Biology Paper 3 Questions and Answers with Confidential - Kapsabet Mock Exams 2021/2022

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INSTRUCTIONS TO CANDIDATES

  1. Answer all the questions.
  2. Spend the first 15 minutes of the 1 ¾ hours allowed for this paper reading the whole paper carefully before commencing your work.
  3. Answers MUST be written in the spaces provided in the QUESTION PAPER ONLY.

 

  1. You are provided with olive oil, liquids labeled L1 and L2, and an Irish potato. Label test tubes A and B. Place 2cm3 of water into each test tube. Add 8 drops of olive oil into each test tube. To test tube A, add 8 drops of liquid L. Shake both test tubes. Allow to stand for 2 minutes.
    1.      
      1. Record your observations (2 marks)
        Test Tube A
        Test Tube B
      2. Name the process that has taken place in test tube A (1 mark)
      3. State the significance of the process named in (a) above (1 mark)
      4. Name the digestive juice in humans that has the same effect on oil as liquid L1 (1 mark)
      5. Name the region of the alimentary canal into which the juice is secreted (1 mark)
    2.         
      1. Label two test tubes C and D place 2cm3 of liquid L2 into each test tube. Add a drop of iodine solution into each test tube. Record your observations. (1 mark)
      2. Suggest the identity of L2 (1 mark)
      3. Cut a cube whose sides are 1cm3 from the Irish potato. Crush the cube to obtain a paste. Place the paste into a test tube labeled C. add 2cm3 of amylase solution. Leave the set up for at least 30 minutes.
        Record your observations (2 marks)
        C ………………………………………………………………………………………………………
        D ………………………………………………………………………………………………………
      4. Account for the result in (b)(iii) above (2 marks)
    3. Cut another cube whose sides are 1cm from the Irish potato. Crush the cube. Place the crushed paste into a test tube. Carry out food test with reagents provided. Record your procedure and results.
      Procedure: (1 mark)
      Results: (1 mark)
  2. You are provided with specimen K. Use it to answer the questions that follow
    1. Cut the specimen K longitudinally. Draw one of the sections (4marks)
    2. With a reason state the agent of pollination (1mark)
    3. The photographs labelled Q, R,and S are sections of some plant parts.
      1
      1. Name the type of placentation in the specimens shown in photographs Q, R and S (3 marks)
        Q………………………………………………………………………………………………….
        R………………………………………………………………………………………………….
        S………………………………………………………………………………………………….
      2. Giving a reason in each case, name the mode of dispersal of the specimen in photograph Q and S (4mark)
        Q
        Mode……………………………………………………………………...……………………………..
        Reason …………………………………………………………………………………………………
        S
        Mode………………………………..……………………………………………………………………..
        Reason………………………………………………………………………………………………………
  3. Study photographs shown below then answer the questions.
    2
    3
    1. State the type of evolution represented by structures Q1, R1 and S1. (1mk)
    2. Explain the type of evolution identified in (a) above. (1mk)
    3. Give the evolution term used to describe structures;
      1. Q1, R1 and S1. (1mk)
      2. A1, B1 and C1. (1mk)
    4. what type of evolution is illustrated by the limbs (A1, B1 and C1)? (1mk)
    5.      
      1. Name classes for organisms labeled Q, R and S.
        Q……………………………………………………………...……………………… (1mk)
        R………………………………………………………………………...…………… (1mk)
        S…………………………………………………………………………………...… (1mk)
      2. Give two reasons for placing S in the class above (2mks)
    6.    
      1. Suggest the diet of animals B and R.
        B…………………………………………..………………………………………… (1mk)
        R………………………………………………….……………………………….... (1mk)
      2. How is beak of animal B adapted to its function? (2mks)

CONFIDENTIAL
The information contained in this paper is to enable the head of the school and the teacher in charge of Biology to make adequate preparations for the Biology practical examination.

  • Each Candidate will Require:-
  • L1 – Sodium hydrogen carbonate solution supplied with a dropper.
  • L2 – starch solution supplied with a dropper
  • (Olive) oil supplied with a dropper.
  • Benedict’s solution supplied with a dropper.
  • Iodine solution supplied with a dropper
  • 5 clean test tubes.
  • Irish potato
  • Scalpel
  • Amylase solution
  • 4 labels
  • Motar and pestle
  • Distilled water in a wash bottle
  • A 30cm transparent ruler
  • 10ml measuring cylinder
  • Means of timing e.g. clock / stop watch.
  • Means of heating.
  • Hibiscus flower marked K


MARKING SCHEME

  1.      
    1.        
      1. Test Tube A
        • Oil is broken into small or tiny droplets / oil is emulsified;
        • Oil is suspended / spread throughout the liquid / cloudy suspension;
          (Any 1, 1 mark)
          Test Tube B
        • Oil floats on water / no mixing / two separate layers / two immiscible layers;
      2. Emulsification;
      3. To increase surface area for enzyme / activity / of lipases;
      4. Bile;
      5. Duodenum;
        Nb: (v) is tied to (iv)
    2.    
      1. Blue black color / colouration;
      2. Starch solution;
      3. C - Blue black colour disappears / fades / solution turns brown / yellow;
        D – Blue black colour remains;
      4. Enzyme amylase breaks down / hydroses / converts / digests starch into sugars reducing sugars / maltose; those do not give blue black colour with iodine;
    3. Procedure
      To a little of the paste in a test tube, add benedicts solution and heat;
      Results
      Colour changes to yellow / orange / brown precipitate;
  2. You are provided with specimen K. Use it to answer the questions that follow
    1. Cut the specimen K longitudinally. Draw one of the sections 4 marks
    2. With a reason state the agent of pollination 2 Marks
      Insect
      Bright coloured petals to attract insects
      Scented and produce nectar that attract insects that feed on nectar
      Pollen grains are relatively large, heavy and rough so as to stick onto the body of the insect
    3. The photographs labelled Q, R and S are sections of some plant parts.
      4
      1. Name the type of placentation in the specimens shown in photographs Q, R and S (3 marks)
        Q Marginal placentation
        R Axile/ central placentation
        S Parietal placentation
      2. Giving a reason in each case, name the mode of dispersal of the specimen in photograph Q and S (4mark)
        Q
        Mode - Self-dispersal
        Reason - Fruits are found inside a pod. The pods contains lines of weakness
        S
        Mode - Animal
        Reason - Succulent and brightly coloured.
  3.         
    1. convergent evolution
    2. Different structures with different embryonic origins are modified to perform similar functions
    3.    
      1. analogous structures
      2. Homologous structures
    4. divergent evolution/ adaptive radiation
    5. Q…..…Insecta; R……Aves; S……Mammalia
    6.      
      1. B………flesh; R……nectar from flowers
      2. Strong, curved and sharp; to rip flesh from bones.

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