Which site accounts for about 90% of transpiration in plants?

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Transpiration**: Transpiration is the process by which water vapor is lost from the plant to the atmosphere, primarily through small openings in the leaves.

2. **Identifying the Main Site of Transpiration**: The question asks for the site that accounts for about 90% of transpiration in plants. The primary site for this process is the stomata.

3. **Role of Stomata**: Stomata are specialized pores located mainly on the leaves of plants. They facilitate gas exchange (such as oxygen and carbon dioxide) and are crucial for transpiration.

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