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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Difficulty Level:


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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More distinct annual rings are present where climate conditions are

(A) non uniform

(B)uniform

(C)Temperate regions

(D)Both A and C

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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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Difficulty Level: