Uses of Microorganisms

Q.

Question 6
Name the microorganisms which can fix atmospheric nitrogen in the soil.

Q.

The antibiotic penicillin is obtained from

1. Bacteria

2. Fungus

3. Virus

4. Protozoan

Q.

What is pasteurisation.

Q.

What is the principle of fermentation?

Q.

Where are the nitrogen-fixing bacteria found in leguminous plants?

Q. Question 5
The gas released during the preparation of bread is

(a) oxygen
(b) carbon dioxide
(c) nitrogen
(d) sulphur dioxide

Q.

How is fermentation used in industry?

Q.

Name the natural source of Acetic acid.

Q.

Description of the process of curd making

Q. Who discovered the antibiotic known as 'Tetracycline'?

1. Dr. Jonas Salk
2. Dr. Albert Sabin
3. Dr. Alexander Flemming
4. Dr. Yellapreggada Subba Rao

Q.

Which bacteria helps in fermentation?

Q. The process of fermentation includes the formation of curd by bacteria.

1. False
2. True

Q.

Choose a unicellular organism from the following

a.Lactobacilli

b.Yeast

c.Spirogyra

d. Mushroom

1. a

2. a and b

3. c and b

4. c and d

Q. Which of the following causes food poisoning?

1. Clostridium botulinum
2. Bacillus thuringiensis
3. Thiomargarita namibiensis
4. Lactobacillus

Q. Who among the following scientists discovered oral polio vaccine?

1. Louis Pasteur
2. Alexander Fleming
3. Albert Sabin
4. Edward Jenner

Q. Which organism(s) play an important role in the nitrogen cycle?

1. Rhizobium
2. Nostoc
3. Anabena
4. Plasmodium

Q. What are the two harmful effects of microorganisms?

Q. Pasteurization of milk ensures the killing of disease-producing organisms present in milk.

1. True
2. False

Q.

Which of the following is involved in nitrogen fixation in leguminous plants?

1. Eubacteria

2. Rhizobium

3. Archaebacteria
4. Lactobacillus

Q. _______ inhibits growth of microorganisms.

1. Antibodies
2. Antibiotics
3. Antigens
4. Vaccines

Q. X is a bacterium that lives symbiotically in the root nodules of a plant 'Y' and fulfils the nitrogen requirements of the plant 'Y' while obtaining nutrition from it. Identify X and Y.

1. Rhizobium, pea
2. Rhizobium, rice
3. Nitrosomonas, pea
4. Nitrosomonas, rice

Q. The first antibiotic discovered by Alexander Fleming was ______.

1. Erythromycin
2. Macrolide
3. Penicillin
4. Quinolone

Q. What causes food poisoning?

Q. Identify the antibiotic(s) from the following.

1. Tetracycline
2. Streptomycin
3. Erythromycin
4. Penicillin

Q. The bacterium which is used as a biopesticide is _______.

1. Thiomargarita namibiensis
2. Bacillus thuringiensis
3. Rhizobium
4. Lactobacillus

Q.

What results in dough formation when atta or maida is mixed with yeast?

1. Nitrogen gas released during respiration of yeast
2. Carbon dioxide gas released during respiration of yeast
3. Water vapour released during respiration of yeast
4. None of these

Q.

Who discovered the fermentation process?

Q. Name 2 Fungi causing food poisoning?

Q. During the baking process of cakes, yeast produces ______ gas.

1. nitrogen
2. carbon dioxide
3. oxygen
4. hydrogen

Q.

Question 9
What are antibiotics? What precautions must be taken while taking antibiotics?