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Which of the following is made up of dead cells?

1. Collenchyma
2. Phellem
3. Phloem
4. Xylem parenchyma

Correct answer: Phellem

Solution

Phellem is cork, a protective tissue made of dead, suberized cells. Collenchyma, phloem, and xylem parenchyma are living tissues, so they do not fit.

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