Biology MCQs

11. Which of the following is the first formed primary xylem elements?
[A] Protoxylem
[B] Xylem parenchyma
[C] Metaxylem
[D] Xylem fibres

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12. RBCs are formed in which of the following in the adults?
[A] black bone marrow
[B] white bone marrow
[C] red bone marrow
[D] blue bone marrow

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13. Which one of the following diseases is least infectious? (UPSC Prelims 1991)
[A] Leprosy
[B] Tuberculosis
[C] Conjunctivitis
[D] Hepatitis

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14. Consumption of fish is considered to be healthy when compared to flesh of other animals because fish contains which of the following minerals? (UPSC Prelims 1998)
[A] Polyunsaturated fatty acids
[B] saturated fatty acids
[C] essential vitamins
[D] more carbohydrates and proteins

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15. Which vitamin is also called as ascorbic acid?
[A] Vitamin A
[B] Vitamin C
[C] Vitamin D
[D] Vitamin K

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16. A.I. Oparin is related to which of the following theories in the field of biology?
[A] Chemosynthetic theory
[B] A Theory of Life
[C] Infectious Disease Theory
[D] A Theory of the Origin of Eukaryotic Cells

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17. Which modern concept was pioneered by Rudolf Virchow?
[A] pathological processes
[B] process of fermentation
[C] isotopes as tracers to study chemical and biological processes
[D] None of these

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18. Red algae are known as__?
[A] Chlorophyceae
[B] Rhodophyceae
[C] Phaeophyceae

[D] None of these

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19. How do small molecules pass through the outer membrane of mitochondria?
[A] Carrier protein
[B] Channels
[C] Porins
[D] ATP pump

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20. Wounds on the chorioallantoic membrane are produced by__?
[A] Herpes B virus
[B] Vaccinia virus
[C] Herpes simplex virus
[D] all of these

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