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CHAPTER 6 : NUTRITION

1. The figure below shows 4 groups of food necessary for a balanced diet.

(a) (i) State the food class represented by group P

…………………………………………………………………………………..(ii) State the main function of food from group P

…………………………………………………………………………………..(b) (i) State why a pregnant mother needs food from group T

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P R 

S T

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(c ) State the effect of the following on a child:

(i) lack of food from group R

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(ii) excess food from group S

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(d) The table below shows the type of foods from groups P and S and the amountof energy contained in every 100 grams of food

If a student takes in 150 g of milk, 100 g of bread and 80 g of eggs for breakfast, calculate the amount of energy obtained from the food

Type of food ( 100 gm) Energy (KJ)

MilkEgg

BreadRice

Butter 

274612

102515313006

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2. Diagram 2 shows human digestive system.

DIAGRAM 2

(a) (i) Name organ Q.

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(ii) Explain the process of food digestion in Q.

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(b) State two effects if the gastric glands in Q are unable to produce hydrochloric

acid.

Q

P

R

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1 : ..………………………………………………………………………………

2: ……………...…………………………………………………………………

3. Figure 3 shows a part of the ileum structure.

FIGURE 3

(a ) (i) Name the structure shown in Figure 3.

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(ii) State the function of the structure in a(i).

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W:

X:

Y:

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(b) Label W, X and Y in Figure 2

(c) State two structural features of the structure in Figure 2 which enable it tocarry out its function efficiently.

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(d) Explain how proteins and lipids are absorbed in the structure shown in figure 1.

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(e) A teenager used to take an excessive amount of protein in his daily diet.Explain how a liver functions in the regulation of the excess protein.

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3. Diagram 3 shows a digestive system of a rodent.

 

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(a) (i) Label Q in the box provided. 

(ii) Explain one adaptive characteristic of Q in carrying out digestion andabsorption.

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(iii) Explain why structure S in a rodent is bigger than the one in a human

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(b) Explain the digestion of cellulose found in a carrot eaten by a rabbit.

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(c ) In human, there is no digestion of cellulose. Explain the statement.

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4. Diagram 4 shows the assimilation of digested food in the organ and bodycell.

DIAGRAM 4 

a ) Based on Diagram 4 , explain the assimilation of the following typesof food

( i ) glucose( ii ) amino acids( iii ) lipids

5. The energy requirement for a girl aged 15 is 7500 kJ daily.The table below shows types of food, quantity and energy content of her dailymenu.

 

Types of food Quantity taken( g )

Energy Content( kJ /100 g )

Rice 350 1500Chips 150 1000

Roasted Chicken 300 800

Grilled Beef 200 1200

Boiled potato 150 500

Chocolate 100 2500

Yoghurt 200 200

Egg 100 600

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(a) Calculate the total energy value taken by the girl daily .If she continuesto take the menu everyday for a long time, explain the consequences of the habit to her health.

 

2.