Question

1) which hormone is responsible for the phenomenon shown in the picture ?
2) which side of the shoot may have grown more and why ? ​

Answer 1

Answer:

Auxin is the hormone responsible and the side of the shoot with no light will grow more.

Explanation:

Auxin distributions are responsible for phototropic responses—i.e., the growth of plant parts such as shoot tips and leaves toward the light. In certain cases, auxin may be destroyed on the illuminated side, and the unilluminated side with more auxin elongates, causing the shoot to bend toward the light. Also, auxin is in the same concentration on both sides of the shoots, so they grow evenly and longer on both sides. One side of the tips is in more light than the other side.

    - reference is from britannica & bbc.co.uk

Hope it helps!