The primary and secondary phloems get gradually crushed because of

(1) continuous formation and accumulation of  secondary xylem

(2)discontinuous formation and accumulation of secondary xylem

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

(4)Both A and C    

Primary xylem remains less or more intact towards the __________

(1) around the centre

(2) around the periphery

(3)outer to the pith

(4)Both A and C

Which one is correct for spring wood

(1)It is formed due more activity of cambium

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

(3)It is also called as early wood

(4)All of the above

Which one is correct for autumn wood

(1)It is formed due less activity of cambium

(2)It produces fewer xylary elements having  narrow vessels

(3)It is also called as late wood

(4)All of the above

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

(1)lighter, darker

(2)darker, lighter

(3)lighter, lighter

(4)darker, darker

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

(1)lower, higher

(2)higher, lower

(3)lower, lower

(4)higher, higher

Which one is true for annual ring

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

(2) It appears as alternate concentric ring

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

(4)All of the above

Heartwood is

(1)dark brown in color

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

(3)known as duramen

(4)All of these

How many of the statements are  true for heartwood

(1)4

(2)5

(3)6

(4)3

Which one is true for sapwood

(1)It lies in the peripheral region of xylem

(2)It does conduction of water and minerals

(3)It is also called as alburnum

(4)All of the above