IB Biology Mock Questions - Paper 1

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100 Questions - Developed by:
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This quiz was compiled from questions from past IB Biology International exams.

My intention in creating it is to give students the opportunity to practice the real exam as a mock test. When you finish this, you'll have an idea of how you'll do on the real exam, and whether or not you might need to study more. Good luck! P.S.: Not every question has a picture.

  • 1
    Which phylum includes plants with rhizoids - spores produced in a capsule and a height below 0.5 meters?
  • 2
    Which types of molecule are shown in the diagram? (See graph for choices.)
    Which types of molecule are shown in the diagram? (See graph for choices.)
  • 3
    What is the composition of eukaryotic chromosomes?

  • 4
    The diagram below shows a motor neuron.
    What are the structures indicated by X, Y and Z?
    (See graph to select possible answers.)
    The diagram below shows a motor neuron. What are the structures indicated by X, Y and Z? (See graph to select possible answers.)
  • 5
    Why are antibiotics effective against pathogenic bacteria?
  • 6
    What role does the medulla of the brain have in controlling the heart rate?

  • 7
    What can be predicted from the histogram comparing the mass of McIntosh apples and the mass of Gravenstein apples?
    (See graph)
  • 8
    What are the increasing levels of progesterone responsible for during the female menstrual cycle?
  • 9
    If a woman has three male offspring, what is the probability that her next child will be female?
  • 10
    Which vessel carries deoxygenated blood from the heart to the lungs?

  • 11
    What information about sample data is shown in error bars?
  • 12
    What must be present for a human fetus to develop into a normal male? (See graph to select possible answers.)
    What must be present for a human fetus to develop into a normal male? (See graph to select possible answers.)
  • 13
    Which blood group genotype shows codominance?
  • 14
    Which parts of this nucleotide would bond covalently with other nucleotides in a DNA double helix? (See graph)
    Which parts of this nucleotide would bond covalently with other nucleotides in a DNA double helix? (See graph)
  • 15
    What might increase in Arctic ecosystems as a result of rising global temperatures?
  • 16
    Which population group has the greatest variation in height? (See graph to select possible answers.)
    Which population group has the greatest variation in height? (See graph to select possible answers.)

  • 17
    What is a plasmid?
  • 18
    A victim of an accident can feel a stimulus to the toes, but cannot move them. Which of the indicated cuts could be causing the damage?
  • 19
    Which blood vessels have a thick muscular walls that can resist pressure and assist in pumping blood?
  • 20
    Enzyme activity has been measured for two enzymes at different pH values. At which pH is one enzyme optimal and other denatured?

  • 21
    Which one describes antigens?
  • 22
    Though a single nerve cell does not think, millions of them organized as a brain results in thinking. What kind of property does thinking represent?
  • 23
    How much energy is stored in 1 kg of body fat compared to 1 kg of glycogen?
  • 24
    Which nucleic acids are directly involved in transcription?
  • 25
    Where could an action potentially occur in a motor neuron?
  • 26
    Which structure directly absorbs nutrient molecules from the digestive tract?

  • 27
    What process forms triglycerides?
  • 28
    Which of these terms describes genetically identical organisms derived from a single parent?
  • 29
    Which of these terms describes similar structures found in animals with a common ancestry?
  • 30
    Which substances are made during photosynthesis, and store energy that can be used by cells?

  • 31
    The bar chart shows the mean length (in cm) of two lizard species. The error bars represent the standard deviation. What can be understood from the chart?
    The bar chart shows the mean length (in cm) of two lizard species. The error bars represent the standard deviation. What can be understood from the ch
  • 32
    What is the body's response to low blood glucose levels?
  • 33
    What is a population?
  • 34
    What is dissolved in blood plasma?
  • 35
    What identifies plant cells and animal cells? (See graph to select possible answers.)
    What identifies plant cells and animal cells? (See graph to select possible answers.)
  • 36
    What identifies the structure and function of flagella and pili? (See graph to select possible answers.)
    What identifies the structure and function of flagella and pili? (See graph to select possible answers.)
  • 37
    The diagram shows the changes in membrane potential during an action potential. (See graph to select possible answers.)
    The diagram shows the changes in membrane potential during an action potential. (See graph to select possible answers.)
  • 38
    The diagram below shows the human heart. (See graph to select possible answers.)
    The diagram below shows the human heart. (See graph to select possible answers.)
  • 39
    What are examples of greenhouse gases?
  • 40
    What is light energy used for in photolysis?
  • 41
    What is "naked DNA"?
  • 42
    The following shows a diagram of a food web.
    Which members of this food web are tertiary consumers?
    (See picture for diagram.)
    The following shows a diagram of a food web. Which members of this food web are tertiary consumers? (See picture for diagram.)
  • 43
    What action(s) can phagocytes perform?
  • 44
    Which expected effect of temperature increase on Arctic ecosystems will increase carbon dioxide in the atmosphere?
  • 45
    Which molecule is a monosaccharide?
  • 46
    When might a favorable variation become unfavorable?
  • 47
    Hormone levels in the blood of a woman during a 28-day menstrual cycle are shown in the graph.
    What are the hormones? (See graph to select possible answers.)
    Hormone levels in the blood of a woman during a 28-day menstrual cycle are shown in the graph. What are the hormones? (See graph to select possible an
  • 48
    What is the definition of cell respiration?
  • 49
    The following shows a micrograph.
    In what order do the events in mitosis occur? (See graph)
    The following shows a micrograph. In what order do the events in mitosis occur? (See graph)
  • 50
    Which DNA has identical base pair sequences?
    (See graph for possible events.)
  • 51
    What evidence supports the cell theory?
  • 52
    During which process is messenger RNA (mRNA) formed?
  • 53
    Which is a long-term effect of the human immunodeficiency virus (HIV) on the immune system?
  • 54
    What is the phylum of the organism?
    (See graph.)
    What is the phylum of the organism? (See graph.)
  • 55
    Which compound is inorganic?
    (See graph for possible answers.)
    Which compound is inorganic? (See graph for possible answers.)
  • 56
    In the carbon cycle, which pair shows the correct change in atmospheric composition?
    (See graph for possible answers.)
    In the carbon cycle, which pair shows the correct change in atmospheric composition? (See graph for possible answers.)
  • 57
    Which comparable features provide evidence for evolution?
  • 58
    During expiration, how does air pressure in the lungs compare with atmospheric pressure?
  • 59
    When could non-disjunction occur?
  • 60
    Which structure synthesizes proteins for use primarily within the cell?
    (See graph for diagram and possible answers.)
    Which structure synthesizes proteins for use primarily within the cell? (See graph for diagram and possible answers.)
  • 61
    What is the difference between dominant, recessive and codominant alleles?
    (See graph for possible answers.)
    What is the difference between dominant, recessive and codominant alleles? (See graph for possible answers.)
  • 62
    Which are functions of lipids?
  • 63
    The following shows a pedigree chart. What type of inheritance is shown in the pedigree chart?
    (See graph.)
    The following shows a pedigree chart. What type of inheritance is shown in the pedigree chart? (See graph.)
  • 64
    Which genotypes are possible when a male with blood group AB and a female with blood group O have offspring?
  • 65
    Which property of cells is evidence for the cell theory?
  • 66
    Which are functions of membrane proteins?
  • 67
    What are features of the enzyme amylase?
    (See graph for possible answers.)
    What are features of the enzyme amylase? (See graph for possible answers.)
  • 68
    What causes heritable variation in species?
    (See graph for possible situations.)
    What causes heritable variation in species? (See graph for possible situations.)
  • 69
    The diagram below shows the female reproductive system. What are the structure indicated by X, Y and Z?
    (See graph for diagram and possible answers.)
    The diagram below shows the female reproductive system. What are the structure indicated by X, Y and Z? (See graph for diagram and possible answers.)
  • 70
    What indicates overall population changes?
  • 71
    What is the dunction of proteins in passive transport?
  • 72
    Which is the chemical structure that represents fatty acids and carbohydrates?
    (See graph for diagram and possible answers.)
    Which is the chemical structure that represents fatty acids and carbohydrates? (See graph for diagram and possible answers.)
  • 73
    How is the sequence of DNA conserved?
  • 74
    The graph shows a predicted population growth curve when small number of rats are accidentally introduced to an island where they do not naturally occur. When is there most likely to be a balance between natality and mortality.
    (See graph for diagram and possible answers.)
    The graph shows a predicted population growth curve when small number of rats are accidentally introduced to an island where they do not naturally occ
  • 75
    How can forensic scientists obtain sufficient data from one hair follicle to make a reliable identification by DNA profiling?
  • 76
    Which letter indicates the time when the sodium-potassium pump reestablishes the resting state?
    (See graph for diagram and possible answers.)
    Which letter indicates the time when the sodium-potassium pump reestablishes the resting state? (See graph for diagram and possible answers.)
  • 77
    Which punnet grid provides evidence of multiple alleles?
    (See graph for diagram and possible answers.)
    Which punnet grid provides evidence of multiple alleles? (See graph for diagram and possible answers.)
  • 78
    How does the inhalation phase of ventilation occur?
  • 79
    Study the diagram of the simplified feedback mechanisms below. What combination would correctly show a simple feedback mechanism for temperature regulation?
    (See graph for diagram and possible answers.)
    Study the diagram of the simplified feedback mechanisms below. What combination would correctly show a simple feedback mechanism for temperature regul
  • 80
    What is a relationship between cell respiration and ventilation in humans?
  • 81
    What causes cell differentiation in multicellular organisms?
  • 82
    What characteristic(s) of water allow(s) effective transport of nutrients around the body by blood?
    (See graph for possible situations.)
    What characteristic(s) of water allow(s) effective transport of nutrients around the body by blood? (See graph for possible situations.)
  • 83
    What is light energy used for in photosynthesis?
  • 84
    Where do motor neurons conduct impulses from and to?
  • 85
    In ecology, how is community defined?
  • 86
    After gene transfer between species, what ensures that the amino acid sequence of the polypeptide made using the transferred gene remains unchanged?
  • 87
    How can a change in pH stop an enzyme-catalysed reaction from occurring?
  • 88
    What is a difference between prokaryotic cells and eukaryotic cells?
  • 89
    What is the correct site of the anaerobic respiration in yeast and one of its end products?
    (See graph for possible answers.)
    What is the correct site of the anaerobic respiration in yeast and one of its end products? (See graph for possible answers.)
  • 90
    What is the trophic level of the Leopard seal?
    (See graph for diagram and possible situations.)
    What is the trophic level of the Leopard seal? (See graph for diagram and possible situations.)
  • 91
    What occurs during gene mutation?
  • 92
    Which structures have a phospholipid bilayer?
    (See graph for possible situations.)
    Which structures have a phospholipid bilayer? (See graph for possible situations.)
  • 93
    What type of organism is growing on the surface of this dead wood?
    (See graph for the image.)
    What type of organism is growing on the surface of this dead wood? (See graph for the image.)
  • 94
    What would allow inhalation to occur during ventilation?
    (See graph for possible answers.)
    What would allow inhalation to occur during ventilation? (See graph for possible answers.)
  • 95
    Which sequence of taxonomic group goes from largest to smallest?
    (See graph for possible answers.)
    Which sequence of taxonomic group goes from largest to smallest? (See graph for possible answers.)
  • 96
    How many trophic levels are there in the shortest and longest food chains that end with Lake Trout?
    (See graph for diagram and possible answers.)
    How many trophic levels are there in the shortest and longest food chains that end with Lake Trout? (See graph for diagram and possible answers.)
  • 97
    Which is/are involved in the control of heart rate?
    (See graph for possible situations.)
    Which is/are involved in the control of heart rate? (See graph for possible situations.)
  • 98
    Which usually takes the most time in the cell cycle?
  • 99
    What can be found in plant cells, but not those of animals?
  • 100
    The cell theory states that cells come from preexisting cells. What biological process allows this to occur?

Comments (3)

autorenew

1348 days ago
Item 76: The voltage-gated delay rectifiers K-channels and not the Na+/K+ pump are responsible of membrane repolarization
1357 days ago
100 questionnaires! 100! 😱😱😱😱🤯🤯🤯🤯 this is INSANE!!!!!!
1371 days ago
There are several questions missing pictures