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WAEC 2020 Possible Biology Questions and Answers

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 I have come to give out sure 2O20 WAECbiology questions and answers. This article is a very sure expo to you which will help pass your 2O20 WAEC exams on biology.

Below are very complete 2O20 WAECbiology questions and answers. The secrets of passing this exam are to study, study and study harder.

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WAEC Biology Objectives and Theory Answers 2020

This 2O20 WAEC biology questions and answers is also divided into two sections (A & B). where A is usually objectives with possibly 60 questions. Section B is part II of this post.

Section A. obj

  1. Which of the following statement is NOT true of symbiosis?
  2. A) Symbionts must be living
  3. B) It is an association of ‘give and take’
  4. C) The association may involve two plants
  5. D) Association between two similar species
  6. E) Symbionts derive mutual benefit
  7. A person whose blood can be donated to all other people, must have the blood group
  8. A) O
  9. B) AB
  10. C) B
  11. D) A
  12. E) none of the abov
  13. If Benedict’s solution gives a positive result in a food test, the food contains
  14. A) sugar
  15. B) protein
  16. C) oil
  17. D) fat
  18. E) cellulose
  19. A surprising fact about sickle cell disease is that it
  20. A) affects only black people
  21. B) kills the patient
  22. C) is hereditary
  23. D) affects blood cells
  24. E) weakens the patient
  25. Nitrification means
  26. A) conversion of nitrates to nitrogen
  27. B) fixing nitrogen into plants
  28. C) conversion of nitrates to nitrites
  29. D) changing of ammonia to nitrities, then nitrates
  30. E) nitrogen cycle
  31. Which of the following statements is NOT true of menstruation?
  32. A) It occurs monthly
  33. B) The discharge contains amniotic fluid
  34. C) Its signifies no conception
  35. D) It involves the lining of uterus
  36. E) It may cause pains
  37. The tissue which connects a muscle to a bone is a
  38. A) cartiligae
  39. B) muscle fibre
  40. C) tendon
  41. D) ligament
  42. E) connecting fibre
  43. A fruit formed from a single flower having several free carpels is
  44. A) a multiple fruit
  45. B) a dry dehiscent fruit
  46. C) a dry indehiscent fruit
  47. D) a simple fruit
  48. E) an aggregate fruit
  49. If the anthers of a flower mature before the stigma, the condition is termed
  50. A) epigyny
  51. B) hypogyny
  52. C) protogyny
  53. D) protandry
  54. E) perigyny

1O. An instrument used in measuring the speed of wind is

  1. A) a barometer
  2. B) a wind gauge
  3. C) a wind vane
  4. D) an anemometer
  5. E) a hydrometer
  6. Spirogyra reproduces vegetatively by
  7. A) spore production
  8. B) fragmentation
  9. C) multiple fission
  10. D) budding
  11. E) binary fission
  12. Which of the following instruments is used to demonstrate the response of roots and shoots to gravity?
  13. A) Klinostat
  14. B) Manometer
  15. C) Porometer
  16. D) Potometer
  17. E) Photometer
  18. Milk protein is hydrolyzed by
  19. A) renin
  20. B) amylase
  21. C) lipase
  22. D) lactase
  23. E) pepsin
  24. The rate of transpiration of a leafy shoot would be highest under
  25. A) damp, cold, still air
  26. B) damp, warm, moving air
  27. C) dry, warm, moving air
  28. D) dry, cold, moving air
  29. E) dry, warm, still air
  30. What is name of the respiratory organ of the crab?
  31. A) Tubules
  32. B) Trachaea
  33. C) Spiracles
  34. D) Lungs
  35. E) Gills
  36. The two types of human tapeworm can be distinguished by the presence or absence of
  37. A) scolex
  38. B) hook
  39. C) head
  40. D) sucker
  41. E) proglottis
  42. All the following are digestive enzymes except
  43. A) bile
  44. B) lipase
  45. C) maltase
  46. D) pepsin
  47. E) ptyalin
  48. In a bakery, yeast is added to flour to make bread rise. This is possible because yeast produces
  49. A) alcohol
  50. B) oxygen
  51. C) carbon dioxide
  52. D) energy
  53. E) ethanol
  54. Accommodation of the human eye is best described as the
  55. A) ability to see distant objects
  56. B) movement of upper and lower eyelids
  57. C) focusing of near and distant objects
  58. D) changing of lens shape due to varying light intensities
  59. E) constant adjustment of the iris

2O. Normally any character shown by an organism is due to the effects of

  1. A) hormones and chromosomes
  2. B) chromosomes
  3. C) mutation
  4. D) hormones and genes
  5. E) genes and environment
  6. Which of the following animals is cold blooded?
  7. A) Cat
  8. B) Lizard
  9. C) Whale
  10. D) Bird
  11. E) Horse
  12. What is the genetic ratio of a cross between homozygous tall plant and a homozygous dwarf plant?
  13. A) 0 tall : 4 short
  14. B) 3 tall : 1 short
  15. C) 2 short : 2 tall
  16. D) 1 tall : 1 short
  17. E) 4 tall : 0 short
  18. Where is the food stored in yam plant?
  19. A) stem
  20. B) Bud
  21. C) Adventitous root
  22. D) Leaves
  23. E) Tap root
  24. Which of the following is the dental formula of man?
  25. A) i(2/2) c(0/1) pm(2/2) m(3/3)
  26. B) i(2/2) c(1/1) pm(2/0) m(3/3)
  27. C) i(2/2) c(1/1) pm(2/2) m(3/3)
  28. D) i(2/2) c(1/1) pm(3/3) m(2/2)
  29. E) i(2/2) c(1/1) pm(2/3) m(3/3)
  30. The kind of teeth used for tearing food materials is the
  31. A) fang
  32. B) canine
  33. C) premolar
  34. D) carnassial
  35. E) incisor
  36. Which of the following insects has an incomplete metamorphosis during its life circle?
  37. A) Butterfly
  38. B) Bee
  39. C) Mosquito
  40. D) House-fly
  41. E) Grasshopper
  42. The mushroom is an organism which feeds
  43. A) parasitically
  44. B) saprophytically
  45. C) holozoically
  46. D) symbiotically
  47. E) autotrophically
  48. What is the function of the contractile vacuole in paramecium?
  49. A) Produces enzymes
  50. B) Gets rid of excreta
  51. C) Stores and digest food
  52. D) Gets rid of excess water
  53. E) Controls movement
  54. Choose the sequence which represents the correct order of organisms in a food chain.
  55. A) Grass, snake, toad, grasshopper, hawk
  56. B) Grass, grasshopper, toad, snake, hawk
  57. C) Grass, grasshopper, snake, toad, hawk
  58. D) Grass, snake, grasshopper, toad, hawk
  59. E) Grass, toad, snake, grasshopper, hawk

3O. Which of the following is NOT a function of the liver?

  1. A) Regulation of blood sugar
  2. B) Storage of iron
  3. C) Formation of bile
  4. D) Breakdown of excess amino acids
  5. E) Excretion of urea from the blood
  6. If a baby is a female, her mother’s ovum must have been fertilized by a sperm carry the chromosome
  7. A) X
  8. B) XY
  9. C) XX
  10. D) YY
  11. E) Y
  12. Leguminous plants, e.g Mucana, are usually planted in cultivated farmlands because they
  13. A) enrich the soil with phoshates
  14. B) provide animals with food
  15. C) enrich the soil with organic nitrogen
  16. D) protect the soil from being over-heated
  17. E) protect the micro organisms in the soil
  18. During thunderstorms the energy of lightning discharge causes
  19. A) oxygen and nitrogen to combine
  20. B) more carbon dioxide to be formed
  21. C) nitrites to be converted to nitrates
  22. D) nitrates to be converted to nitrogen
  23. E) death
  24. A few grams of dried soil were first heated until red hot and then further heated until no more smoke was released. This experiment was to determine
  25. A) amount of water in soil
  26. B) percentage of water in soil
  27. C) presence of humus in soil
  28. D) resistance of laterities to heat
  29. E) release of smoke from the soil
  30. Oxygen from the atmosphere reaches the mammalian blood stream through one of the path indicated below. Indicate the correct path, a = mouth, b = trachea, c = bronchiole, d = nostril, e = bronchus, f = alveoli


  1. A) a → b → e → f → d
  2. B) b → d → f → e → c
  3. C) d → b → e → c → f
  4. D) b → a → f → e → c
  5. E) f → e → c → d → c
  6. Below are some group of diseases. Which group of diseases is caused by bacteria?
  7. A) Tuberculosis, smallpox
  8. B) Gonorrhoea, measles
  9. C) Tuberculosis, polio
  10. D) Sleeping sickness, measles
  11. E) Syphilis, gonorrhoea
  12. A mosquito which produces eggs which float, and whose larvae lie horizontal to the water surface, also rests at the angle on a vertical surface. This type of mosquito is
  13. A) Aedes
  14. B) Anopheles
  15. C) Culex
  16. D) Tiger mosquito
  17. E) none of the above
  18. The amount of water loss from a leaf can be detected using
  19. A) lime-water
  20. B) red litmus paper
  21. C) blue litmus paper
  22. D) blue cobalt chloride paper
  23. E) pink cobalt chloride paper
  24. In animals, cilia, flagella, pseudopodia and chaetae, can be used for
  25. A) reproduction
  26. B) fighting
  27. C) attachment to plants
  28. D) locomotion
  29. E) locating sensation

4O. Which of the following is NOT true of wind-pollinated flowers?

  1. A) A large amount of pollen produced
  2. B) Light smooth pollen grains
  3. C) Small inconspicuous flowers
  4. D) Scented petals
  5. E) Large pendulous anther
  6. Which of the following food substances is digested in the stomach?
  7. A) Carbohydrate
  8. B) Fats and oil
  9. C) Fats and proteins
  10. D) Proteins
  11. E) Carbohydrates and fats
  12. The conversion of excess amino acids into urea occurs in the
  13. A) Kidney
  14. B) pancreas
  15. C) villi
  16. D) liver
  17. E) spleen
  18. For pollination and fruit formation, the essential part(s) of the flower should be the
  19. A) corolla
  20. B) ovary
  21. C) pistil (gynoecium)
  22. D) ovules
  23. E) receptacle
  24. Which one of the following parts of the mammalian body is most closely associated with the production of urine?
  25. A) Malpighian capsule
  26. B) Urinary bladder
  27. C) Ureter
  28. D) Vas deferens
  29. E) Urethra
  30. A potometer is used to determine the rate at which a shoot
  31. A) respires
  32. B) sucks air bubbles
  33. C) loses weight
  34. D) absorbs water
  35. E) transpires
  36. A green plant growing in a compost pit is feeding
  37. A) holozoically
  38. B) parasitically
  39. C) saprophytically
  40. D) holophytically
  41. E) in none of the above ways
  42. The part of the cell solely responsible for respiration is the
  43. A) nucleus
  44. B) nucleolus
  45. C) mitochondria
  46. D) golgi apparatus
  47. E) endoplasmic reticulum
  48. The filament of spirogyra were put into equal volumes of sugar solutions X and Y. After 5 minutes, filaments from solution X had their cells contents rounded up while those from Y were unaffected. The experiment shows that
  49. A) solution X was stronger than Y
  50. B) solution Y was stronger than X
  51. C) Spirogyra used up the sugar in solution X
  52. D) solution X is good for stimulating sexual reproduction in Spirogyra
  53. E) solution Y was less contaminated than X
  54. Which part of the human brain is concerned with reflexes controlling the rate of heart beat and breathing?
  55. A) Medulla
  56. B) Cerebrum
  57. C) Cerebellum
  58. D) Pineal body
  59. E) Olfactory lobe

5O. Which of the following hormones is produced during fright or when agitated?

  1. A) Insulin
  2. B) Adrenalin
  3. C) Thyroxine
  4. D) Pituitrin
  5. E) Progesterone
  6. The following are connected with the movement of a reflex action

(1) Central Nervous,

(2) Muscles,

(3) Skin,

(4) Sensory Nerve,

(5) Motor Nerve.

  1. Which of the following sequences indicates a correct path?
  2. A) 1 → 2 → 3 → 4 → 5
  3. B) 2 → 1 → 4 → 5 → 3
  4. C) 3 → 4 → 1 → 2 → 5
  5. D) 4 → 1 → 5 → 2 → 3
  6. E) 3 → 4 → 1 → 5 → 2
  7. Biconcave lenses are used in the correction of an eye defect called?
  8. A) myopia
  9. B) colour blindnes
  10. C) old age
  11. D) hypermetropia
  12. E) weakening of ciliary muscles
  13. The center which controls respiratory activities in the mammalian brain is the
  14. A) cerebrum
  15. B) olfactory lobe
  16. C) pituitary organ
  17. D) cerebellum
  18. E) medulla
  19. A student trying to find out the order in which organisms appear on a cleared plot is studying one of the following
  20. A) Ecosystem
  21. B) Food chain
  22. C) Food web
  23. D) Succession
  24. E) Community
  25. An organism X lives entirely on the waste products in another organism Y. In this association X is a
  26. A) symbiont
  27. B) commensal
  28. C) saprophyte
  29. D) parasite
  30. E) epiphyte
  31. The tips of some rice seedlings were cut off while some were left intact. Both were covered with a container which had only one small hole to allow light through. After twenty-four hours it was observed that
  32. A) the cut tips was bent away from the light
  33. B) the cut tips bent towards source of light
  34. C) the intact tips bent away from the light
  35. D) the intact tips bent towards the light
  36. E) both tips bent away from light
  37. If three 30 cm lengths of glass tubes are tightly packed with clay, sand and loamy soils respectively and then stood in a beaker of water for one week, the level of water will be
  38. A) lowest in the tube with clay
  39. B) the same in all tubes
  40. C) lowest in the tube with loamy soil
  41. D) highest in the tube with sandy soil
  42. E) lowest in the tube with sandy soil
  43. In anaerobic respiration, glucose is converted to one of the following
  44. A) Carbon dioxide and water
  45. B) Carbon dioxide only
  46. C) Carbon dioxide and alcohol
  47. D) Alcohol and water
  48. E) water and acetic acid

6O. During excretion of urea there is also a corresponding re-absorption of water into the blood. This re-absorption takes place in the

  1. A) uriniferous tubules
  2. B) Bowman’s capsule
  3. C) glomerulus
  4. D) malpighian capsule
  5. E) renal artery
  6. If the bark and phloem tissue of a woody shoot are peeled off by ringing, the whole plant will eventually die because
  7. A) water does not reach the leaves
  8. B) water and salts remained below the ring portion
  9. C) there is a withdrawal of water from the root by soil
  10. D) manufactured food does not reach the roots
  11. E) the roots store too much water

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2 Comments on WAEC 2020 Possible Biology Questions and Answers

  1. So why u no write the answer


  2. Pls help with answer of all those questions


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