Secondary growth is because of

1. vascular cambium

2. cork cambium

3. lateral meristem

4. All of the above

Interfascicular cambium is formed from

(1)medullary rays

(2)intrafascicular cambium

(3)cork cambium

(4)pericycle

Vascular cambium includes

(1)only intrafascicular cambium

(2)only interfascicular cambium

(3)Both intrafascicular and interfascicular cambium

(4)cork cambium

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

(1)secondary xylem, secondary phloem

(2)bast, wood

(3)wood, bast

(4)Both A and C

The secondary xylem is produced more because

(1)cambium is more active towards the inner side

(2)cambium is more active towards the outer side

(3)xylem is more important than phloem

(4)All of the above

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