which one is correct for spring wood

(A)It is formed due more activity of cambium

(B)It produces more xylary elements having vessels with wider cavities

(C)It is also called as early wood

(D)All of the above

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Which one is correct for autumn wood

(A)It is formed due less activity of cambium

(B)It produces fewer xylary elements having  narrow vessels

(C)It is also called as late wood

(D)All of the above

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