JAMB Biology questions

438 questions with answers and explanations. Tap an option to check yourself.

1. Question 321· Respiration· JAMB

   Complete aerobic respiration of one glucose molecule yields about

   • A2 ATP
   • B38 ATP
   • C100 ATP
   • D6 ATP

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   Answer: B. 38 ATP

   Explanation and discussion

2. Question 322· Respiration· JAMB

   Complete aerobic respiration of one molecule of glucose produces about

   • A6 molecules of ATP
   • B2 molecules of ATP
   • C100 molecules of ATP
   • D38 molecules of ATP

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   Answer: D. 38 molecules of ATP

   Explanation and discussion

3. Question 323· Respiration· JAMB

   Gaseous exchange in the mammalian lung takes place in the:

   • Atrachea
   • Bbronchi
   • Cpleura
   • Dalveoli

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   Answer: D. alveoli

   Explanation and discussion

4. Question 324· Respiration· JAMB

   The alveoli are efficient for gaseous exchange because they

   • Acontain no capillaries
   • Bhave thick walls
   • Care dry
   • Dhave thin, moist walls and a rich blood supply

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   Answer: D. have thin, moist walls and a rich blood supply

   Explanation and discussion

5. Question 325· Respiration· JAMB

   The respiratory surface of an earthworm is its

   • Agills
   • Blungs
   • Cmoist skin
   • Dtracheae

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   Answer: C. moist skin

   Explanation and discussion

6. Question 326· Respiration· JAMB

   During vigorous exercise, anaerobic respiration in human muscles produces

   • Alactic acid
   • Bethanol
   • Cglucose
   • Doxygen

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   Answer: A. lactic acid

   Explanation and discussion

7. Question 327· Respiration· JAMB

   Fish exchange gases through their

   • Alungs
   • Bgills
   • Cskin only
   • Dswim bladder

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   Answer: B. gills

   Explanation and discussion

8. Question 328· Respiration· JAMB

   Insects exchange gases through

   • Agills
   • Ba system of tracheae opening at spiracles
   • Clungs
   • Dthe skin only

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   Answer: B. a system of tracheae opening at spiracles

   Explanation and discussion

9. Question 329· Respiration· JAMB

   Which word equation represents aerobic respiration?

   • Aglucose + oxygen → carbon(IV) oxide + water + energy
   • Bcarbon(IV) oxide + water → glucose + oxygen
   • Cglucose → lactic acid + energy
   • Dglucose → ethanol + carbon(IV) oxide

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   Answer: A. glucose + oxygen → carbon(IV) oxide + water + energy

   Explanation and discussion

10. Question 330· Respiration· JAMB

    Anaerobic respiration in yeast is also called

    • Atranspiration
    • Bphotosynthesis
    • Cfermentation
    • Ddigestion

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    Answer: C. fermentation

    Explanation and discussion

11. Question 331· Respiration· JAMB

    The volume of air breathed in or out in one normal breath is the

    • Aresidual volume
    • Bvital capacity
    • Ctidal volume
    • Dtotal lung capacity

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    Answer: C. tidal volume

    Explanation and discussion

12. Question 332· Respiration· JAMB

    During inhalation in humans, the diaphragm

    • Acontracts and flattens
    • Brelaxes and becomes dome-shaped
    • Cmoves upwards
    • Ddoes not move

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    Answer: A. contracts and flattens

    Explanation and discussion

13. Question 333· Respiration· JAMB

    The respiratory quotient (RQ) when carbohydrate is respired aerobically is

    • A0.9
    • B0.7
    • C1.0
    • D2.0

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    Answer: C. 1.0

    Explanation and discussion

14. Question 334· Respiration· JAMB

    Yeast is used in baking bread because it produces

    • Astarch
    • Boxygen, which softens the bread
    • Clactic acid
    • Dcarbon(IV) oxide, which makes the dough rise

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    Answer: D. carbon(IV) oxide, which makes the dough rise

    Explanation and discussion

15. Question 335· Respiration· JAMB

    The Krebs cycle takes place in the

    • Acell membrane
    • Bcytoplasm
    • Cribosomes
    • Dmatrix of the mitochondria

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    Answer: D. matrix of the mitochondria

    Explanation and discussion

16. Question 336· Respiration· JAMB

    Exhaled air turns lime water milky because it contains more

    • Aoxygen
    • Bcarbon(IV) oxide
    • Cnitrogen
    • Dwater vapour

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    Answer: B. carbon(IV) oxide

    Explanation and discussion

17. Question 337· Respiration· JAMB

    In a fish, water flows over the gills in the opposite direction to the blood. This counter-current flow

    • Amaximises the uptake of oxygen
    • Bslows down the heart
    • Cremoves salt from the blood
    • Dreduces water loss

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    Answer: A. maximises the uptake of oxygen

    Explanation and discussion

18. Question 338· Respiration· JAMB

    After vigorous exercise, a person continues to breathe deeply in order to

    • Aremove excess nitrogen
    • Bcool the body
    • Csupply oxygen to break down the lactic acid built up (repay the oxygen debt)
    • Dstore oxygen in the muscles

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    Answer: C. supply oxygen to break down the lactic acid built up (repay the oxygen debt)

    Explanation and discussion

19. Question 339· Respiration· JAMB

    Compared with aerobic respiration, anaerobic respiration releases

    • Ano energy at all
    • Bmore energy
    • Cthe same energy
    • Dless energy per molecule of glucose

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    Answer: D. less energy per molecule of glucose

    Explanation and discussion

20. Question 340· Respiration· JAMB

    The rate of breathing is mainly controlled by the concentration of

    • Anitrogen in the lungs
    • Boxygen in the air
    • Cglucose in the blood
    • Dcarbon(IV) oxide in the blood

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    Answer: D. carbon(IV) oxide in the blood

    Explanation and discussion