Fermentation

Q.

Which of the following makes bread soft and fluffy?

1. Finely ground flour

2. Alcohol given off during fermentation of sugar

3. Carbon dioxide gas given off during fermentation of sugar

4. Oxygen gas

Q. Formation of curd from milk is an example of fermentation.

1. 
   True
2. 
   False

Q.

Alcohol can be converted into vinegar by the action of micro-organisms called:

(a) viruses (b) yeast (c) protozoa (d) bacteria

Q. How does bacteria involve in the making of pickles

Q.

Name one ectoparasite and endoparasite.

Q.

Mention the discoveries made by following scientists.
Louis Pasteur

Q.

(a) What is meant by fermentation ? Name the scientist who discoverd fermetation.

(b) Which micro-organisms help in cleaning the environment ?

Q. Yeast I widely used to make soft and fluffy cakes. Explain the science involved in this

Q.

What are bioreactors used for?

Q.

State whether the given statements is true or false: Anaerobic bacteria digest animal waste and produce biogas.

1. True
2. False

Q.

The micro-organism which is capable of converting sugar into alcohol and carbon dioxide is :

(a) bacterium (b) fungus (c) alga (d) protozoan

Q.

The process of conversion of sugar into alcohol is called :

(a) nitrogen fixation (b) moulding (c) fermentatin (d) infection

Q.

Question 2 (f)
The process of conversion of sugar into alcohol is called :

a) nitrogen fixation
b) moulding
c) fermentation
d) infection

Q.

The bread dough rises because of :

(a) heat (b) grinding (c) growth of yeast cells (d) kneading

Q.

Yeast reproduces rapidly and produces ___ and alcohol during fermentation.

Q. Question 2 (e)
The bread or idly dough rises because of

a) heat
b) grinding
c) kneading
d) growth of yeast cells

Q.

Yeast is used in the production of :

(a) sugar (b) alcohol (c) hydrochloric acid (d) oxygen

Q. Name the main conditions required for the growth of microorganisms.

Q. Question 2 (a)
Yeast is used in the production of :
a) Sugar
b) Alcohol
c) HCl
d) Oxygen

Q. Microorganisms help in the preparation of food items such as curd, bread, and cake.
Which microorganism helps in the conversion of milk into curd?

1. Bacterium
2. Protozoan
3. Virus
4. Fungus

Q.

Nivin was observing his mother making wine using grapes. He saw that she is adding some amount of yeast into it. What do you think, what will be the reason for using yeast?

Q. Formation of curd from milk is an example of fermentation.

1. 
   True
2. 
   False

Q. Question 02 (f)
The process of conversion of sugar into alcohol is called :

a) nitrogen fixation
b) moulding
c) fermentation
d) infection

Q.

How are microbes grown at the industrial level?

Q. Formation of curd from milk is an example of fermentation.

1. 
   False
2. 
   True

Q.

Yeast reproduces rapidly and produces ___ and alcohol during fermentation.

Q.

Mention one function of the following organ/structure/substance:

Fermentation

Q.

Can microorganisms survive in vacuum?

Q. ________________ acts on lactose present in milk to produce __________________.

1. Lactobacillus; lactic acid
2. Saccharomyces; water
3. Lactobacillus; ethanol
4. Saccharomyces; lactic acid

Q. Decomposition is the process by which complex organic substances are broken down into simple organic matter.

1. False
2. True