WAEC - Biology (2021)

  • 1
    Which of the following organelles is common to both plant and animal cells
    Trả lời
    (C)
    Cell membrane
  • 2

    The sections in X and Y respectively, are

    Trả lời
    (B)
    transverse and longitudinal
  • 3

    The fruit that has the illustrated sections is a

    Trả lời
    (A)
    hesperidium
  • 4

    The structure labelled I is associated with

    Trả lời
    (B)
    asexual reproduction
  • 5

    The structure labeled II is the

    Trả lời
    (D)
    sporangium
  • 6

    Which of the following statements about the structure labeled III is correct?

    Trả lời
    (A)
    secretes digestive enzymes into the substrate
  • 7

    The level of organization of the organism is

    Trả lời
    (B)
    cell
  • 8

    The organism belongs to the Phylum

    Trả lời
    (C)
    Euglenophyta
  • 9
    A plant cell placed in a solution with a higher water potential will
    Trả lời
    (B)
    enlarge and become turgid.
  • 10
    Offspring formed by sexual reproduction exhibit more variation than those formed by asexual reproduction because 
    Trả lời
    (B)
    gametes of parents have different genetic composition
  • 11
    Radius and ulna are bones of the?
    Trả lời
    (D)
    lower arm
  • 12
    The blood vessel which carries blood from the alimentary canal to the liver is the?
    Trả lời
    (C)
    hepatic portal vein
  • 13

    The diagram above is an illustration of the longitudinal section of a mammalian organ. Study it and answer this question.

    Which of the labeled parts is the cortex?

    Trả lời
    (D)
    IV
  • 14

    The diagram above is an illustration of the longitudinal section of a mammalian organ. Study it and answer this question.

    What is the main function of the organ?

    Trả lời
    (A)
    Excretion
  • 15
    Detoxification of urea takes place in the?
    Trả lời
    (C)
    liver
  • 16
    Which of the following hormones is suddenly secreted into the bloodstream of a frightened person?
    Trả lời
    (B)
    adrenaline
  • 17
    The temperature control centre in mammals is located in the?
    Trả lời
    (B)
    hypothalamus
  • 18

    The diagram above is an illustration of a type of eye defect in humans. Study it and answer this question.

    The eye defect illustrated in the diagram is?

    Trả lời
    (D)
    myopia
  • 19

    The diagram above is an illustration of a type of eye defect in humans. Study it and answer this question.

    The eye defect can be corrected by the use of?

    Trả lời
    (B)
    concave lens
  • 20
    How many gametes are produced in the pollen grain of a flowering plant before fertilization?
    Trả lời
    (B)
    two
  • 21
    Which of the following organisms does not undergo incomplete metamorphosis?
    Trả lời
    (C)
    butterfly
  • 22
    An enzyme reaction may begin to decline when?
    Trả lời
    (B)
    the ph of the medium is altered
  • 23

    The diagram above is an illustration of the growth of a plant in a water culture. After a few days, the solution turned green and the plant died. Use this to answer this question.

    What precaution should have been taken to prevent the solution from turning green?

    Trả lời
    (C)
    cover the culture vessel with opaque paper
  • 24

    The diagram above is an illustration of the growth of a plant in a water culture. After a few days, the solution turned green and the plant died. Use this to answer this question.

    The death of the plant was likely caused by?

    Trả lời
    (C)
    algal growth in the solution that used up the nutrients
  • 25
    Which of the following factors is not necessary for photosynthesis?
    Trả lời
    (C)
    wind
  • 26
    Autotrophic nutrition is a process whereby an organism obtains food 
    Trả lời
    (B)
    by synthesizing simple substances using energy
  • 27
    The process that takes place at the light stage of photosynthesis is?
    Trả lời
    (A)
    splitting of water molecules to form hydrogen ions
  • 28

    The diagram above is an illustration of the foot of an animal.

    The adaptation of this type of foot is that it is?

    Trả lời
    (B)
    used as a paddle for swimming
  • 29
    The following organisms are examples of carnivorous plants except.
    Trả lời
    (A)
    gloriosa
  • 30
    Plants and animals of an ecosystem make up a?
    Trả lời
    (C)
    community
  • 31
    Rabbits cannot survive in an aquatic habitat because they have 
    Trả lời
    (B)
    no gills
  • 32

    The illustration below is a food chain.

    Grass→grasshopper→domestic fowl→hawk

    What would happen if the population of domestic fowl decreases?

    Trả lời
    (C)
    grasshoppers would increase
  • 33
    Which of the following features is a characteristic of aquatic plants possession of ?
    Trả lời
    (D)
    succulent stem
  • 34
    An association between living organisms in which one organism lives on and feeds at the expense of the other organism is known as?
    Trả lời
    (C)
    parasitism
  • 35
    When a large number of organisms share limited resources, the result is?
    Trả lời
    (D)
    competition
  • 36

    Which of the following behaviours is correctly matched with the corresponding diseases?

     

     

    Trả lời
    (D)
    Eating uncooked meatf/fdysentery, cholera. food poisoning.
  • 37
    Endangered species are organisms that are?
    Trả lời
    (B)
    likely to disappear from the surface of the earth
  • 38
    Which of the following practices is a wildlife conservation method?
    Trả lời
    (D)
    discouraging poaching
  • 39
    Which of the following resources cannot be conserved?
    Trả lời
    (D)
    garbage
  • 40

    The diagrams above are illustrations of types of comb found in domestic fowl. Study them and answer this question.

    The types of comb show ?

    Trả lời
    (A)
    variation
  • 41

    The diagrams above are illustrations of types of comb found in domestic fowl. Study them and answer this question.

    Which factor is most likely responsible for the various types of comb?

    Trả lời
    (B)
    genetics
  • 42
    Which of the following statements about mitosis is not correct?
    Trả lời
    (D)
    Four daughter cells are produced
  • 43
    A mixture of blood with antigen A and blood containing antibody a will?
    Trả lời
    (A)
    lead to agglutination
  • 44
    Plants suitable for experiments in genetics must not 
    Trả lời
    (D)
    produce one generation in a large period
  • 45
    Which of the following statements about sickle cell anaemia is correct?
    Trả lời
    (C)
    two sickle cell carrier parents may have a sickling child