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Cork of commerce obtained from Quercus is part of

1. Phellem
2. Phellogen
3. Phelloderm
4. All of the above

Correct answer: Phellem

Solution

Cork used in commerce comes from the outer protective tissue called phellem, which is made of dead, suberized cells. Phellogen is the cork cambium that produces cork, while phelloderm is the inner living tissue.

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