Biology Paper 3 Questions - Mangu High School Mock Exams 2022

QUESTIONS

1. You are provided with Specimen K. Carefully cut a transverse section through specimen K using a scalpel provided.
   1.              
      1. By observing one of the two halves of specimen K, Give two reasons to prove that specimen K has axile placentation (2mks)
      2. Squeeze some juice from specimen K into 100ml beaker provided and label it as juice K. using a portion of juice K, carry out the food test using the reagents provided and complete the table below. (NB preserve the remaining portion of juice K for use in question 2.)  (6mks) 
         

         Food substance	Procedure	Observation	Conclusion

      3. Name the deficiency disease that results from lack of the food substance present in juice K. (1mk)
      4. Highlight two symptoms of the disease named in (a) (iii) above (2mks)
2. Put 2cm³ of liquid labelled C into a test tube. Draw some of the juice from specimen K into a dropper. Add 4 drops of the juice into the test tube with solution C and shake.
   1.              
      1. State your observation.
      2. State the part of the human body where the process demonstrated above occurs and the enzyme that carries out the process.
         Part of body .....................................................................
         Enzyme ...........................................................................
      3. Which gland produces the enzyme stated in (a)(ii) above?
   2. Take a small amount of substance B provided and add to it 2cm3 of sodium hydrogen carbonate solution.
      1. State your observations
      2. Which process in the body is illustrated above?
      3. State the part of the body where the above process takes place
      4. State two functions of substance B in the body
      5. Name two diseases of the circulatory system caused by excess cholesterol in food. (2mks)
3.                    
   1. photograph J shows the circulatory system of organism represented by photograph G.
      
      
      1. Giving one reason to your answer name the class to which specimen G belongs.
         Class.
         Reason
      2. Name the part labelled: (3mks)
         M ........................
         N ........................
         O ........................
      3. Giving one reason to your answer state the type of closed circulatory system shown by photograph J
         Type of circulatory system ................................................
         Reason ................................................
      4. State two features of specimen G that enhances its streamlined shape
   2. The diagrams below show different types of fruits. Use them to answer the question that follow.
      
      
      1. Draw a well labeled diagram of one on the fruits in photograph R1 in the diagram above
   3. State the mode of dispersal and give reasons for the fruits shown in photograph R1, R2 and R3 (6 Marks)
      Reason ........................
      R1 ........................
      Reason ........................
      R2 ........................
      Reason ........................
      R3 ........................