Question

The type of fermentation observed in yeasts is
A. Acrylic fermentation
B. Lactic acid fermentation
C. Pyruvic fermentation
D. Alcoholic fermentation

Answer 1

Hint:
Fermentation is the process of breaking down glucose in the absence of oxygen to produce energy in bacterial and yeast cells. In the fermentation of sugar, the end products include carbon dioxide, ethanol, and some aromatic compounds.

Complete answer:
Glucose can be used to generate chemical energy in two ways: either in the presence of oxygen or in its absence. When energy is released in the presence of oxygen it is said to be cellular respiration as in humans and when energy is released in the absence of oxygen it is said to be fermentation as in yeast.
When fermentation takes place due to acrylic acid, it is said to be acrylic fermentation. Acrylic acid plays a major role in the production of fermentative products on a large scale.
Lactic acid fermentation takes place in some bacteria and animals. During lactic acid fermentation, the six-carbon glucose is broken down into lactic acid in the absence of oxygen.
Pyruvic fermentation is the process during which the glucose is broken down into a three-carbon molecule of pyruvate and releases some energy. It takes place in the cytoplasm of all prokaryotic and eukaryotic organisms.
Alcoholic fermentation is the biological process where glucose is broken down to generate chemical energy and produce ethanol and carbon dioxide as by-products. Yeast and some bacteria carry out alcoholic fermentation.
Thus, the correct answer is:- Alcoholic fermentation.

Option ‘D’ is correct

Note:
The first step of alcoholic fermentation is that the sugars are converted into a three-carbon-containing molecule of pyruvate in the cytoplasm. Later, pyruvate is converted into ethanol and carbon dioxide releasing the energy of 2 ATP.