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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The early wood is ___________ in color and late wood is ____________ in color.

(A)lighter, darker

(B)darker, lighter

(C)lighter, lighter

(D)darker, darker

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The early wood has ___________ density and late wood has ____________ density.

(A)lower, higher

(B)higher, lower

(C)lower, lower

(D)higher, higher

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Which one is true for annual ring

(A) A ring of autumn wood and a ring of spring wood constitute annual ring

(B) It appears as alternate concentric ring

(C)It gives an estimate of the age of the tree.

(D)All of the above

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