Question

You may have observed plants rotate towards a light source, thereby increasing the plant's ability to intercept light energy and increase photosynthesis. You, however, are given the task of preventing grass seedlings from rotating toward the light. Using your knowledge of phototropism, which of the following experimental procedures would you use to complete your task?

Answer 1

The correct answer would be- covering the tip of the grass seedling with the help of black paper.

Step-by-step explanation:

Movement or the rotation of the plant in response to the sunlight or other light stimulus is termed as phototropism. It occurs due to the presence of the chemical auxin located in the farthest cells from the light source.

Covering the tip of the grass seedling with the black paper leads to block the interaction between the light and the auxin that leads to the growth or movement of the plant towards the light.

Thus, the correct answer is - covering the tip of the grass seedling with the help of black paper.