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: 28 g soil sample was heated to a constant weight of 24 g. When further heated to red hot and cooled, it weighed 18 g. What is the percentage of humus in the soil? Options:
  A) 22.2
  B) 55.6
  C) 75.0
  D) 25.0
  E) 35.7
  Show Answer
  The correct answer is A .
• Question 2: The part of the human gut that has an acidic content is the Options:
  A) stomach
  B) duodenum
  C) ileum
  D) colon
  Show Answer
  The correct answer is A .
• Question 3: Adaptive radiation is illustrated in Options:
  A) modified insect mouthparts
  B) dentition in mammals
  C) wings in birds and bats
  D) appendages in insects
  Show Answer
  The correct answer is A .
• Question 4: A pyramid of numbers can be defined as Options:
  A) the number of plants and animals in an ecosystem
  B) an arrangement of organism according to their habitat
  C) the numerical relationships of a food chain
  D) the number of plants and animals in a population
  E) the total number of species and general in a community
  Show Answer
  The correct answer is C .
• Question 5: What will be the result of the first filial generation (F₁) and the second filial generation (F₂) of a mono-hybrid cross between pure line normal-winged Drosophilia flies and pure line short-winged flies, if the gene for the normal wing is dominant? Options:
  A) F₁ flies all short-winged and F₂ flies all normal-winged
  B) F₁ flies all normal and F₂ flies all short-winged
  C) F₁ flies all short-winged and three-quarters of F₂ flies are short-winged
  D) F₁ flies all normal-winged and three-quarters of F₂ flies are normal-winged
  Show Answer
  The correct answer is D .
• Question 6: The difference in structure, morphological and behavior of plant and animal is called Options:
  A) adaptation
  B) evolution
  C) variation
  D) succession
  Show Answer
  The correct answer is C .
• Question 7:

  

  The structure labelled I is formed as a result of the fusion of

  Options:
  A) two pairs of nuclei
  B) several pairs of nuclei
  C) a pair of nuclei
  D) two pairs of nucleoli
  Show Answer
  The correct answer is B .
• Question 8:

  

  In the diagram, if species i, ii and iii interact in a community, which of the following statement is true?

  Options:
  A) the population of species ii is growing at a slow rate
  B) the population of species iii has reached its carrying capscity?
  C) the population of species I has become extinct
  D) the population of species I is always
  Show Answer
  The correct answer is C .
• Question 9:

  

  Using the diagram, sexual reproduction is illustrated in

  Options:
  A) ii
  B) i
  C) iii
  D) iv
  Show Answer
  The correct answer is B .
• Question 10:

  

  A noticeable adaptation of the animal to its aquatic habitat is the possession of

  Options:
  A) a wide mouth
  B) large eyes
  C) webbed digits
  D) fore limbs
  Show Answer
  The correct answer is C .