Question

which statement is correct .........​

Answer 1

I think (3) is correct

Answer 2

Answer:

Option 3) to demonstrate that the tip of the coleoptile is the source of auxin.

Explanation:

The arrows indicate the direction of  the light.Since we know that Charles Darwin and his son Francis Darwin observed that the coleoptiles of the canary grass responded to unilateral illumination which lead to grow towards the source of the light  which is known as photoperiodism.

Auxin was isolated from the tips of the coleoptiles of oat seedlings.