BIOLOGY PAPER 3 - 2017 KITUI MOCK EXAMINATION

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BIOLOGY PAPER 3 Marking Scheme - 2017 KITUI MOCK EXAMINATION

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You are provided with a potato labelled R. Cut 4 equal pieces of the potato about 1cm³.
1. Place one piece in a test-tube and label it A.
2. Place a second piece onto a white tile or petri-dish and crush it into a paste using a motor or a glass rod. Put it into a second test-tube and label it B.
3. To each of the two test tubes, add 2cm³ of hydrogen peroxide.
  1. Record your observations. (2 marks)
    Put a third piece of potato onto the white tile and crush it into a paste using the motor and the pestle. Put it into a third test tube and label it C.
    Add some little water to the paste and boil it for about 10 minutes. Let it cool.
    Add 2cm³ of hydrogen peroxide.
  2. Record your observations. (1 mark)
  3. Explain the results in (a) and (b) above. (4 marks
  4. Crush the fourth piece of potato and put it into a test-tube, add 2cm³ of hydrogen peroxide to it. Test the gas produced and record your observations. (1 mark)
  5. Make a conclusion based on results in (d) above. (1 mark)
  6. Write a word equation for the reaction that produces the gas. (1 mark)
  7. Where in your body does such a reaction occur? (1 mark)
  8. What is the importance of such a reaction in the body? (1 mark)

You are provided with specimens labelled A, B, C, D, E, F and G.

A dichotomous key shown below can be used to identify them
1. 1. Jointed legs present ------------------------------------- go to 2
  2. Jointed legs absent -------------------------------------- go to 6
2. 1. Three pairs of legs -------------------------------------- go to 3
  2. More than three pairs of legs -------------------------- go to
3. 1. Wings present ------------------------------------------- go to 4
  2. Wings absent -------------------------------------------- Bedbug
4. 1. Two pairs of wings ------------------------------------- Batesian butterfly
  2. One pair of wings --------------------------------------- Apis mellifera
5. 1. Antennae present ---------------------------------------- Crab
  2. Antennae absent ----------------------------------------- Scorpion
6. 1. Shell present --------------------------------------------- Snail
  2. Shell absent ---------------------------------------------- go to 7
7. 1. Prominent clitellum ------------------------------------- Earthworm
  2. No clitellum visible ------------------------------------- Leech
    1. Use the dichotomous key to identify each of the animal specimens provided.
      In each case show the sequence of steps that you followed to arrive at the identity of each specimen. (7 marks)
      
      Specimen Steps followed Identity
      
      A
      
      B
      
      C
      
      D
      
      E
      
      F
      
      G
    2. 1. Name the class to which specimen D belongs. (1 mark)
      2. Name two observable features used to classify specimen D in (b) (i) above. (2 marks)
    3. 1. Name the type of skeleton found in organism A. (1 mark)
      2. Name one function of the skeleton found in c(i) above. (1 mark)
    4. State two economic importance of specimen A in an ecosystem. (2 marks)

Figure 1.1 below shows the lower surface of a dicotyledonous leaf.
1. Make a labelled drawing of the leaf.
  Your drawing should be of the same size as that shown in the figure 1.1 (6 marks)
2. Figure 1.2 below shows part of the lower surface of the leaf in figure 1.1 as seen under a light microscope.
  1. On the figure 1.2, label using lines two different types of cells. (2 marks)
  2. On the figure 1.2 put a circle around two of the cells where chloroplasts are normally present. (2 marks)
3. Suggest how you could determine the number of stomata present on one surface of a whole leaf.(4 marks)

BIOLOGY PAPER 3 - 2017 KITUI MOCK EXAMINATION

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Specimen	Steps followed	Identity
A
B
C
D
E
F
G