Biology Paper 1 Questions and Answers - Asumbi Girls Pre Mock Examinations 2023

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  1. Answer all the questions


  1. Name the part of a flower that develops into:
    1. Seed [1 mark]
    2. Fruit [1 mark]
  2. State two ways in which floating leaves of aquatic plants are adapted to gaseous exchange [2 marks]
  3. The diagram below represents a stage during cell division
    3 sauygduada
      1. Identify the stage of cell division [1 mark]
      2. Give two reasons for your answer in [a] [i] above [2 marks]
    2. Name the structure labeled M [1 mark]
    1. Distinguish between the terms [2 marks]
      Homodont and heterodont
    2. What is the function of the carnassial teeth [2 marks]
  5. A patient with blood group A was involved in a road accident and required urgent blood transfusion His relatives were invited to donate blood
    1. Name the compatible blood groups [2 marks]
    2. State why other blood groups were not compatible [2 marks]
  6. The flow chart shows a part of a food relationship in an ecosystem
    6 utgaytgdad
      1. Name the food relationship shown [1 mark]
      2. How many trophic levels are shown in the diagram [1 mark]
    2. What is the main source of energy in the ecosystem [1 mark]
  7. Name the only epidermal cell in plants that contain chloroplast [1 mark]
  8. The equation below represents a metabolic process that occurs in the mammalian lives 
    Amino Acids -------------------→ organic compound
                             Enzyme x
    1. Name the process that represents the above equation [1 mark]
    2. Identify the enzyme represented by x [1 mark]
    3.  What is the importance of the process to the mammal [1 mark]
    1. Name the carbohydrate that is stored in mammalian muscle [1 mark]
    2. What name is used to describe removal of indigestible and undigested food material from the alimentary canal [1 mark]
    1. Carl Linnaeus developed the taxonomic units of classification
      1. What is taxonomy [1mark]
      2. Why was the system of classification by Carl Linnaeus described as natural system of classification [2 marks]
  11. Phagocytes also called granulocytes or polymorphs are cells found in the blood that ingest pathogens and cell debris
    1. Why are they called polymorphs [1 mark]
    2. Name the cell organelle most abundant in phagocytes that enable them function effectively [1 mark]
  12. Name the:
    1. Material that strengthens xylem tissue [1 mark]
    2. Tissue that is removed when the part of a plant is ringed [1 mark]
  13. The diagram below represents a cell organelle
    13 auttgdada
    1. State the function of this organelle [1 mark]
    2. Name each of the parts A and B
      A [1 mark]
      B [1 mark]
  14. In which two ways do guard cells differ from other epidermal cells [2 marks]
    1. Through cellular respiration, the chemical energy stored in glucose molecule is converted into which specific molecule [3 marks]
    2. Name the substance that speed up biochemical reaction [1 mark]
  16. During germination and early growth, the dry weight of endosperm decreases while that of embryo increase explain [2 marks]
  17. The diagrams below show changes in the life cycle of flowering plants
    17 sycyzcsa
    1. Complete the table below by choosing the letters from the diagram which refers to each of the stages given [4 marks]



      Male gametophyte


      Tube nucleus


      Female gamete


      Male gamete

  18. State two characteristics of kingdom Monera that are not found in other kingdoms [2 marks]
  19. State three ways by which plants compensate for lack of the ability to move from one place to another [3 marks]
  20. State three physiological processes that are involved in movements of substances across the cell membrane [3 marks]
  21. If the human pancrease is not functional:
    1. Name the hormone which will be deficient [1 mark]
    2. Name the disease the human is likely to suffer from [1 mark]
  22. The oxidation state of a certain food is represented below by a chemical equation
    2C3 H2O 2N + 6O2 → (NH4)2 CO2 + 5CO2 + 5H2O
    1. Calculate the respiratory quotients [RQ] of the food substance [2 marks]
    2. Identify the food substrate [1 mark]
  23. The diagram below shows an apparatus used during collection of specimen
    23 autdguada
    1. Identify the apparatus [1 mark]
    2. What is the use of the apparatus named above [1 mark]
  24. State two physical factors in an ecosystem that affect the distribution of organisms [2 marks]
  25. A DNA strand has the following base sequence G C C T A G A T C A C
    What is the sequence of the
    1. Complementary DNA strand [1 mark]
    2. M-RNA strand copied from this DNA strand [1 mark]
  26. State three limitations of fossil records as evidence of organic evolution [3 marks]
  27. Explain the term “Resistance” as used in evolution of living organisms [2 marks]
  28. State the function of the following parts of a light microscope
    1. Body tube [1 mark]
    2. Diaphragm [1 mark]
  29. The table below shows analogies of gene mutations [3 marks]

    Intended message

    Actual message


    Buy me a skirt

    Buy me a shirt


    This is my team

    This is my mate


    Auntie is staying

    Auntie is straying

    Identify the type of gene mutation illustrated
  30. State two sources of variations [2 marks]
  31. Name the diseases caused by each of the following [2 marks]
    1. Plasmodium falciparum
    2. Entamoeba histolytica


    1. Ovule
    2. Ovary
  2. Aerenchyma tissue with large air spaces to store air.
    Large stomata found on the upper surface of the leaf
      1. Anaphase1
      2. Homologous chromosomes separate towards the poles
    2. Spindle fibres contract separating the homologous chromosomes
      Spidle fibre
    1. Homodont –teeth of the same size and shape 
      Heterodont –teeth of different size and shape 
    2. Special pre-molars with smooth sides and sharp edges to slice through flesh and crush bones
    1. B
    2. O –Universal donor since they have no antigens 
      A – Same blood group   hence no agglutination
      1. Food web
      2. Three 
    2. Sun
  7. Guard cells
    1. Deamination 
    2. Enzyme orginaze
    3. Removal of the excess amino acids 
    1. Glycogen
    2. Egestion
      1. Science of classification 
      2. Uses  evolutionary  relationship  between organism  and their  ancestor
      1. They  have  lobed nuclei 
      2. Lysosomes
    1. Lignin
    2. Phloem
    1. Packing  and transport  in  venicles  of material  such as  enzyme 
      Secretion of synthesized proteins, carbohydrates
      Process of cisternae
      Involved  in  lysosome  formation 
    2. A. Golgi Apparatus
      B. Golgi vesicles/ bodies
    • Guard cells have chloroplast hence photosynthesis, epidermal cells are transparent
    • Have thicker  inner  walls and thin  outer walls  for  differential  expansion  to facilitate opening and  closing  of the  stomata. 
    • Are bean shaped
    • Epidermal cells have uniformly thickened walls
    • Epidermal cells are rectangular flattened cells
    1. ATP-Adenosine triphosphate
      CO2-Carbon [IV] oxide
    2. Enzymes
  16. Food  stored  in the endosperm  was oxidized  to form  energy  for the process and also form  new  material for  growth  in the  embryo.
  17. Embryo grows and develops forming new issues that result in increase in weight



    Male  gametophyte


    Tube nucleus


    Female  gamete


    Male gamete


  18. Their nuclear material is not enclosed within a nuclear  membrane so the genetic material is not separated from the rest of the cell/Prokaryotic
    They do not have membrane bound organelles 
    • Plants   are able to synthesize their own food. 
    • Plants are able to use pollination rather than moving to seek mating partners.
    • Plants use seed and fruits dispersed to colonize new habitats.
    • Diffusion
    • Osmosis
    • Active transport
    1. Insulin, glucagon
    2. Diabetes mellitus, Hypoglycaemia
    1. RQ  = volume  of  carbon[IV] oxide produced 
                    Volume of oxygen consumed 
       5/6 =0.83
    2. Proteins
    1. Pitfall trap
    2. For catching crawling animals
    • Temperature; Humidity
    • Light ; Atmospheric pressure
    • Several missing links
    • Most organisms especially soft-bodied ones do not form fossils
    • Exposed fossils are usually destroyed by physical and chemical weathering 
    • Most animals are preyed upon.
  27. Some individuals in a population possess genes that have undergone mutations resulting in resistance against some chemicals. The mutations establish a population of resistant forms
    1. Holds   the eyepiece and  the revolving nosepiece
    2. An aperture that regulates the amount of light passing through the condenser to illuminate the specimen.
    • Substitution
    • Inversion 
    • insertion
    • Mutation
    • Crossing over during prophase of meiosis
    • Sexual reproduction [fertilization]
    • Independent assortment of chromosomes during metaphase of meiosis 1
    1. Malaria
    2. Amoebic dysentry


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