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 721: Which of the following can bring about the greatest increase in the rate of transpiration? Options:
  A) Increased humidity
  B) Reduced temperature
  C) Reduced wind speed
  D) Reduced humidity
  Show Answer
  The correct answer is D .
• Question 722: The manufacture of carbohydrates by plants takes place only in Options:
  A) the leaves
  B) the green stems
  C) chlorophyllous parts
  D) flowering plants
  Show Answer
  The correct answer is C .
• Question 723: During respiration, air circulates round plant tissues via the Options:
  A) lenticels
  B) stomata
  C) guard cells
  D) intercellular spaces
  Show Answer
  The correct answer is D .
• Question 724: In dissection, the rib cage of mammal has to be opened in order to expose the Options:
  A) diaphragm
  B) liver
  C) heart
  D) sternum
  Show Answer
  The correct answer is C .
• Question 725: Agglutination is the _______ of the ________ Options:
  A) coagulation, white bloodcell
  B) coagulation, water
  C) white blood cells, red blood cell
  D) coagulation, red blood cell
  Show Answer
  The correct answer is D .
• Question 726: What proportion of the offspring of a cross between two heterozygous parents will exhibit the recessive condition phenotypically Options:
  A) 1/4
  B) 1/2
  C) 3/4
  D) 4/4
  Show Answer
  The correct answer is A .
• Question 727: An increase in air pressure in the lungs is due to the Options:
  A) increase in the volume of the thoracic cavity
  B) upward movement of he ribs
  C) relaxation of the diaphragm
  D) contraction of the intercostal musles
  Show Answer
  The correct answer is C .
• Question 728:

  

  In the diagram, the genotypic ratio of the offspring of the cross is

  Options:
  A) 1:2
  B) 1:2:1
  C) 1:1:1:1
  D) 3:1
  Show Answer
  The correct answer is B .
• Question 729: Nitrogen is released into the atmosphere when ________ Options:
  A) plants absorbs mineral salt
  B) sugar is completely broken down
  C) through plant uptake
  D) when lightning strike
  Show Answer
  The correct answer is D .
• Question 730: The part of the mammalian ear responsible for the maintenance of balance is the Options:
  A) cochlea
  B) pinna
  C) perilymph
  D) vestibular system
  Show Answer
  The correct answer is D .