Name the organism that is usually used to produce ethanol from plant material.

The organism that is usually used to produce ethanol from plant material is Saccharomyces cerevisiae, also known as Baker's yeast or Brewer's yeast.

Here are the steps:

1. Plant material, which is rich in cellulose, is collected. This could be corn, sugarcane, or even agricultural waste.

2. The plant material is then processed to break down the cellulose into simple sugars. This process is called hydrolysis.

3. The simple sugars are then fermented. This is where Saccharomyces cerevisiae comes in. The yeast consumes the sugars and produces ethanol and carbon dioxide as by-products.

4. The mixture is then distilled to separate the ethanol from the other by-products. The result is a high concentration of ethanol, which can be used as biofuel.