How does phototropism occur in plants ?

Phototropism in plants is like their way of “following the sun.” It’s a cool way plants respond to light. Here’s how it happens:

1. Light Perception: Plants have special light-sensitive molecules called photoreceptors. One type, called “phytochromes,” play a big role in phototropism. These molecules detect the direction, intensity, and even color of light.
2. Growth Hormone Movement: When light hits one side of the plant more than the other, the phytochromes signal the plant to move its growth hormone, called auxin, to the darker side.
3. Uneven Growth: Auxin encourages cells to grow longer. So, when more auxin moves to the darker side, those cells grow longer. This makes that side of the plant curve towards the light, like a sunflower turning its face to the sun.
4. Bending and Response: This bending movement is phototropism in action. The plant literally “bends” towards the light. It’s nature’s way of making sure plants get the best light for photosynthesis.

In simple terms, phototropism is a clever survival strategy that helps plants make the most of sunlight for energy. It’s like plants’ natural way of chasing the light for their food !