The immediate cause of riots in Paris during the French Revolution was the high prices of bread.

Explanation:

During the 18th century, France was facing economic difficulties due to wars, lavish spending by the royal family, and poor harvests. This led to an increase in the price of bread, which was the staple food of the common people. The peasants and urban poor, who were already struggling to make ends meet, found it difficult to afford the high prices of bread.

As the situation worsened, the government tried to control the prices of bread by imposing regulations on the bakers and fixing the maximum price of bread. However, this did not solve the problem.

In July 1789, the situation reached a boiling point when the government announced a new tax on the people. This tax was seen as unfair and oppressive by the common people, who were already burdened with high prices of bread. The news of the tax sparked riots in Paris, as people took to the streets to protest.

The riots quickly turned violent, as the angry mob attacked symbols of authority and power, such as the Bastille prison. The storming of the Bastille became a symbol of the people's revolt against the oppressive monarchy.

Conclusion:

Thus, the high prices of bread were the immediate cause of riots in Paris during the French Revolution. The riots led to the downfall of the monarchy and the beginning of a new era in French history.