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The cork cambium, cork and secondary cortex are collectively called:

1. phelloderm
2. phellogen
3. periderm
4. phellem

Correct answer: periderm

Solution

The cork cambium (phellogen), cork (phellem), and secondary cortex (phelloderm) together make up the periderm. Periderm replaces the epidermis in stems and roots undergoing secondary growth.

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