Question

Hydrotropism : Response towards water Phototropism : ___________

Answer 1

response towards sunlight

Answer 2

Answer:  

Hydrotropism: Response towards the water. Phototropism: Response towards the light.

Explanation:  

Phototropism is the movement of plant or any other organelle towards the light. For example the bending of sunflower towards the sun. The mechanism is exhibited by a chemical known as auxin. This auxin elongates the cell that is most distal to the source of light.  

As a result, the height or the length of the plant marginally increases, therefore, bending the flower towards the source of light. This helps the plant in performing photosynthesis.