WBBSE For Class 9 Life Science Chapter 4 Biology And Human Welfare MCQS

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Chapter 4 Biology And Human Welfare MCQs

Question 1. Which one of the following helps in increasing the yield of rice-T

  1. Pseudomonas
  2. Azotobactor
  3. Spirulina
  4. Azolla

Answer: 4. Azolla.

Question 2. Which one is a symbiotic bacteria?

  1. Clostridium
  2. Chlorobium
  3. Chromatium
  4. Rhizobium

Answer: 4. Rhizobium

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Question 3. The algae spirulina is-

  1. Biofertiliser
  2. Single-cell protein
  3. Antibiotic
  4. Biopesticide

Answer: 3. Antibiotic.

Question 4. Microbes are very useful in the production of-

  1. Vaccine
  2. Antibiotic
  3. Fuel
  4. All the above

Answer: 4. All the above.

WBBSE For Class 9 Life Science Chapter 4 Biology And Human Welfare MCQS

Wbbse Class 9 Life Science Chapter 4 Mcq With Answers

Question 5. Which one of the following is not a biofertilizer?

  1. Agrobacterium
  2. Rhizobium
  3. Nostoc
  4. Mycorrh

Answer: 3. Nostoc.

Question 6. The pathogen of malaria is-

  1. Bacteria
  2. Virus
  3. Protozoa
  4. Nematodes

Answer: 3. Protozoa.

Question 7. BCG is a vaccine used for the disease-

  1. Malaria
  2. Tuberculosis
  3. Pneumonia
  4. Cholera

Answer: 2. Tuberculosis.

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Question 8. The WASH program was launched by –

  1. UNESCO
  2. Russia
  3. IUCN
  4. UNICEF

Answer: 4. UNICEF.

Question 9. WBC cells associated with immunity are-

  1. Neutrophil
  2. Eosinophil
  3. Basophil
  4. Monocyte

Answer: 1. Neutrophil.

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Question 10. Antibodies are-

  1. Carbohydrate
  2. Protein
  3. Lipid
  4. Vitamins

Answer: 2. Protein.

Question 11. The process of developing immunity against infection is called-

  1. Immunization
  2. Vaccination
  3. Sanitation
  4. Toxication

Answer: 1. Immunization.

Question 12. A sexually transmitted disease is –

  1. Malaria
  2. Dengue
  3. AIDS
  4.  Filaria

Answer: 3. AIDS.

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Question 13. This germ causes serious diarrhea in humans. It is –

  1.  Salmonella
  2. Mycobacterium
  3. Agaricus
  4. Corynebacterium

Answer: 1. Salmonella

Question 14. This virus is transmitted through blood transfusion. This is –

  1. Hepatitis A virus
  2.  Hepatitis B virus
  3. Influenza virus
  4. None

Answer: 2. Hepatitis B virus

Question 15. Flavivirus causes-

  1. Hepatitis
  2. AIDS
  3.  Dengue
  4. Influenza

Answer: 3. Dengue

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Question 16. The cause of tuberculosis is a-

  1. Virus
  2. Protozoa
  3. Bacteria
  4. Fungi

Answer: 3. Bacteria

Question 17. Retroviruses cause a disease. This is known as –

  1. Autoimmune disease
  2. Immune deficiency disease
  3. Hepatitis B
  4. Hepatitis A

Answer: 3. Immune deficiency disease

Question 18. Mycorrhiza is an association of-

  1. Bacteria and virus
  2. Algae and fungi
  3. Fungi and roots of plants
  4. Fungi and gymnosperms

Answer: 3. Fungi and roots of plants

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Question 19. Which of the following is not a type of immunoglobulin?

  1. IgG
  2. IgE
  3. IgA
  4. IgS

Answer: 4. IgS

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Question 20. The foreign substances that on entering our body activate the body’s immune system are-

  1. Antibodies
  2. Antigens
  3.  Immunoglobulins
  4.  Lymphocytes

Answer: 2. Antigens

Question 21. Which of the following vaccines contain killed pathogens?

  1. Killed vaccine
  2. Toxoid vaccine
  3. Attenuated vaccine
  4. Conjugate vaccine

Answer: 1. Killed vaccine

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Question 22. Which of the following is not a type of T-cell?

  1. Cytotoxic T-cell (T, cell)
  2. Helper T-cell (T,, cell)
  3. Suppressor T-cell (T, cell)
  4. Plasma T-cell (T, cell).

Answer: (4) Plasma T-cell (T, cell)

Question 23. Which of the following is a fungus acting as a bio-control agent?

  1. Bacillus thuringiensis
  2. Caudovirales
  3. Nosema locustae
  4. Beauveria bassiana

Answer: 4. Beauveria bassiana

Wbbse Life Science Class 9 Chapter 4 Multiple Choice Questions

Question 24. Tetanus is caused by

  1. Bacteria
  2. Virus
  3. Protozoa
  4. Fungi

Answer: 1. Bacteria

Question 25. The causative agent of diphtheria is –

  1. Clostridium tetani
  2. Streptococcus pneumoniae
  3. Mycobacterium tuberculosis
  4. Corynebacterium diphtheriae

Answer: 4. Corynebacterium diphtheriae

Question 26. Yellowing of skin and eye is a symptom of –

  1. Pneumonia
  2. Tetanus
  3. Hepatitis
  4. AIDS

Answer: 3. Hepatitis

Question 27. Dengue is caused by

  1. Plasmodium vivax
  2. Plasmodium malaria
  3. Flavivirus
  4. Plasmodium falciparum

Answer: 3. Flavivirus

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Question 28. Which of the following is an anaerobic nitrogen-fixing bacteria, acting as a biofertilizer?

  1. Azotobacter
  2.  Clostridium
  3. Derxia
  4. Rhizobium

Answer: 1. Azotobacter

Question 29. Fungi involved in the formation of mycorrhiza are-

  1. Agaricus
  2. Amanita
  3. Saccharomyces
  4. Ascobolus

Answer: 2. Amanita

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