Sulphur-di-oxide mixed in atmosphere gives more impact on

Concept:

• Sulphur-di-oxide is a water-soluble gas with a rotten egg odour.
• Sulphur-di-oxide is a highly oxidizing reducing agent.
• Its formula is SO₂.
• Sulphur dioxide is found in the earth's atmosphere at about 1ppm concentrations.

Explanation:

Sulphur-di-oxide effect on plants:

• Plants get affected by sulphur dioxide directly and indirectly.
• Directly it causes chronic effects. 
• Indirectly it disrupts photosynthesis because the opening of stomata is promoted by this gas which causes excessive water loss.

Mistake Points

• The question asks for the most impact of sulphur dioxide.
• Although sulphur dioxide has an impact on all of them it mostly impacts plants. 

Additional Information

Sulphur-di-oxide effect on the human body:

• Sulfur dioxide affects the human body by causing problems in the respiratory system mainly in lung function.
• It also irritates the eyes and causes mucus secretion, asthma, and bronchitis.

Sulphur-di-oxide effect on the physical resources:

• Sulphur dioxide formed sulphuric acid when it combines with water and air in the atmosphere.
• It is the main component of acid rain.
• This acid rain corrodes metal, and deteriorates stone, making the surface of buildings dirty.
• So, SO₂ left a harmful effect on physical resources.

Thus, sulphur-di-oxide mixed in the atmosphere has the most impact on plants.