K.C.S.E Biology Q & A - MODEL 1995PP1QN12

---

The diagram below  shows an experimental  soil up to investigate an  aspect of germination.

• (a) Why are sodium hydroxide pellets used in this experiment?  (1 mk)
• (b) Why is moist cotton wool used in this experiment? (1 mk)
• (c) 
  • (i) By means of an arrow, indicate on the diagram the direction  in which red dye would move during the experiment. (1 mk)
  • (ii) Give reasons for your answer in (c) (i) above (3 mks)

---

KNEC ANSWERS

• (a) To absorb CO; reacts with CO2­
• (b) To provide moisture to generating seeds. Accept water for moisture
  
• (c)       
  
  • (i)
    
  • (ii) Oxygen in the tube  is taken up for germination  CO absorbed by higher pressure outside  tube

---