Hi my friends good day all of you!
The sunflower (Helianthus annuus) is an annual plant in the family Asteraceae, native to the Americas. It has a large flower head, typically yellow or orange in color, that follows the sun's movement across the sky. Sunflowers are known for their tall, sturdy stems and large, circular heads that can reach up to 12 inches (30 cm) in diameter. They are popular as ornamental plants and also grown for their oil and seeds, which are used for food and birdseed. Sunflowers are easy to grow and can be planted in a variety of soil types. They are also known to be drought-tolerant, and can grow in full sun.
Sunflowers have a mechanism called heliotropism, which allows them to track the movement of the sun across the sky by rotating their stems and flowers. This helps them to maximize their exposure to sunlight, which is essential for photosynthesis. The mechanism is controlled by the hormone auxin, which is produced in the stem and is responsible for the movement of the sunflower. As the sun moves across the sky, the auxin concentration is redistributed, causing the stem to bend and the flower to follow the sun