Here's why:
* Support: The stem provides structural support for the plant, allowing it to stand tall and reach for sunlight.
* Transport: The stem contains vascular tissue (xylem and phloem) that transport water and nutrients from the roots to the leaves and food (sugars) from the leaves to the rest of the plant.
* Phototropism: Plants exhibit phototropism, meaning they grow towards light. The stem is the part that bends and grows in response to light cues, ensuring the leaves receive maximum sunlight for photosynthesis.
While the roots anchor the plant, they don't contribute to the upward growth and movement towards the sun.
