1.  Describe briefly the role of the stomach in digestion.                                [8 marks ]
2.  (i)   Name three parts of plants in which food can be stored

(ii)   Give one example in each case                                                                 [6 marks ]

1.  Explain briefly how the level of sugar in the mammalian blood can be regulated.                                                                                                            [6 marks ]

 

 

observation

     This was a popular question with the candidates and they performed well.
   Most candidates could describe the role of the stomach in digestion and the relevant points were
    given in a sequential order.
The candidates were able to properly state the sites of food storage in plants but performed poorly   in giving examples.  In explaining the process of sugar regulation most candidates instead of describing the process merely stated the role of insulin in sugar regulation and so lost a lot of  marks.
Expected answers include:
            Examples of sites of food storage in plants.
            Leaves- Onions, Shallot, Garlic
            Stems -  Yam, Sugar cane, Ginger, Irish potatoes.
            Root – Cassava, Carrots, Sweet potatoes.
            Seed -  Groundnut, Beans, Coconut, Cashew
            Fruit – Maize, Guava, Orange, Pawpaw, Cashew, Palm nut, Mango.
 
           Sugar regulation in mammals

• The liver controls the blood glucose levels;
• It converts excess glucose in the blood to glycogen;
• The process is stimulated by the hormone insulin; which is secreted by the pancreas;
• When the blood glucose level falls below normal;
• The pancreas secretes another hormone glucagon;
• This  stimulates the conversion  of glycogen into glucose;
• Which is released into the blood.