select the correct pair

Options

A. spring wood - light colour, high density
B. Spring wood - dark colour, low density
C. autumn wood -light colour, high density
D. autumn wood - dark colour, high density.

Answer

To solve the question of selecting the correct pair regarding Spring Wood and Autumn Wood, we will analyze each option based on the definitions and characteristics of these types of wood.

### Step-by-Step Solution:

1. **Understanding Spring Wood**:
- Spring wood, also known as early wood, is formed during the spring season when secondary growth occurs in dicot stems.
- Characteristics:
- **Color**: Light
- **Density**: Low

2. **Understanding Autumn Wood**:
- Autumn wood, also known as late wood, is formed during the autumn season during secondary growth in dicot stems.
- Characteristics:
- **Color**: Dark
- **Density**: High

3. **Analyzing the Options**:
- **Option A**: Spring Wood - Light Color, High Density
- This is incorrect because spring wood is low in density.
- **Option B**: Spring Wood - Dark Color, Low Density
- This is incorrect because spring wood is light in color.
- **Option C**: Autumn Wood - Light Color, High Density
- This is incorrect because autumn wood is dark in color.
- **Option D**: Autumn Wood - Dark Color, High Density
- This is correct as autumn wood is indeed dark in color and high in density.

4. **Conclusion**:
- The correct pair is **Option D: Autumn Wood - Dark Color, High Density**.