Assertion : Secondary growth usually occurs in dicotyledonous stems.\ Reason : The vascular cambium

Question

Assertion : Secondary growth usually occurs in dicotyledonous stems.\ Reason : The vascular cambium present between xylem and phloem possesses the ability to form secondary xylem and secondary phloem respectively.\

Professor PC Thomas Classes · Answer

(a) : Dicotyledonous stems usually show secondary growth in thickness, which is due to the activity of vascular cambium and cork cambium. Vascular cambium is present between phloem and xylem. Such vascular bundles because of the presence of cambium possess the ability to form secondary xylem and phloem tissues, and hence exhibit secondary growth.