Biology Exam Past Questions and Answers | JAMB, WAEC and NECO

Biology is the study of life and living things. It can be divided into different areas that look at the structure, function, anatomy, and behavior of organisms.

• Question 641: A major limitation in the use of the potometer for measuring the rate of transpiration is that Options:
  A) it is made of breakable glass materials
  B) it measures the rate of water intake
  C) it measure the rate of water loss throuh the stern only
  D) the movement of the air buble in the potometer cannot be timed accurately
  Show Answer
  The correct answer is D .
• Question 642: Which of the following is lacking in the diet of a person with kwashiorkor? Options:
  A) proteins
  B) carbohydrates
  C) minerals
  D) vitamins
  Show Answer
  The correct answer is A .
• Question 643: The sequence of the one-way gaseous exchange mechanism in a fish is Options:
  A) gills ⇢ operculum ⇢ mouth
  B) mouth ⇢ gills ⇢ operculum
  C) mouth ⇢ operculum ⇢ gills
  D) operculum ⇢ mouth ⇢ gills
  Show Answer
  The correct answer is B .
• Question 644: The theory of natural selection was postulated by Options:
  A) Gregor Mendel
  B) Matthias Schleiden
  C) Charles Darwin
  D) Robert Hook
  Show Answer
  The correct answer is C .
• Question 645: Fruit enlargement can be induced by spraying young ovary with Options:
  A) cytokinin, abscisic acid and ethylene
  B) gibberellin, ethylene and abscisic acid
  C) auxin, abscisic acid and ethylene
  D) auxin, cytokinin and gibberellin
  Show Answer
  The correct answer is D .
• Question 646: The dorsal and anal fins of fish are used for Options:
  A) Upward movement
  B) Controlling rolling
  C) Downward movement
  D) Steering
  E) Buoyancy
  Show Answer
  The correct answer is B .
• Question 647: Denitrifying bacteria in nature liberate gaseous nitrogen directly from Options:
  A) ammonium salts
  B) soil nitrates
  C) thunderstorms
  D) soil nitrites
  E) plant and animal proteins
  Show Answer
  The correct answer is B .
• Question 648:

  

  In H, the cotyledons are carried above the soil because

  Options:
  A) the epicotyl grows faster than the hypocotyl
  B) the hypocotyl grows faster than the epicotyl
  C) both grow at the same rate
  D) the epicotyl outgrow the radicle
  Show Answer
  The correct answer is B .
• Question 649:

  

  Use the diagram above to answer this question.

  The gas evolved in the process is

  Options:
  A) carbon (IV) oxide
  B) nitrogen
  C) oxygen
  D) carbon (II) oxide
  Show Answer
  The correct answer is A .
• Question 650:

  The overall reaction in glycolysis can be summarised as

  Options:
  A) C${}_6$H${}_{12}$O${}_6$ -----> C${}_3$H${}_4$O${}_3$ + 4H + ATP
  B) C${}_6$H${}_{12}$O${}_6$ -----> 2C${}_3$H${}_4$O${}_3$ + 4H + 2ATP
  C) C${}_6$H${}_{12}$O${}_6$ -----> 2C${}_3$H${}_4$O${}_3$ + 4H + ADP
  D) C${}_6$H${}_{12}$O${}_6$ -----> 2C${}_3$H${}_4$O${}_3$ + 4H + 2ADP
  Show Answer
  The correct answer is B .