Biology Paper 3 Questions and Answers - Sunrise 2 Evaluation Mock Exams 2022

Share via Whatsapp
Instructions to candidates
  • Answer ALL questions in the spaces provided.
  • Candidates will be penalized for incorrect spelling especially of technical terms and for use of slovenly language
  • You are required to spend the first 15 minutes of the 1¾hours allowed for this paper reading the whole paper carefully before commencing your work.
  1. You are provided with solution labeled K
    1. Using the reagents provided test for the food substances found in solution K. Record the food you  have tested for, procedure observation and conclusion in the table below (10mks)
       Food substance  Procedure   Observation      Conclusion
             
             
             
             
    2.  
      1. Name an enzyme that may be required to digest the food substance found in solution K in a human being. (1mk)
      2. State the name of the part of alimentary canal in which the enzyme named in (b)(i) above is found (1mk)
  2.  
    1. Study photograph A below which shows a plant specimen and an associated sisal pole study and answer the questions that follow
      BioPP32022SRQ2
      1. What name is given to the coiled part of the plant specimen shown in photographA?    (1 mark)
      2. Name the type of response exhibited by the coiled part of the plant specimen in photograph A (1 mark)
      3. Specify the stimulus responsible for the response named in (a)(ii) above (1 mark)
      4. Explain how the response exhibited by the coiled part of the plant specimen in photograph A occurred (3 marks)
      5. State the biological significance of the response described in (iv) above to the survival of the plant (1 mark)
    2. Study photographs B1 and B2 below carefully and answer the questions that follow. The part in B2 was extracted from the specimen in B1
      BioPP32022SRQ2b
      1. Identify the agent of pollination of the specimen shown in the photographs above    (1mark)
      2. Give a reason for your answer in (b)(i) above (1mark)
      3. Describe the pistil of specimen B1 (2 marks)
      4. What is the name given to the type of pistil found in specimen B1? (1 mark)
      5. Describe the external features of the leaves of the plant from which specimen B1 was obtained (3marks)\
  3. The diagram below shows structures which occur in a mammalian kidney. Study the figure  carefully and answer the questions that follow.
                BioPP32022SRQ3
    1.  
      1. Name the parts marked ( 2 marks)
        A.......................
        D......................
      2. Identify the blood vessels labeled:                                  ( 4 marks)
        B.............................
        C ...........................
        G.............................
        H.........................
    2.  
      1. Name the filtrate labeled F                                                      ( 1 mark)
      2. Explain how the filtrate named in (b) (i) above is formed    ( 3 marks)
    3. Explain the difference  in structure E in a desert and a fresh water animal.   (2 marks)
    4. Name the hormone which regulates reabsorption of sodium ions in the kidney tubules.          (1 mark)


CONFIDENTIAL

Each student will require the following:

  1. 10ml of 10% sucrose solution labeled K
  2. Access to iodine solution
  3. 2 mls of Benedict solution
  4. Access to dilute HCL
  5. Sodium Hydrogen Carbonate solution
  6. 2ml 10% Sodium Hydroxide
  7. 2ml 1% freshly prepared Copper Sulphate
  8. Source of heat


MARKING SCHEME

  1.  

    1.  Food substance  Procedure   Observation      Conclusion
       Starch  Put 1 ml of K add 2 drops of iodine  No observable change  Starch absent
       Reducing sugar  To 1ml K add equal amount of Benedict solution and boil  No observable colour /change  of Benedict retained  Reducing sugar absent
       Non-reducing sugar - To 1ml of K add 2 drops of diluted HCL and boil;
      - Cool and add NaHCO3 until fizzing stops;
      - Add equal volumes of Benedict solution and boil
       Colour changes from blue to green to yellow /brown / orange  Non – reducing sugars present
       Protein  To 1ml of K add 1ml of NaOH followed by 2 drops of copper  sulphate then shake   Colour changes to purple/ violet Protein present 
    2.  
      1. Sucrase          (1mk)                                                                                                                                               
      2.  Ileum; accept small intestine                                                                                                                       
    3. Accept any correct adaptation (2mks)
  2.  
    1.  
      1. tendrils
      2. Thigmotropism;
      3. Touch
      4. Contact causes lateral migration of auxins to the outer side of the stem. Since higher auxin concentration promotes faster growth in shoots, the greater auxin concentration in the outer part causes faster growth  than the part in contact with the object hence the shoot continues to coil round the object.
      5. Helps the plant to obtain support.
    2.  
      1. Insect pollinated;
      2. it is brightly coloured and conspicuous petals
      3.  
        • Ovary superior/hypogynous - Long white style
        • Style braches near the tip - Red round stigma
      4. Polycarpous
      5.  
        • Network of veins/reticulate
        • Serrated margin
        • Pointed apex
  3.  
    1.  
      1.  
        • A- Medulla;
        • D- Cortex;
      2.  
        • B- Renal artery;
        • C- Renal vein;
        • G- Afferent arteriole;
        • H- Efferent arteriole;
    2.  
      1. Glomerular filtrate;
      2. Formed by ultrafiltration; due to wider afferent arteriole and narrower efferent arteriole resulting in high pressure due to resistance  in glomerular capillaries; the pressure  causes filtration of substances having small molecules into the capsular space;
    3. E is longer in a desert animal  to conserve water; and shorter in fresh water animal to facilitate elimination of excess water from the body;
    4. Aldosterone;
Join our whatsapp group for latest updates

Download Biology Paper 3 Questions and Answers - Sunrise 2 Evaluation Mock Exams 2022.


Tap Here to Download for 50/-




Why download?

  • ✔ To read offline at any time.
  • ✔ To Print at your convenience
  • ✔ Share Easily with Friends / Students


Get on WhatsApp Download as PDF
.
Subscribe now

access all the content at an affordable rate
or
Buy any individual paper or notes as a pdf via MPESA
and get it sent to you via WhatsApp

 

What does our community say about us?