Each annual ring (growth ring) consists of

Options

A. Sapwood + Latewood
B. Heart wood + Early wood
C. Spring wood + Autumn wood
D. Heart wood + Sap wood

Answer

To answer the question "Each annual ring (growth ring) consists of," we can break down the process into several steps:

### Step-by-Step Solution:

1. **Understanding the Structure of a Tree**:
- A tree has different parts, including the pith at the center, surrounded by wood layers. The outer layers are known as sapwood and heartwood.

2. **Identifying the Types of Wood**:
- The sapwood is further divided into two types of wood based on the time of formation during the growing season: early wood and late wood.

3. **Defining Early Wood and Late Wood**:
- **Early Wood**: This is the wood that forms in the early part of the growing season (spring). It is typically lighter and less dense.
- **Late Wood**: This wood forms later in the growing season (autumn) and is usually denser and darker.

4. **Formation of Annual Rings**:
- Each annual ring, also known as a growth ring, is formed by the combination of early wood and late wood.
- As the seasons change, a new layer of wood is added each year, resulting in a distinct ring that represents one year of growth.

5. **Conclusion**:
- Therefore, each annual ring consists of **spring wood (early wood)** and **autumn wood (late wood)**.

### Final Answer:
Each annual ring (growth ring) consists of spring wood and autumn wood.

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