Answer:
The correct answer will be option-A
Explanation:
Phototropism is the set of the physiological and morphological response of plants to light.
The earliest experiment on the concept of phototropism was performed by Charles and Francis Darwin. They collected and grew the grass seedlings and found that the light was detected by the tip of the coleoptile but the response of bending towards the light was observed is the region of elongation.
This shows that the tip of the coleoptile is the correct answer.
