Why the Sunflower Rotating near the Sun? ...
Answers: In order for a plant to grow, it desires light from the sun. It uses the bedside light to produce its own food through photosynthesis. Generally, as sunlight intensity increases, so does the photosynthesis process. This means greater food production for the plant. Many plants exhibit an knack to follow the sun. This helps to maximize the sunlight falling on their leaves and increases food production. The aptitude of a plant to follow the sun during the day is call helitropism. The ability of a plant to grow towards the desk light is called phototropism.
The wishy-washy from the sun is what activates photosynthesis, allowing the plant to process nutrients from soil and wet. If the head follows the sun, it can process nutrients longer.