2nd Year Biology Past Papers

• Here are the detailed 2nd year biology past paper to help you prepare for your exams.
• 1. The protection of internal environment form the harms of the fluctuations in external environment are termed as: 
• (a) Osmoregulation           (b) Thermoregulation         (c) Excretion         (d) Homeostasis
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• 2. Extracellular environment may be of diluted solution compared to the cell concentration thus designated as:
• (a) Isotonic           (b) Hypertonic         (c) Hypotonic         (d) Cotonic
• 3. The more concentrated external environment is termed as:
• (a) Hypotonic          (b) Hypertonic          (c) Isotonic        (c) Peritonic
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• 4. In urea cycle , the detoxified form of ammonia is:
• (a) Urea        (b) Ammonium ions        (c) Uric acid       (c) Nitrates
• 5. Those plants which have moderate water availability are called?
• (a) Hydrophytes     (b) Mesophytes         (c) Xerophytes        (d) Saprophytes
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• 6. The mesophyte plant is:
• (a) Cacti      (b) Hydrilla    (c) Brassica    (d) Kikar
• 7. Hydrophytes posses:
• (a) Small leaves    (b) Large leaves       (c) Less water     (d) stomata on lower surface of leaves
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• 8. The stomata are located on the upper surface only in ……. .
• (a) Xerophytes      (b) Hydrophytes       (c) Mesophytes      (d) Epiphytes
• 9. The plants that have adaptation of small and thick leaves to reduce water loss are called?
• (a) Hydrophytes         (b) Mesophytes         (c) Xerophytes         (d) Hygrophytes
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• 10. Which one is not a mesophyte?
• (a) Brassica        (b) Rose            (c) Mango         (d) Cacti
• 11. The category of plants that has adaptation of small and thick leaves to limit water loss is called?
• (a) Hydrophytes        (b) Xerophytes         (c) Mesophytes      (d) Halophytes
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• 12. Fresh water protozoans pump out excess water by …… .
• (a) Food vacoule         (b) Pinocytosis        (c) Contractil vacuole      (d) Exocytosis
• 13. Anhydrobiosis refers to tolerate ….. .
• (a) Dehydration         (b) Hydration           (c) Anhydration        (d) Rehydration
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• 14. Animals that do not require adjusting their internal osmotic state actively are known as:
• (a) Osmoregulators            (b) Osmocoformers          (c) Terrestrial          (d) Hypertonic
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• 15. Trirmethylamine Oxide is produced in ……. .
• (a) Hag fish          (b) Bony fish           (c) Marine fish          (d) Cartilaginous fish
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• 16. The tolerance of dehydration is:
• (a) Osmoconformers           (b) Osmoregulators         (c) Anhydrobiosis         (d) Dehydration
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• 17. Contractile vacuoles are found in ……. .
• (a) Plants           (b) Fresh water protozoa         (c) Terrestrial animals      (d) Marine plants
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• 18. A dilute solution compared to cell concentration is termed as:
• (a) Hypertonic     (b) Hypotonic         (c) Isotionic       (d) Paratonic
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• 19. Which one of the following is excretophore ?
• (a) Stem            (b) Root          (c) Bark       (d) Leaves
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• 20. Mechanism which eliminates nitrogenous waste is referred as:
• (a) Osmoregulation        (b) Excretion       (c) Thermoregulation      (d) Egestion
• 21. Animals excreting urea are called?
• (a) Ureotelic        (b) Ammonotelic       (c) Uricotelic      (d) Excretotelic
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• 22. A diluted solution compared to cell concentration is termed as:
• (a) Hypertonic     (b) Hypotonic          (c) Isotonic      (d) Paratonic
• 23. One gram of ammonia requires how much amount of water for its removal …. .
• (a) 50 ml        (b) 100 ml        (c) 250 ml      (d) 500 ml
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• 24. Ammonia is produced as excretory product by the animals inhabiting the medium.
• (a) Isotonic     (b) Hypotonic         (c) Hypertonic       (d) Xeric
• 25. Animals excreting ammonia are……. .
• (a) Ureotelic        (b) Uricotelic       (c) Ammonotelic      (d) Excretotelic
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• 26. The excretory product that requires minimum water for its removal is:
• (a) Urea         (b) Uric acid           (c) Ammonia        (d) Creatinine
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• 27. Uric acid is produced from the metabolism of ……… .
• (a) Amino acid         (b) Nucleic acid        (c) Fatty aci      (d) Protein
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