Question

Charles and Francis Darwin concluded from their experiments on phototropism by grass seedlings that the part of the seedling that detects the direction of light is the______.

a.tip of the coleoptile.
b.Part of the coleoptile that bends during the response.
c.Base of the coleoptile.
d.Cotyledon.
e.Photochromic in the leaves.

Answer 1

The correct answer will be option-A

Step-by-step 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.