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 1: The F₁ of a cross between a tall and a dwarf plant was tall. The F₁ was advanced to F₂. How many of 120F₂ plants will be dwarf? Options:
  A) 30
  B) 60
  C) 90
  D) 120
  Show Answer
  The correct answer is A .
• Question 2: Carbon monoxide poisons tissue by Options:
  A) constricting the blood vessels
  B) killing the cells
  C) combining with haemoglobin
  D) rupturing the blood vessels
  Show Answer
  The correct answer is C .
• Question 3: One disease NOT caused directly by bacteria is Options:
  A) malaria
  B) tuberculosis
  C) pneumonia
  D) tetanus
  E) cholera
  Show Answer
  The correct answer is A .
• Question 4:

  

  Use the diagram above to answer this question.

  Insulin is produced by the endocrine organ labelled

  Options:
  A) IV
  B) III
  C) II
  D) I
  Show Answer
  The correct answer is B .
• Question 5:

  

  In the diagram, the structure labelled I is sensitive to

  Options:
  A) light and touch
  B) chemicals only
  C) light only
  D) chemicals and touch
  Show Answer
  The correct answer is A .
• Question 6: Accommodation of the human eye is best described as the Options:
  A) ability to see distant objects
  B) movement of upper and lower eyelids
  C) focusing of near and distant objects
  D) changing of lens shape due to varying light intensities
  E) constant adjustment of the iris
  Show Answer
  The correct answer is C .
• Question 7:

  When a Spirogyra cell is immersed in a salt solution more concentrated than its cell sap,it?

  Options:
  A) remains unchanged
  B) takes tip water and burst
  C) absorbs a little water
  D) loses water and shrivels
  Show Answer
  The correct answer is D .
• Question 8:

  The villus in the small intestine is significant because

  Options:
  A) Increases the surface area for absorption
  B) increases the surface area for digestion
  C) assists in mixing digested food
  D) assists in filtering undigested food
  Show Answer
  The correct answer is A .
• Question 9:

  Only specially adapted micro-organisms are found in

  Options:
  A) Salty water
  B) Humid air
  C) Moist soil
  D) Mouth cavities
  Show Answer
  The correct answer is A .
• Question 10:

  The structure that joins the two strands of a chromosome together is the?

  Options:
  A) spindle
  B) cellulose
  C) centromere
  D) chromatid
  Show Answer
  The correct answer is C .