K.C.S.E Biology Q & A - MODEL 1995PP1QN13

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The chart below shows a feeding relationship in a certain ecosystem

• (a) Construct two food  chains ending with a tertiary consumer in each case (2 mks)
• (b) Which organism has the largest variety of predators in the food web? (1 mks)
• (c) Name secondary consumers  in food web  (2 mks)
• (d) Suggest three ways in which the ecosystem would be affected in there was a prolonged drought.

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KNEC ANSWERS

• (a)
  
  • Green plants – Grasshoppers – Lizards – snakes
  • Green plants – Grasshoppers – Lizards – Cats
    
  • Green plants – Mice – Snakes – Hawkers
    
  • Green plants – Mice – Snakes – cats
    
• (b)
  
  • Mice
    
• (c)
  
  • Lizards eat Hawk snakes, Rej.  If any primary, tertiary consumer is given
    
• (d)
  
  • (i)    Most plants will die  / dry
    
  • (ii)  (same) organisms may starve  to death
    
  • (iii) (same)  organisms may migrate

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