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Direct elongation of the radicle leads t...

Direct elongation of the radicle leads to the formation of_____root.

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### Step-by-Step Solution: 1. **Understanding the Question**: The question asks about the type of root formed due to the direct elongation of the radicle. 2. **Identifying the Radicle**: The radicle is the part of the plant embryo that develops into the primary root. It is the first part of the seedling to emerge during germination. 3. **Defining Direct Elongation**: Direct elongation refers to the straight growth of the radicle downwards into the soil, which is crucial for establishing the root system. 4. **Formation of Roots**: When the radicle elongates directly, it develops into the primary root. This primary root is the main root that grows directly from the seed. 5. **Understanding Root Types**: - The primary root is the first root that emerges and is typically thicker and longer. - Secondary roots can develop from the primary root later on, but they are not formed directly from the radicle. 6. **Final Answer**: Therefore, the direct elongation of the radicle leads to the formation of the **primary root**.
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