In early wood, cells have ……….. diameters and ……. walls.

Options

A. small, thick
B. large, thick
C. small, thin
D. large, thin

Explanation

To answer the question "In early wood, cells have ……….. diameters and ……. walls," we need to understand the characteristics of early wood compared to late wood.

### Step-by-Step Solution:

1. **Understand the Types of Wood**: There are two main types of wood in trees: early wood (also known as spring wood) and late wood (also known as summer wood).

2. **Characteristics of Early Wood**: Early wood is formed during the spring when conditions are favorable for growth. It is characterized by:
- **Cell Diameter**: The cells in early wood have larger diameters. This is because the tree is growing rapidly and needs to transport more water and nutrients.
- **Cell Wall Thickness**: The walls of the cells in early wood are thinner. This allows for greater porosity and easier movement of water.

3. **Comparison with Late Wood**: In contrast, late wood forms during the summer when conditions are less favorable. Late wood has:
- **Cell Diameter**: Smaller diameters.
- **Cell Wall Thickness**: Thicker walls to provide strength and support as the tree matures and faces harsher conditions.

4. **Conclusion**: Based on the characteristics of early wood, we can conclude that in early wood, cells have **large diameters** and **thin walls**.

### Final Answer:
In early wood, cells have **large diameters** and **thin walls**.

---