Question

Annual rings are the number of:

• A. Internodes in a stem.
• B. Rings of vascular bundles in a monocot stem.
• C. Bark layers in a woody stem.
• D. Layers of Xylem in a stem.

Answer 1

The correct option is D

Layers of Xylem in a stem.

The correct option is D.

Explanation for the correct option:

1. The tree develops new cells, which are structured in yearly rings or annual growth rings, which are concentric circles.
2. The amount of wood generated in a single growing season is represented by these annual rings.
3. As the stem grows, the whole ring, known as the cambial ring, is produced.
4. The formation of secondary xylem and secondary phloem is aided by the Cambial Ring.

Explanation for the incorrect options:

Option A:

1. The existence of nodes and internodes distinguishes them from roots.
2. They aid in asexual reproduction and assist the plant in surviving a period of dormancy.

Option B:

1. Monocot stems have a circular form with lateral branches and are surrounded by a dermis layer.
2. It is mostly made up of rigid, structured, rectangular cells that are coated with cutin, a waxy substance.
3. A well-developed epidermis, hypodermis, ground tissue, and numerous distributed vascular bundles make up the interior structure of a monocot stem.

Option C:

1. The stems of woody plants are covered by the tree's bark, which is made up of dead cells.
2. The bark cells are unable to respire and build a hard protective coating surrounding the vascular cambium's secondary growths.

Final answer: Annual rings are the number of layers of Xylem in a stem.