Question

A plant always bends towards light. This is due to the action of a hormone called _____ and its found at _______.

• A. gibberellins , end of shoots
• B. auxin , shady parts of shoot
• C. auxin , tip of the leaves
• D. gibberellins , tip of the shoot

Answer 1

The correct option is B auxin , shady parts of shoot

When growing plants detect light, a hormone called auxin, synthesised at the shoot tip, helps the cells to grow longer. When light is coming from one side of the plant, auxin diffuses towards the shady side of the shoot. This concentration of auxin stimulates the cells to grow longer on the side of the shoot which is away from light. Thus, the plant appears to bend towards light.