WBBSE Class 9 Life Science MCQ Questions Chapter 4.2 Microbes in Human Welfare

Well structured WBBSE Class 9 Life Science MCQ Questions Chapter 4.2 Microbes in Human Welfare can serve as a valuable review tool before exams.

Microbes in Human Welfare Class 9 WBBSE MCQ Questions

Multiple Choice Questions :

Question 1.
Microbes are-
(A) Virus
(B) Bacteria
(C) Protozoa
(D) All of these
Answer:
(D) All of these

Question 2.
The term ‘microbe’ was coined by-
(A) Robert Hook
(B) Sedillot
(C) Robert Brown
(D) Leeuwenhoek
Answer:
(B) Sedillot

Question 3.
Azolla maintains symbiotic association with-
(A) Azotobacter
(B) Clostridium
(C) Nostoc
(D) Anabaena
Answer:
(D) Anabaena

Question 4.
Which is not a bio-fertiliser?
(A) Rhizobium
(B) Azolla
(C) Agaricus
(D) Azotobacter
Answer:
(C) Agaricus

WBBSE Class 9 Life Science MCQ Questions Chapter 4.2 Microbes in Human Welfare

Question 5.
Some cyanobacteria are used as bio-fertiliser because-
(A) They are capable of trapping free O2 more than other plants
(B) They can solubilise phosphorus
(C) They can trap atmospheric nitrogen
(D) They help the soil to retain more water
Answer:
(C) They can trap atmospheric nitrogen

Question 6.
‘Bt’ for Bt-cotton stands for-
(A) Biologically transformed
(B) Biotechnology
(C) Bacillus thuringiensis
(D) None of these
Answer:
(C) Bacillus thuringiensis

Question 7.
Mycorrhiza is an-
(A) Association of fungi and algae
(B) Association of fungi and flowering plants
(C) Association of fungi and bacteria
(D) Association of algae and vascular plants
Answer:
(B) Association of fungi and flowering plants

Question 8.
Cyanobacteria are-
(A) Chemosynthetic bacteria
(B) Photosynthetic prokaryotic microorganism
(C) Non-photosynthetic nitrogen-fixing prokaryotic microorganism
(D) Nitrogen-fixing protozoa
Answer:
(B) Photosynthetic prokaryotic microorganism

WBBSE Class 9 Life Science MCQ Questions Chapter 4.2 Microbes in Human Welfare

Question 9.
A soil-dwelling nitrogen-fixing bacterium is-
(A) Anabaena
(B) Salmonella
(C) Clostridium
(D) Lactobacillus
Answer:
(C) Clostridium

Question 10.
Which of the following microorganisms can kill insect pests?
(A) Bacillus thuringiensis
(B) Leptomonas
(C) Nosema locustae
(D) All of these
Answer:
(D) All of these

Question 11.
The virus used in bio-control of insect pests is-
(A) Phage virus
(B) Rubella virus
(C) Nuclear Polyhedrosis virus
(D) Lipovirus
Answer:
(C) Nuclear Polyhedrosis virus

Question 12.
An anaerobic nitrogen-fixing non-symbiotic bacterium-
(A) Azotobacter
(B) Clostridium
(C) Rhizobium
(D) Azospirillum
Answer:
(B) Clostridium

Question 13.
VAM is a/an-
(A) Ectomycorrhiza
(B) Ectendomycorrhiza
(C) Endomycorrhiza
(D) Cyanobacterium
Answer:
(C) Endomycorrhiza

WBBSE Class 9 Life Science MCQ Questions Chapter 4.2 Microbes in Human Welfare

Question 14.
Granulosis virus and NPV are similar as both act as-
(A) Antibacterial substance
(B) Bio-control agents
(C) Bio-fertilisers
(D) Disease causing agent for human
Answer:
(B) Bio-control agents

Question 15.
Bacteria used for controlling Japanese beetle-
(A) Bacillus thuringiensis
(B) Bacillus popilae
(C) Bacillus subtilis
(D) Rhizobium fascioli
Answer:
(B) Bacillus popilae

Question 16.
Spodopterin, a bio-control agent for insect pest is composed of-
(A) Virus
(B) Bacteria
(C) Protozoa
(D) Fungus
Answer:
(D) Fungus

Question 17.
Example of cyanobacteria is-
(A) Anabaena
(B) Gleocapsa
(C) Oscillatoria
(D) All of these
Answer:
(D) All of these

WBBSE Class 9 Life Science MCQ Questions Chapter 4.2 Microbes in Human Welfare

Question 18.
Mycorrhizae fungi develop in symbiotic association with-
(A) Root system of pine
(B) Leaf of fern
(C) Green algae
(D) None of these
Answer:
(A) Root system of pine

Question 19.
Application of Azolla in paddy fialds are popularly practiced in-
(A) European countries
(B) South American states
(C) Southeast Asian countries
(D) All of these
Answer:
(C) Southeast Asian countries

Question 20.
Mycorrhiza is used as a bio-fertiliser because it-
(A) Can remove harmful heavy metals from soil
(B) Can absorb water
(C) Can help in”mineral absorption
(D) All of these
Answer:
(D) All of these

Question 21.
An antibiotic producing fungus is-
(A) Aspergillus
(B) Agaricus
(C) Penicillium
(D) Saccharomyces
Answer:
(C) Penicillium

Question 22.
Nitrifying bacteria are-
(A) Parasitic bacteria
(B) Chemosynthetic bacteria
(C) Autotrophic bacteria
(D) None of these
Answer:
(B) Chemosynthetic bacteria

Question 23.
Bacteria which are capable of trapping atmospheric nitrogen are-
(A) Putrefying bacteria
(B) Nitrogen-fixing bacteria
(C) Denitrifying bacteria
(D) Nitrifying bacteria
Answer:
(B) Nitrogen-fixing bacteria

WBBSE Class 9 Life Science MCQ Questions Chapter 4.2 Microbes in Human Welfare

Question 24.
The bacterium, mostly used in the experiments of biotechnology is-
(A) Rhizobium
(B) Streptomyces
(C) Salmonella
(D) E.coli
Answer:
(D) E.coli

Question 25.
Rhizobium is a-
(A) Free-living, nitrogen-fixing bacteria
(B) Symbiotic, nitrogen-fixing bacteria
(C) Cyanobacteria
(D) Denitrifying bacteria
Answer:
(B) Symbiotic, nitrogen-fixing bacteria

Question 26.
Application of Azolla in paddy field increases in soil.
(A) Phosphorus
(B) Nitrogen
(C) Sulphur
(D) Potassium
Answer:
(B) Nitrogen

Question 27.
Nostoc is a-
(A) Nitrogen-fixing protozoa
(B) Nitrogen-fixing cyanobacteria
(C) Symbiotic fungus
(D) Green algae
Answer:
(B) Nitrogen-fixing cyanobacteria

Question 28.
Which of the following organisms is not used as bio-fertiliser?
(A) Rhizobium
(B) Lichen
(C) Azotobacter
(D) Azolla
Answer:
(B) Lichen

WBBSE Class 9 Life Science MCQ Questions Chapter 4.2 Microbes in Human Welfare

Question 29.
insoluble phosphate of soil is transformed into soluble phosphate by-
(A) Azolla
(B) Nostoc
(C) Rhizobium
(D) Pseudmonas putida
Answer:
(D) Pseudmonas putida

Question 30.
Sweet pea plant can grow in infertile land because of-
(A) Azotobacter
(B) Clostridium
(C) Rhizobium
(D) Anabaena
Answer:
(C) Rhizobium

Question 31.
The microbe which does not have any role as bio-fertiliser is-
(A) Bacteria
(B) Cyanobacteria
(C) Fungus
(D) Protozoa
Answer:
(D) Protozoa

Question 32.
Cyanobacterial colony is formed in-
(A) Equisitum
(B) Cycas
(C) Psilotum
(D) Pinus
Answer:
(B) Cycas

Question 33.
A fungal bio-control agent is-
(A) Nosema
(B) Beauveria bassiana
(C) Popilla japonica
(D) Mattesia grandis
Answer:
(B) Beauveria bassiana

WBBSE Class 9 Life Science MCQ Questions Chapter 4.2 Microbes in Human Welfare

Fill in the blanks :

1 Bacillus thuringiensis produces a poison called _____.
2 Rhizobium is present in the _____ nodules of leguminous plants.
3 Mycorrhiza exhibits the phenomenon of _____.
4. Beauveria bassiana is a fungus, which controls _____ pest population effectively.
5. Mycorrhizal _____ absorb nutrients from soil very efficiently.
6. _____ is a protozoan microbe which effectively controls cotton ball weevils.
7. Anabaena is present in the _____ cavities of Azolla.
Answer:
1. Bt-toxin
2. Root
3. Symbiosis
4. Insect
5. Hyphae
6. Mettasia grandis
7. Leaf

State true or false :

1. Nosema locustae is a bacterium, which is used to control harmful grasshoppers.
2. Examples of aerobic nitrogen-fixing bacteria are Azomonas, Azospirillum.
3. Scientists have introduced genetic materials of Bacillus thuringiensis bacterium in corn and cotton plants.
4. Caudovirales is a fungus, which can control pests.
5. Except paddy field, cyanobacterial colony is formed in Cycas.
6. Viruses are also used as bio-control agents to kill insect pests.
Answer:
1. False
2. True
3. True
4. False
5. True
6. True

WBBSE Class 9 Life Science MCQ Questions Chapter 4.2 Microbes in Human Welfare

Match the columns :

Question 1.

Left column Right column
1. Rhizobium A. Soil living aerobic bacteria
2. Azospirillum B. Anaerobic bacteria
3. Clostridium C. Cyanobacteria
4. Aulosira D. Retorvirus
E. Symbiotic bacteria

Answer:

Left column Right column
1. Rhizobium E. Symbiotic bacteria
2. Azospirillum A. Soil living aerobic bacteria
3. Clostridium B. Anaerobic bacteria
4. Aulosira C. Cyanobacteria

WBBSE Class 9 Life Science MCQ Questions Chapter 4.2 Microbes in Human Welfare

Question 2.

Left column Right column
1. Caudovirales A. Bio-fertiliser
2. Rotavirus B. Hepatitis-A
3. Azolla C. Bio-control agent
4. HAV D. Diarrhoea
E. AIDS

Answer:

Left column Right column
1. Caudovirales C. Bio-control agent
2. Rotavirus D. Diarrhoea
3. Azolla A. Bio-fertiliser
4. HAV B. Hepatitis-A

Question 3.

Left column Right column
1. Algae A. Plasmodium
2. Virus B. NPV
3. Bacteria C. Azolla
4. Protozoa D. Clostridium
E. Glomus

Answer:

Left column Right column
1. Algae C. Azolla
2. Virus B. NPV
3. Bacteria D. Clostridium
4. Protozoa A. Plasmodium

WBBSE Class 9 Life Science MCQ Questions Chapter 4.2 Microbes in Human Welfare

Question 4.

Left column Right column
1. Leguminous plant A. Amanita
2. Mycorrhiza B. Protozoa
3. Malaria causing agent C. Virus
4. Dengue causing agent D. Caudovirales
E. Rhizobium

Answer:

Left column Right column
1. Leguminous plant E. Rhizobium
2. Mycorrhiza A. Amanita
3. Malaria causing agent B. Protozoa
4. Dengue causing agent C. Virus

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