Role

Question 1

What role do bacteria play in food production?

Answer 1

Bacteria help in making different food products such as curd and cheese.

Lactobacilli bacteria convert carbohydrates in milk into lactic acid, aiding in curd formation.

Question 2

What is the process of making curd with bacteria?

Answer 2

Curd is made by adding a small amount of curd to warm milk and allowing it to sit at room temperature.

The lactic acid creates an acidic condition that brings proteins in the milk together, forming thick curd.

Question 3

What is the role of yeast in bread preparation?

Answer 3

Yeast is used in the preparation of bread, cakes, dosa, and alcohol by converting sugar into carbon dioxide and alcohol during fermentation.

This process causes the dough to rise due to trapped gas bubbles.

Question 4

What happens to the dough as it is baked?

Answer 4

The yeast is killed, alcohol evaporates, and gas bubbles escape, making the bread fluffy.

This results in the light texture of baked bread compared to denser items like chapatis.

Question 5

What are the two steps involved in vinegar production?

Answer 5

1. Fermentation of food items like grapes with yeast to obtain alcohol.
2. Addition of bacteria to alcohol, converting it into acetic acid (vinegar).

This illustrates the combined roles of yeast and bacteria in food processing.

Question 6

What conditions lead to food spoilage?

Answer 6

Food spoilage occurs under conditions of:
* Darkness
* Exposure to oxygen
* High temperature
* Presence of moisture
* Availability of nutrients for microorganisms.

These factors create an environment conducive for microbial growth.

Question 7

What is food poisoning?

Answer 7

Food poisoning results from consuming spoiled food and can cause stomach pain, mild fever, vomiting, and diarrhea.

It highlights the health risks associated with improper food handling and spoilage.

Question 8

Fill in the blank: Alcohol + Carbon dioxide + _______ = Acetic acid.

Answer 8

Sugar

This equation summarizes the fermentation process leading to vinegar production.

Question 9

True or False: Yeast is a type of bacteria.

Answer 9

False

Yeast is a fungus, while bacteria are prokaryotic microorganisms.

Question 10

What is the role of microorganisms in food spoilage?

Answer 10

Microorganisms can cause food to spoil and rot, leading to food poisoning if consumed.

Their metabolic activities break down food, resulting in off-flavors and textures.

Question 11

What are some food items that can be fermented to produce alcohol?

Answer 11

Food items include:
* Barley
* Wheat
* Grape juice.

These ingredients are essential for the fermentation process that produces alcoholic beverages.