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A leaf is a flattened, usually green, lateral outgrowth of a plant's stem that is attached to the plant at its base. Leaves are the primary sites for photosynthesis, the process by which plants convert sunlight into chemical energy to fuel their growth.
Key features of leaves include:
1. **Blade:** The broad, flat part of the leaf that captures sunlight.
2. **Petiole:** The stalk that connects the leaf to the stem.
3. **Veins:** Vascular tissues within the leaf that transport water, nutrients, and sugars.
4. **Cuticle:** A waxy layer on the leaf's surface that helps reduce water loss.
5. **Stomata:** Small pores on the leaf surface that facilitate gas exchange, allowing carbon dioxide to enter and oxygen to exit.
Leaves play a crucial role in a plant's life, serving as the primary organs for photosynthesis and helping regulate water balance. They come in various shapes and sizes depending on the plant species and its environmental adaptations.
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