How ozone forms in the upper atmosphere and why its depletion matters

The same question, asked 4 times: 2022*, 2023*, 2024*, 2025. Every wording below, oldest first.

Try each one first, then open its answer.

Question 1
2022
7 (a) $What is ozone ? How is it formed in the upper layers of the Earth’s atmosphere ? How does ozone affect our ecosystem ?$
Question 2
2023
33 $How is ozone formed in the higher levels of the atmosphere ? “Damage to the ozone layer is a cause of concern.” Justify this statement.$
Question 3
2024
33 (B) $A gas ‘X’ which is a deadly poison is found at the higher levels of atmosphere and performs an essential function. Name the gas and write the function performed by this gas in the atmosphere. Which chemical is linked to the decrease in the level of this gas? What measures have been taken by an international organization to check the depletion of the layer containing this gas?$
Question 4
2025
33 $Write the essential function performed by ozone at the higher levels of the atmosphere. How is it formed in the upper atmosphere ? Write the name of the group of chemicals mainly responsible for the depletion of ozone layer.$
Question 5
2025
21 $A gas ‘X’ is found in the upper layer of atmosphere. It is a deadly poison, but still essential for all life forms on earth. (a) Identify the gas and state the main factor for its depletion in the atmosphere. (b) How is this gas formed in the upper atmosphere ?$

Question 1