Biology Paper 3 - CATHOLIC DIOCESE OF KERICHO (CDK) EXAMS – 2018 PRE-MOCK WITH MARKING SCHEME

231/3
BIOLOGY
PAPER 3
PRACTICAL
March 2018
1 ¾ HOURS

CATHOLIC DIOCESE OF KERICHO (CDK) EXAMS – 2018
PRE-MOCK
BIOLOGY PAPER 3
TIME: 1 ¾ HOURS

INSTRUCTIONS TO CANDIDATES

1. Answer all the three questions in the spaces provided
2. You are required to spend the first 15 minutes of the 1 ¾ hours allowed for this paper reading the whole paper carefully before commencing your work.

1.  
   1. Study the diagrams T1 and S1 carefully and answer the following questions:
      
      
      
      
      1. Name the parts labeled S2, S3, S4, S5 and S6. (5mks)
      2. Name the parts labeled T2, T3, T4 and T5. (4mks)
      3. Complete the following table showing the type of fruit and reasons for each answer
         

         Specimen	Type of fruit	Reasons
         S1
         T1

      4. Complete the table below showing method of dispersal and reasons for each answer.
         

         Specimen	Method of dispersal	Reasons
         S1
         T1

   2. You are provided with a fruit labeled V.
      1. Cut a transverse section through specimen V. Draw and label of the cut surfaces. (4mks)
      2. State the type of placentation of specimen V. (1mk)
      3. Squeeze out the juice from one of the halves of specimen V. Using the reagents provided carry out tests to identify the type of food substances present in the juice (3mks)
         

         Food substance	Procedure	Observation	Conclusion

2. Study the diagrams Q and R carefully and answer the following questions.
   
   
   
   
   1.  
      1. Name the phylum to which specimens R and Q belong. (1mk)
      2. State two reasons for your answer in a (i) above. (2mks)
   2.  
      1. Name the class to which each of R and Q belong (2mks)
      2. State reasons for your answer in (b) (i) above (2mks)
         
         
3. 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)
   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)
      2. Give a reason for your answer in (d) (i) above (2mks)