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

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

Secondary growth in extra stelar region is due to

Cork cambium gives rise
1.cork
2.phelloderm
3.phellem
4.All of the above

Periderm comprises of
1.Phellem
2.phellogen
3.phelloderm
4.All of these

Which one is true for phellogen
1.thick layer cells
2.narrow, thin walled and nearly rectangular cells
3.gives rise to phellem and phelloderm
4.All of the above