Which of these terms have been paired correctly ?
(a) Bark-Periderm
(b) Cork-Phellem
(c) Cork cambium - phelloderm
(d) Secondary cortex - phellogen

Options

A. Bark-Periderm
B. Cork-Phellem
C. Cork cambium - phelloderm
D. Secondary cortex - phellogen

Answer

To solve the question of which terms have been paired correctly, we need to analyze each option provided:

1. **Option (a): Bark - Periderm**
- Bark is not solely made up of periderm. It consists of three components: periderm, cortex, and phloem. Therefore, this pairing is incorrect.

2. **Option (b): Cork - Phellem**
- Cork is indeed known as phellem. This is a correct pairing. Cork (phellem) is the outer protective layer of the plant.

3. **Option (c): Cork cambium - Phelloderm**
- Cork cambium is not known as phelloderm; it is actually referred to as phellogen. Thus, this pairing is incorrect.

4. **Option (d): Secondary cortex - Phellogen**
- The secondary cortex is not referred to as phellogen; it is known as phelloderm. Therefore, this pairing is also incorrect.

After analyzing all the options, we find that the only correct pairing is:

**Correct Answer: (b) Cork - Phellem**