How is the study of plant anatomy useful to us?

Explanation

### Step-by-Step Solution:

1. **Understanding Plant Structure**: The study of plant anatomy provides insights into the internal structure of plants. By examining the various tissues and cells, we can understand how different plants are built and how they function. This knowledge is essential for identifying commercially important plants such as jute and flax.

2. **Determining Tree Age**: Plant anatomy can be used to determine the age of trees. By studying the growth rings in the wood, which are formed due to seasonal growth patterns, we can estimate how old a tree is. This is particularly useful in forestry and ecological studies.

3. **Identifying Unknown Plant Samples**: The anatomical features of plants can help in identifying unknown plant samples. By examining the specific structures, such as leaf arrangement, stem type, and root systems, we can classify and identify plants that are not easily recognizable.

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