Biology MCQs

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

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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

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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

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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

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15. What is Rancidity?
[A] Deterioration of Fat
[B] Deterioration of Glucose
[C] Deterioration of Protein
[D] Deterioration of Vitamins

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16. Which of the following is not the Class of Biomolecules?
[A] Carbohydrate
[B] Proteins
[C] Catalyst
[D] Nucleic acids and Lipids

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17. Which disinfectant is effective against viruses?
[A] Hydrogen peroxide
[B] Hypochlorite
[C] Formaldehyde
[D] All of these

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18. Syphilis is caused by which of the following bacteria?
[A] Treponema pallidum
[B] Yersinia pestis
[C] Neisseria gonorrhoeae
[D] Campylobacter

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19. A bryophyte that has nitrogen-fixing blue-green algae in its thallus is__?
[A] Pogonatum
[B] Riccia
[C] Marchantia
[D] Anthoceros

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20. To which family do brown mustard and broccoli belong?
[A] Solanaceae
[B] Fabaceae
[C] Cruciferae
[D] None of these

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