Question

Secondary cortex is also known as______.

• A. Bark.
• B. Phellem
• C. Phellogen
• D. Phelloderm.

Answer 1

The correct option is D

Phelloderm.

The correct option is D.

The explanation for the correct option:

1. Phelloderm is a type of periderm made up of cells formed inwardly by the cork cambium.
2. It is a type of living tissue with a cellulosic cell wall.
3. The secondary cortex is another name for the phelloderm.
4. Angiosperm phelloderm cells have thin walls.
5. Depending on the plant, the phelloderm can be a single layer or a multilayer of cells.
6. Hence, the phelloderm is known as the secondary cortex.

The explanation for the incorrect options:

Option A:

1. Bark has both living and non-living tissue.
2. Bark refers to all of the tissues of the stem.
3. It exists outside of the vascular cambium.

Option B:

1. Phellem and cork are compactly arranged and begin with a thin cellulosic cell.
2. As they mature, they lose living matter.
3. Their cell becomes thicker.
4. It protects the stem's interior.

Option C:

1. Cork cambium is another name for phellogen.
2. It is a ring of meristematic tissue.
3. It is formed in the dicotyledonous stem during the secondary growth process.
4. Cork is produced on the periphery, while the secondary cortex is produced on the inner side.

Final answer: Secondary cortex is also known as phelloderm.