Biology 2019 Past Questions | WAEC

Study the following Biology past questions and answers for JAMBWAEC  NECO and ICAN. Get prepared with official past questions and answers for upcoming examinations.

46. In a complete dominance monohybrid cross between a pure breeding yellow-flowered plant Y and a pure breeding white-flowered plant y, the result of the first filial generation is _________

  • A. 50 % yellow flowers
  • B. 75% yellow flowers
  • C. all yellow flowers
  • D. all white flowers

47.  A man whose blood group is heterozygous B is married to a woman whose blood up is also heterozygous B

Which of the following statements is correct about the blood group of their four offspring?

  • A. Three of them belong to blood group B
  • B. Three of them belong to blood group O
  • C. None of them belongs to blood group O
  • D. Two of them belong to blood group B

48.  The cross between RrTtand rrttwhere R is a gene for red colour and T for tallness will result in______

  • A. all the offspring being tall with red fruits
  • B. 25 % tall with red fruits
  • C. 50 % tall with red fruits
  • D. 75 % tall with red fruits

49.  The yellow and black stripes on the body of wasps is an example of________

  • A. mimicry
  • B. courtship behaviour
  • C. camouflage
  • D. warning colouration

50. The biological importance of the dance by the worker honeybee is that it___________

  • A. acts as a signal for mating
  • B. serves as a warning signal
  • C. signals the availability of food
  • D. serves as a means of identifying members of the caste

1 a. Name five vertebrae in mammals with their corresponding locations.    [10 marks]

b. State one function each of the following parts in a dicotyledonous leaf:
 (i) palisade;
 (ii) vascular bundle;    
    (iii) epidermis.                            [3 marks]

c. State one function each of the following parts in the stem of a flowering plant:    
 (i) sieve tube;
 (ii) cortex;
    (iii) pith.    

d. In a tabular form, state:
 (i) two external structural differences between the stem and root of a maize seeding.    [2 marks]
 (ii) two internal structural differences between the stem and root of a maize seeding.    [2 marks]


  •  State three features of the small intestine that increase the rate of absorption of digested food.    [3 marks]
  •  Explain briefly what happens to the glucose formed in a plant during photosynthesis.    [3 marks]
  •  Explain briefly the mode of feeding in each of the following organisms:
     (i) Euglena;    [4 marks]
        (ii) Spirogyra.    [4 marks]
  •  State threecharacteristics of an Estuarine habitat.    [3 marks]
  •  State threedifferences between an aquatic habitat and a terrestrial habitat.    [3 marks]


  •  State five :
     (i) challenges that make conservation of resources difficult;    [5 marks]
        (ii) ways by which the Government of a country ensures conservation of natural resources.    [5 marks]
  •  What is an endangered species?    [3 marks]
  •  A child with blood group O was born to a mother of blood group A.
     (i) What is the blood group genotype of the child?    [1 marks]
        (ii) What are the possible blood group genotypes of the father?    [3 marks]
  •  State three reasons why genetic variation is important to plants.    [3 marks]


  • A homozygous tall, red flower plant was crossed with a homozygous dwarf, white flower plant. The F1 were selfed and 160 F2 plants were obtained.
    (i)  Name the type of genetic cross.    [1 marks]
          (ii) State one reason for the answer in 4(a)(i).    [1 marks]

      b.(i)  What is evolution?  [2  marks]
        (ii)  With the aid of a genetic diagram, state the phenotypic ratio of F2 generation.    [13 marks]
        (iii) Calculate the number of tall and white flowers that  would be obtained in the F2 generation.  [3  marks]


  1.  (i)  Complete the table below with the respiratory surface of each of the listed organisms.


respiratory surface

Tadpole (2days old)




Domestic fowl




Earth Worm 




       (ii)  State five characteristic features of respiratory surfaces in organisms.    [5 marks]

  • Make a drawing, 4 cm – 6 cm long of the respiratory organ in Tilapia and label fully.    [9 marks]

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