Biology Paper 3 Questions - Maranda Pre-Mock Examinations 2022

QUESTIONS

1. You are provided with olive oil, liquids labeled L, and L2, and an Irish potato. Label test tubes A and B. Place 2cm 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 made in the test tubes A and test tube B Test Tube A (1mark)
      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 L (1 mark)
      5. Name the region of the alimentary canal into which the juice is secrete (1 mark)
   2.      
      1. Label two test tubes C and D place 2cm 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 1 cm 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 (1mark)
      4. Account for the result in (b)(iii) above (2marks)
      5. Cut another cube whose sides are 1 cm 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: (2marks)
         Results: (1mark)
2. Study the photographs shown below then answer the questions that follow.
   
   
   1. State the type of evolution represented by structures Q1, R1, and S1. (1mark)
   2. Explain the type of evolution identified in (a) above (1 mark)
      
      1. Q1, R1 and S1:
      2. A1, B1, and C1: (1mark)
   3.        
      1. What type of evolution is illustrated by the limbs (A1, B1 and C1) (1mark).
      2. Name the class for each Q, R and S. (3marks)
      3. Give one observable reasons for your answer for class S (1mark)
      4. Suggest the diets of animals B and R (2marks)
      5. How is beak of animal B adapted to its function (1 mark)
3. Study the specimens provided then answer the questions below
   
   
   1. Name the parts labeled A1, B1, C1 and C3 (4marks)
   2. Fill in the table below with appropriate agent of dispersal and give a reason. (2mark)
      

      specimen	agent of dispersal	reason
      A

   3. How does part C2 adapt Specimen C to its agent of dispersal? (1 mark)
   4. Explain why Specimen A is important in a child's diet. (1mark)
   5. The diagram below represents two mature parasitic worms, labelled A and B, of the species Schistosoma mansoni that causes bilharzia
      
      
      1. With a reason, identify the male and the female worm in the diagram above. (3marks)
      2. Name two hosts, primary and intermediate, for these parasitic worms. (2marks)
         Primary host
         Intermediate host
      3. State one way of controlling the spread of bilharzia (1marks)