Auxin and the bending of a shoot towards light

The same question, asked 3 times: 2023*, 2024*, 2025. Every wording below, oldest first.

Try each one first, then open its answer.

Question 1
2023
21 $Name a plant hormone responsible for bending of a shoot of a plant when it is exposed to unidirectional light. How does it promote phototropism ?$
Question 2
2023
21 $A plant hormone helps in bending of stem towards light. Name the hormone and explain how is the movement achieved.$
Question 3
2024
22 $Where are auxins synthesized ? How do they promote phototropism ?$
Question 4
2024
29 $Name a plant growth hormone synthesized at the shoot tip. Explain its effect on the growth of a plant in response to light.$
Question 5
2025
9 $The plant hormone whose concentration stimulates the cells to grow longer on the side of the shoot which is away from light is :$
Tap an option to check your answer.

Question 1