Topical Test 7 biology

7/30/2019 Topical Test 7 biology

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TOPICAL TEST 7

NAME : _______________ FORM 4___

1. Diagram 1 shows a longitudinal section of a part of the wall of human small intestine.

Diagram 1

(a) Name the parts labelled

W :..

X : .

Y : .

Z : .

[4 marks]

(b) The structure Z is involved in the absorption of digested food. State two

adaptations of Z that can help it to function efficiently.

1

2. ........ [2 marks]

(c) Explain what will happen to the glucose in the body after it is absorbed by Y.

..

..

..

[3 marks]

(d) What are the differences in the composition of fluid in W and Y?

....

... [3 marks]

Z

Y

X

W


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2. Diagram 2.1 shows a drawing of a cross-section of a leaf.

Diagram 2.1

(a)(i) Name the structure labelled Q.

[1 mark]

(ii) State twomain types of tissues that form the structure named in (a)(i).

[1 mark]

(b) Explain how the tissue labelled P in Diagram 2.1 is adapted for optimal

photosynthesis.

[2 marks]

(c) Explain how water moves from Q to R during a sunny day.

[3 marks]

(d) Diagram 3.2 shows drawings of an opened and a closed stoma.

Diagram 2.2

Q

P

R


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(i). Name the structure labelled Z.

[1 mark]

(ii). Explain how Z is adapted to control the size of Y.

...

[4 marks]

3. Diagram 4 shows the human digestive system.

Diagram 3

(a) (i) In Diagram 3, name the structures labeled W, X, Y and Z.

(ii) Name the process which moves the food from the mouth to the stomach via

esophagus. .......

[1 mark]

(b) Write the words equation for the chemical digestion which takes place in the

following organs;

(i) Organ X : ........

W :

Y :Z : .

X : .


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(ii) Organ Y :

[2 marks]

(c) (i) Organ Z is specialized for absorption of nutrients. Besides the presence of villi

explain one adaptive characteristic for absorption in this organ.

.

.

.

[2 marks]

(ii) Villus is a finger-like projection lining the lumen of organ Z. Draw a labelled diagram

to show the internal structure of a villus.

[2 marks]

(d) Humans are not able to hydrolyses cellulose due to the lacking ofcellulase in their

digestive system. However, this inability gives benefit to digestive system.

Explain why.

..........................................................................................................

.............................................................................................................................................................................................................................

.............................................................................................................................................................................................................................

...........................................................................................................................................

[3 marks]

4. Diagram 4 shows 4 groups of food necessary for balanced diet.

P Q


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Diagram 4

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

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

[2 marks](b) State the effect of the following malnutrition on a child.

(i) Lack of food from group Q.

(ii) Excess food from group S.

.

[2 marks]

(c) Table 1 shows the example of foods from group P and S and the amount of energy contained in every 100 grams of the food.

Example of food (100 g) Energy content (kJ)

ButterRiceMilkEgg

Bread

35001200200512

1500

Table 1(i) If a student takes in 120g of milk, 80g rice and 50g eggs for breakfast, calculate the amount of energy obtained from the

food.

[2 marks]

R

S

Topical Test 7 biology

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