Microbes in Human Welfare Test

Question 1
1 / -0

Which of the following is not a biofertilizer?

A
Azolla - Anabaena symbiosis

B
Mycorrhiza

C
Legume-Rhizobium symbiosis

D
Algae-fungi symbiosis

Question 2
1 / -0

Bio gas production from waste biomass with the help of methanogenic bacteria is a

A
Four step process.

B
One step process.

C
Two step process.

D
Three step process.

Question 3
1 / -0

Refer the given passage and answer the following questions.

At present the primary nutrient which limits the agricultural yield is nitrogen (N). Some plants are capable to produce more$${ N_2}$$ than they consume. These plants show symbioticz relationship with $${N_2}$$-fixing bacteria such as Rhizobium. These bacteria produce root nodules in leguminous plants and convert atmospheric $${N_2}$$ into nitrogenous compounds. Rhizobium bacteria are gram negative bacteria, which show host specificity and fix $${N_2}$$ in the presence of a red pigment called leghaemoglobin. It protects nitrogen fixing enzyme nitrogenase from oxygen.

Which of the following statements is incorrect?

A
Leghaemoglobin functions as oxygen scavenger during $${N_2}$$ -fixation.

B
Enzyme nitrogenase, which is required to fix atmospheric $${N_2}$$, is active in the presence as well as absence of oxygen.

C
N, P and K are referred to as critical elements for crop plants as they easily become deficient in soil due to higher plant requirement and repeated cultivation.

D
The coordinated activities of the legume and Rhizobium bacteria depend on chemical interactions between the symbiotic partners.

Question 4
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Refer the given passage and answer the following questions

At present, the primary nutrient which limits the agricultural yield is nitrogen (N). Some plants are capable to produce more$${ N_2}$$ than they consume. These plants show a symbiotic relationship with $${N_2}$$-fixing bacteria such as Rhizobium. These bacteria produce root nodules in leguminous plants and convert atmospheric $${N_2}$$ into nitrogenous compounds. Rhizobium bacteria are gram-negative bacteria, which show host specificity and fix $${N_2}$$ in the presence of a red pigment called leghaemoglobin. It protects nitrogen-fixing enzyme nitrogenase from oxygen.

Read the given statements and select the correct answer.

Statement 1: Rhizobium bacteria can also live freely in the soil and carry out $${N_2}$$-fixation by themselves.
Statement 2: Such Rhizobium bacteria are called free-living $${N_2}$$-fixing bacteria.

A
Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

B
Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1

C
Statement 1 is true and statement 2 is false.

D
Both statements 1 and 2 are false.

Question 5
1 / -0

A free living nitrogen-fixing cyanobacterium, which can also form symbiotic association with the water fern Azolla is

A
Anabaena

B
Tolypothrix

C
Chlorella

D
Nostoc

Question 6
1 / -0

Which of the following is used as a biofertilizer for the cultivation of soybean crop?

A
Azotobacter

B
Azospirillum

C
Rhizobium

D
Nostoc

Question 7
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Which of the following is a symbiotic nitrogen fixer?

A
Nostoc

B
Glomus

C
Azotobacter

D
Frankia

Question 8
1 / -0

Which of the following is the pair of biofertilizers for nitrogen fixation?

A
Azolla and blue green algae

B
Nostoc and legume

C
Rhizobium and grasses

D
Salmonella and E. coli

Question 9
1 / -0

Modern farmers can increase the yield of paddy upto 50% by the use of

A
Cyanobacteria

B
Rhizobium

C
Cyanobacteria in Azolla pinnata

D
Farm yard manure

Question 10
1 / -0

Which one of the following is not a biofertilizer?

A
Agrobacterium

B
Rhizobium

C
Nostoc

D
Mycorrhiza

Submit Test

Microbes in Hum...

Question 1

Azolla - Anabaena symbiosis

Mycorrhiza

Legume-Rhizobium symbiosis

Algae-fungi symbiosis

Question 2

Four step process.

One step process.

Two step process.

Three step process.

Question 3

Leghaemoglobin functions as oxygen scavenger during $${N_2}$$ -fixation.

Enzyme nitrogenase, which is required to fix atmospheric $${N_2}$$, is active in the presence as well as absence of oxygen.

N, P and K are referred to as critical elements for crop plants as they easily become deficient in soil due to higher plant requirement and repeated cultivation.

The coordinated activities of the legume and Rhizobium bacteria depend on chemical interactions between the symbiotic partners.

Question 4

Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1

Statement 1 is true and statement 2 is false.

Both statements 1 and 2 are false.

Question 5

Anabaena

Tolypothrix

Chlorella

Nostoc

Question 6

Azotobacter

Azospirillum

Rhizobium

Nostoc

Question 7

Nostoc

Glomus

Azotobacter

Frankia

Question 8

Azolla and blue green algae

Nostoc and legume

Rhizobium and grasses

Salmonella and E. coli

Question 9

Cyanobacteria

Rhizobium

Cyanobacteria in Azolla pinnata

Farm yard manure

Question 10

Agrobacterium

Rhizobium

Nostoc

Mycorrhiza

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