First slide

Secondary Growth

Question

The tissue that will be present in the maximum amount in the stem of a many years old woody tree is

Easy

A

Secondary xylem
B

Secondary cortex
C

Primary xylem
D

Primary phloem

Solution

The cambial ring becomes active and begins to cut off new cells, both towards the inner and the outer sides. The cells cut off towards pith, mature into secondary xylem and the cells cut off towards periphery mature into secondary phloem. The cambium is generally more active on the inner side than on the outer. As a result, the amount of secondary xylem produced is more than secondary phloem and soon forms a compact mass. Therefore secondary xylem is present in maximum in the stem of many year old woody tree.

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