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The cotton-like threads formed on moist bread typically represent a mode of nutrition known as **saprotrophic nutrition** or **saprophytic nutrition**.
### Saprotrophic Nutrition:
1. **Definition:** Saprotrophic nutrition is a type of heterotrophic nutrition where organisms feed on dead and decaying organic matter.
2. **Process:** The cotton-like threads (often fungal hyphae) seen on moist bread are likely fungi such as mold. These fungi secrete digestive enzymes onto the bread, which break down complex organic compounds into simpler substances. The fungi then absorb these simpler substances (nutrients) directly through their hyphae.
3. **Function:** The fungi involved in saprotrophic nutrition play a crucial role in decomposing organic matter, recycling nutrients back into the ecosystem. This process is essential for nutrient cycling in nature.
4. **Example:** Common molds like Rhizopus or Penicillium are examples of fungi that exhibit saprotrophic nutrition. They are commonly found on bread, fruits, vegetables, and other organic materials.
Therefore, the cotton-like threads (fungi) formed on moist bread exhibit saprotrophic nutrition by decomposing the bread and absorbing nutrients from it.
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