Thursday, March 17, 2022




1. State the name given to the study of :

(a) The cell
  • Cytology

(b) micro-organisms

  •  Microbiology
2. The diagram below show a transverse section of a plant organ.
(a) Name the plant organ from which the section was obtained
  • Stem
 (b) (i) Name the class to which the plant was obtained (1mk)
  • Monocotyledonae
      (ii) Give the reason for your answer in b(i) above        (1mk)
  • Vascular bundles are scattered
(c) Name the part labelled X                      (1mk)
  • Epidermis
 3. State the function of:
 (a) Ribosomes                                         (1mk)
  • Protein synthesis
 (b) Lysosomes                                         (1mk)
  • Destroys worn out organelles
4.The diagram below shows a specialized plant cell


(a) (i) Name the cell.
  • Root hair cell
    (ii) Name the parts labeled D and E.
  • D-cell wall 
  • E-cell sap(Vacuole)
   (iii) State the function of the part labelled C
  • Controls cell activities
5. . State three ways in which a respiratory surface is adapted to its function. 
  •  It has a large surface area for efficient diffusion of gases
  • Moist to dissolve gases before diffusion
  • This for efficient diffusion of gases across a short distance
  • Highly vascularized to transport diffused gases efficienty

6. State one function for each of the following: 

(a) Cerebellum   

  • Maintain balance   
(b) Medulla oblongata  
  • controls heart bea

 7. Distinguish between haemolysis and plasmolysis.    

  • Hymolysis :process by which red blood cell take in water until they burst
  • Plasmolysis: loss of water from plant cell until the membrane is detached from the cell wall

8. State three external differences between chilopoda and diplopoda.   

  •  chilopoda has a pair of walking legs per segment while diplopoda has two pair of walking legs per segment
  • chilopoda has dosoventrally flattened body while diplopoda has cylindrical body
  • chilopoda's body is divided into head and trunk while diplopoda's body is divided into head thorax and trunk
  • chilopoda has posterior genital aperture while diplopoda has anterior genital aperture
  • chilopoda has poisonous claws while diplopoda lacks poisonous claws

 9. State two ways in which chloroplasts are adapted to their function.  

  • contains chlorophyll which absorbs light energy
  • It has stroma which contains enzymes for photosynthesis
  • It has a large number of grana which increases surface area for accommodation of a large number of chlorophyll molecules for photosynthesis

 10. State two advantages of hybrid vigour.     

  • resistance to diseases
  • early maturity
  • Increased yields
  • resistance to drought

 11. The diagram below shows a transverse section of a leaf.



Kapsabet High School KCSE Mock CRE Paper 2 Marking Scheme

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