As plants grow older, the outer protective tissue undergoes certain changes. A layer of secondary meristem develops which is called as phellogen. It is also known as cork cambium. It replaces epidermis of stem and roots.
Question
Write a short note on phellogen’.
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Give reasons Meristematic cells have a prominent nucleus and dense cytoplasm but they lack vacuole, (b) Intercellular spaces are absent in sclerenchymatous tissues. (c) We get a crunchy and granular feeling when we chew pear fruit. (d) Branches of a tree move and bend freely in high wind velocity. (e) It is difficult to pull out the husk of a coconut tree.
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