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) base of the coleoptile. B) part of the coleoptile that bends during the response. C) cotyledon. D) tip of the coleoptile.

Which part of the coleoptile is responsible for phototropism can be derived from empiric data by preventing some parts of the coleoptile to recieve light. In this case preventing the tip of coleoptile prevents photostrism movement so correct answer is D (see figures).

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shivjimishraVT shivjimishraVT · Answer 2 · 2022-03-23T07:26:20+01:00

The part of the seedling that detects the direction of light is the tip of the coleoptile. So, the correct answer is D.

What do you mean by Phototropism?

Phototropism may be defined as the growth of an organism in response to light stimulus. It is most commonly seen in plants.

The conclusion of this experiment indicates that the tip of the coleoptile bends towards the direction of light. The cells of the opposite side of light expand and divide more rapidly, as compared to the side of light direction. This causes the tip of the coleoptile bends towards the light source.

Therefore, the part of the seedling that detects the direction of light is the tip of the coleoptile.

To learn more about Phototropism experiments, refer to the link:

https://brainly.com/question/22499730