The spring wood is ...‘A’... in colour and has a ...‘B’... density, whereas the autumn wood is ...‘C’... in colour and has a ...‘D’... density. In above paragraph, A, B, C and D are respectively.

Options

A. Lighter, lower, darker, higher
B. Lighter, higher, darker, lower
C. Darker, lower, lighter, higher
D. Darker, higher, lighter, lower

Answer

To answer the question regarding the characteristics of spring wood and autumn wood, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Identify the Color of Spring Wood**:
- Spring wood is formed during the spring season when the cambial activity is at its peak. This results in larger xylem vessels and a lighter color.
- **Answer for A**: Lighter

2. **Determine the Density of Spring Wood**:
- Due to the larger xylem vessels and more abundant growth, the density of spring wood is lower.
- **Answer for B**: Lower

3. **Identify the Color of Autumn Wood**:
- Autumn wood is formed during the autumn season when cambial activity decreases. This results in smaller xylem vessels and a darker color.
- **Answer for C**: Darker

4. **Determine the Density of Autumn Wood**:
- Since the xylem vessels are smaller and less abundant in autumn wood, its density is higher.
- **Answer for D**: Higher

### Final Answers:
- A: Lighter
- B: Lower
- C: Darker
- D: Higher