Microbes in Human Welfare Test

Result

Microbes in Human Welfare Test - 32

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Weekly Quiz Competition

Question 1
1 / -0

The biofertilizer present in the roots of legumes is

A
Anabaena

B
Rhizobium

C
Azospirillum

D
All of the above

Solution

Rhizobium is one of the most important bacteria which are involved in the symbiotic association. They form a mutual association with the roots of the leguminous plants. This bacterium forms nodules in the cortical cells of the roots. They perform nitrogen fixation with the help of the enzyme nitrogenase. They are commonly used as biofertilizers because the activity of nitrogen fixation causes an increase in the yield of the legume plants.
Thus, the correct answer is option B.
Question 2
1 / -0

Which of the following is a pair of biofertilizer?

A
Azolla and BGA

B
Nostoc and legume

C
Rhizobium and grasses

D
Salmonella and E. coli

Solution

A biofertilizer is a substance, which contains living microorganisms, when applied to seeds, plant surfaces, or soil, colonizes the rhizosphere or the interior of the plant and promotes growth by increasing the supply or availability of primary nutrients to the host plant. For example, Azolla and blue-green algae (BGA).
So, the correct answer is option A.
Question 3
1 / -0

Rishikesh is famous for the production of _______________.

A
Antibiotics

B
Heavy electricals

C
Fertilizers

D
Transistorized radios

Solution

Answer is option A i.e. "Antibiotics"
Rishikesh is famous for the production of Antibiotics. IDPL (Indian Drugs and Pharmaceuticals Ltd.) is situated in Rishikesh which mainly manufactures various types of antibiotics. The Rishikesh plant was commissioned in 1967 and has a largest antibiotics fermentation facility
Question 4
1 / -0

A common biocontrol agent for the control of plant disease is

A
Bacillus thuringiensis

B
Glomus

C
Trichoderma

D
Both A and C

Solution

Trichoderma is a genus of fungi that is present in all soils, where they are the most prevalent cultural fungi. Several strains of Trichoderma have been developed as biocontrol agents against fungal diseases of plants. Bacillus thuringiensis is used as a biopesticide to eradicate bollworm disease in crops.
Therefore, the correct answer is option D.
Question 5
1 / -0

Rhizobium is a __________

A
Nitrogen indicator

B
Nitrogen fixer

C
Nitrogen fetcher

D
All of the above

Solution

Rhizobium has a symbiotic association with leguminous plants. They live in their root nodules and convert nitrogen into usable Nitrogen compounds.
Question 6
1 / -0

Microorganisms involved in curd formation is

A
$$Rhizopus$$

B
$$Lactobacillus$$

C
Smut

D
Rust

Solution

Lactobacillus belongs to the group of bacteria which perform fermentation and convert the sugars into lactic acid in the absence of oxygen. This bacterium can also be added to the milk in the form of already synthesized curd. Lactose is the disaccharide sugar present in the milk that gets converted to lactic acid. The lactic acid which is produced gives a sour taste and the milk is converted to curd.
Thus, the correct answer is option B.
Question 7
1 / -0

Match the following
i) Rhizopus a) Malaria
ii) Lactobacillus b) Idli, Dosa
iii) Yeast c) Curd formation
iv) Protozoa d) Bread mould

A
I- c, II- d, III- a, IV- b

B
I- b, II- d, III- c, IV- a

C
I- a, II- b, III- c, IV- d

D
I- d, II- c, III- b, IV- a
Solution
- There are spores of Rhizopus are present in the atmosphere. The spores germinate when they obtain a favourable climate and substratum. In the presence of moisture and nutrients on the surface of bread, the spores germinate and form the hyphae. Thus, these fungi are commonly called as bread mould.
- Lactobacillus is the bacterium present in raw milk which performs fermentation. The bacterium converts the lactose sugar in the milk to lactic acid by the process of fermentation. Thus, the activity of the bacterium is responsible for curd formation.
- Yeast cells are added to the batter of idli and dosa. The cells perform anaerobic fermentation by utilizing the fermentable sugars and converting them to ethanol and carbon dioxide. The carbon dioxide gas makes the products soft, porous and fluffy.
- Protozoa known as Plasmodium is the organism which is responsible for causing malaria in humans. The organism grows in mosquitoes and are transmitted to humans while feeding on human blood.
Thus, the correct answer is option D.
Question 8
1 / -0

Yeast is used for the production of

A
Alcohol

B
Cake

C
Bread

D
All
Solution
- Yeast is a eukaryotic and single-celled fungus. The commonly used species of yeast is Saccharomyces cerevisiae. It is also known as baker's yeast.
- The yeast is used in the production of fermented products like cakes, bread, and alcohol.
- The organism converts the fermentable sugars present in the substrate into carbon dioxide and ethanol.
- The carbon dioxide gas makes the dough of bread and cake soft and fluffy. There are pores in the bread and cakes which is due to the carbon dioxide gas bubbles which get trapped during the process of baking.
Thus, the correct answer is option D.
Question 9
1 / -0

While preparing curd, a little curd is added to warm milk. Reason behind this is
a) Curd contains several microbes which promotes the formation of curd
b) Only Lactobacillus present in curd promotes curd formation in milk
c) Lactobacillus multiplies in milk and converts it into curd

A
a, b

B
b, c

C
a, c

D
All of the above
Solution
- Lactobacillus belongs to the group of bacteria which through fermentation converts the sugars into lactic acid in the absence of oxygen.
- This bacterium is added to the milk in the form of an already synthesized curd where they multiply and convert lactose sugar into lactic acid.
- The lactic acid which is produced gives a sour taste and the milk is converted to curd.
Thus, the correct answer is option B.
Question 10
1 / -0

Microorganisms involved in alcohol formation is:

A
Yeast

B
Rhizopus

C
Lactobacillus

D
None

Solution

Yeast is the eukaryotic and single-celled fungus. The commonly used species of yeast is Saccharomyces cerevisiae. It is also known as baker's yeast. The yeast is used in the production of fermented products like cakes, bread and alcohol. The organism converts the fermentable sugars present in the substrate into carbon dioxide and ethanol. These organisms are commercially used for beer, wine and production of other alcoholic beverages.
Thus, the correct answer is option A.

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i) Rhizopus	a) Malaria
ii) Lactobacillus	b) Idli, Dosa
iii) Yeast	c) Curd formation
iv) Protozoa	d) Bread mould

Microbes in Human Welfare Test - 32

Result

Microbes in Human Welfare Test - 32

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SHARING IS CARING

Question 1

Anabaena

Rhizobium

Azospirillum

All of the above

Solution

Question 2

Azolla and BGA

Nostoc and legume

Rhizobium and grasses

Salmonella and E. coli

Solution

Question 3

Antibiotics

Heavy electricals

Fertilizers

Transistorized radios

Solution

Question 4

Bacillus thuringiensis

Glomus

Trichoderma

Both A and C

Solution

Question 5

Nitrogen indicator

Nitrogen fixer

Nitrogen fetcher

All of the above

Solution

Question 6

$$Rhizopus$$

$$Lactobacillus$$

Smut

Rust

Solution

Question 7

I- c, II- d, III- a, IV- b

I- b, II- d, III- c, IV- a

I- a, II- b, III- c, IV- d

I- d, II- c, III- b, IV- a

Solution

Question 8

Alcohol

Cake

Bread

All

Solution

Question 9

a, b

b, c

a, c

All of the above

Solution

Question 10

Yeast

Rhizopus

Lactobacillus

None

Solution

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