11. Which of the following correctly defines an Antigen? (UPSC Prelims 2002)
[A] Lowers body temperature
[B] destroys harmful bacteria
[C] triggers the immune system
[D] is used as an antidote to poison
Show Answer
Correct Answer: C [triggers the immune system]
Notes:
An antigen is any substance that causes your immune system to produce antibodies against it. An antigen may be a substance from the environment, such as chemicals, bacteria, viruses, or pollen. An antigen may also form inside the body.
12. What is the pH range of blood?
[A] 6.55-6.85
[B] 1.55-3.55
[C] 10.5-12
[D] 7.35-7.45
Show Answer
Correct Answer: D [7.35-7.45]
Notes:
Blood has a pH range of 7.35-7.45 which indicates that blood is slightly basic/alkaline. pH scale from 0 to 7 indicates acidic nature, 7 to 14 indicates basic nature of the solution.
13. The main components of biogas are
[A] Methane and Sulphur di-oxide
[B] Methane, Hydrogen and Nitric oxide
[C] Methane and Nitric oxide
[D] Methane and Carbon di-oxide
Show Answer
Correct Answer: D [Methane and Carbon di-oxide]
Notes:
Biogas comprises of CH4, CO2 and small amounts of H2S.
14. Traumatology is related to which of the following statement?
[A] Study of hair
[B] Study of skates and rays
[C] Study of wounds and turnover
[D] Study of nutrition
Show Answer
Correct Answer: C [Study of wounds and turnover]
Notes:
Traumatology is the study of wounds and injuries caused to a person by accidents or violence, and the surgery and repair of damage.
15. What is Rancidity?
[A] Deterioration of Fat
[B] Deterioration of Glucose
[C] Deterioration of Protein
[D] Deterioration of Vitamins
Show Answer
Correct Answer: A [Deterioration of Fat]
Notes:
The process of oxidation of oily and Fatty food, which changes its taste and smell is known as Rancidity. Rancidity generally occurs in Fat.
16. Which of the following is not the Class of Biomolecules?
[A] Carbohydrate
[B] Proteins
[C] Catalyst
[D] Nucleic acids and Lipids
Show Answer
Correct Answer: C [Catalyst]
Notes:
Biomolecules are organic molecules, which are involved in the metabolic process of the living organism. The four important classes of biomolecules are carbohydrates, Proteins, Nucleic acids and Lipids.
17. Which disinfectant is effective against viruses?
[A] Hydrogen peroxide
[B] Hypochlorite
[C] Formaldehyde
[D] All of these
Show Answer
Correct Answer: D [All of these]
Notes:
Hydrogen peroxide, Hypochlorite and Formaldehyde are disinfectants is effective against viruses.
18. Syphilis is caused by which of the following bacteria?
[A] Treponema pallidum
[B] Yersinia pestis
[C] Neisseria gonorrhoeae
[D] Campylobacter
Show Answer
Correct Answer: A [Treponema pallidum]
Notes:
Syphilis is caused by a bacterium called Treponema pallidum and it is spread through contact with a wound of an infected person during sexual activity.
19. A bryophyte that has nitrogen-fixing blue-green algae in its thallus is__?
[A] Pogonatum
[B] Riccia
[C] Marchantia
[D] Anthoceros
Show Answer
Correct Answer: D [Anthoceros]
Notes:
A bryophyte that has nitrogen-fixing blue-green algae in its thallus is Anthoceros. Species of Anthoceros have a small to medium-sized green thallus.
20. To which family do brown mustard and broccoli belong?
[A] Solanaceae
[B] Fabaceae
[C] Cruciferae
[D] None of these
Show Answer
Correct Answer: C [Cruciferae]
Notes:
Brassicaceae or Cruciferae is a medium-sized family of flowering plants commonly known as the mustard, cruciferous or cabbage family.
