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Solution


Q.

Secondary xylem and phloem in dicot stem are produced by                       [2018]
1 apical meristems  
2 vascular cambium  
3 phellogen  
4 axillary meristems  

Ans.

(2)

Vascular cambium is a type of lateral meristem that produces secondary tissues (xylem and phloem) during secondary growth. It is produced by two types of meristem: intrafascicular cambium (primary meristem occurring as a strip in vascular bundles) and interfascicular cambium (secondary meristem which develops from permanent cells of medullary rays which occur at the level of intrafascicular strips). The cells of vascular cambium are of two types: fusiform initials, which produce secondary xylem towards the outside and secondary phloem towards the inner side, and ray initials, which give rise to vascular rays.