BIOLOGY PAPER 3 - 2017 MURANG'A MOCK EXAMINATION

QUESTIONS

1.  
   1. Carryout food tests for solution Y and X using the reagents provided. (6mks)
      

      Solution	Food substance	Procedure	Observation	Conclusion
      Solution X
      Solution Y

   2. Tie one side of the visking tubing with one of the threads provided. Pour 5ml of solution X in the visking tubing and tie the other end with the remaining piece of thread. Immerse the visking tubing in solution Y in the beaker and leave the set up for 20 minutes. After 20 minutes perform food test using the solution in the visking tubing and solution in the beaker and record your result  in the table below. (3mks)
      

      Solution	Food substance	procedure	observation	conclusion
      Solution in visking tubing
      Solution in the beaker

   3. Which process was being investigated.(1mk)
   4. Account for the results obtained(3mks)
   5. state two importances of the process above in living organisms.(2mk)

2. Study the diagrams set A₁, set E₁, set M₁ and set B carefully and answer the questions below
   
   1. State the conditions under which each set up was grown.            (3mks)
      Set A₁
      Set E₁
      Set B 
   2.  
      1. Name the phenomenon exhibited by seedlings in set E₁(1mk)
      2. Give a reason why plants exhibit the phenomenon named in (b) (i) above   (1mk)
   3.  
      1. Name the response exhibited by the seedlings in set B.       (1mk) 
      2. Explain how the response named in (c) (i) above occurred  (2mks)
   4.  
      1. State the type of germination exhibited by seedlings in set A₁ and set M₁. (2mks)             
         Set A₁ 
         Set M₁
      2. Give a reason for your answer in (d) (i) above    (2mks)
         Set A₁
         Set M₁ 
   5.  
      1. State the mode of dispersal in set A above when mature. (1 mk)
      2. Name the type of fruit formed by M1 on maturity.     (1 mk)

3. Study the photographs below and hence answer the questions that follow
   
   
   1. To which phylum does organisms x,y and z belong to. (1 mark)
   2. Name the classes to which X, Y and Z belongs to.     (3 marks)
   3. Give two important economic roles of specimen Y.    (2 marks)
   4. Give one harmful effect of specimen X to animals.    (1 mark)
   5. With reasons identify two modes of locomotion of specimen Y. (4 marks)