Phloem is a complex tissue for ______ of organic substances.

Explanation

**Step-by-Step Solution:**

1. **Understanding Phloem**: Phloem is a type of complex tissue found in vascular plants, including angiosperms, gymnosperms, and pteridophytes.

2. **Function of Phloem**: The primary function of phloem is to transport organic substances, particularly food produced during photosynthesis.

3. **Process of Transport**: The process by which phloem transports food is known as translocation. This process begins in the leaves, where photosynthesis occurs, and then the food is distributed to various parts of the plant.

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