This structure provides support and protection for plant cells.

The cell structure that is been described in the question is CELL WALL.

Explanation:

The cell wall is one of the cell organelles that are found only in plant cells. Plant cell walls are made up of a polysaccharide called cellulose. The cellulose gives rigidity to the plant cell wall and enhances its ability to provide structural support for plant cells. The plant cell wall also serves as a barricade that protect the cell from invasion by foreign bodies.  

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sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.