Section A

(40 Marks)

Answer All Questions

1.

Figure 1

Figure 1 shows the human respiratory system.

(a) Name the structures X, Y and Z.

(i) X : ______________________________________________________

(ii) Y : ______________________________________________________

(iii) Z : ______________________________________________________

(3 marks)

(b) Name the gas that diffuses through the alveolus into the capillaries.

_____________________________________________________________

(1 mark)

(c) Complete the flow chart below to show the sequence of air movement from the nose to the alveolus.

(3 marks)

2.

Figure 2

Figure 2 shows the human urinary system.

(a) Name the structure X and Y.

(i) X : _______________________________________________________

(ii) Y : _______________________________________________________

(2 marks)

(b) In the diagram, mark the ureter with the letter P and urethra with the letter Q.

(2 marks)

(c) What is the function of structure X?

______________________________________________________________

______________________________________________________________

(1 mark)

(d) What will happen to the human body if structure X cannot function?

______________________________________________________________

______________________________________________________________

(1 mark)

(e) What is the function of structure Y?

______________________________________________________________

______________________________________________________________

(1 mark)

(f) Apart from structure X, name another human organ which plays a similar role.

______________________________________________________________

(1 mark)

3.

Figure 3

Figure 3 shows a type of human blood cell.

(a) What is the type (name) of human blood cell shown above?

(1 mark)

(b) What is the function of this blood cell?

___________________________________________________________________

(1 mark)

(c) Where is this cell produced?

___________________________________________________________________

(1 mark)

(d) Draw the structure of a red blood cell in the space below and compare it with the blood cell above.

(2 marks)

Difference : ____________________________________________________

____________________________________________________

(1 marks)

(e) What is the function of the red blood cell?

___________________________________________________________________

(1 mark)

4.

Figure 4

Figure 4 shows the structure of a human male gamete.

(a) Name the male gamete.

______________________________________________________________

(1 mark)

(b) Name the parts X, Y and Z.

(i) X : __________ (ii) Y : ________ (iii) Z:__________

(3 marks)

(c) What is the function of structure Z?

______________________________________________________________

(1 mark)

(d) State the function of the male gamete in reproduction.

______________________________________________________________

(1 mark)

5. (a) State two advantages of vegetative reproduction over sexual reproduction.

i. ______________________________________________________

ii. ______________________________________________________

(2 marks)

(b) State two disadvantages of vegetative reproduction.

iii. ______________________________________________________

iv. ______________________________________________________

(2 marks)

6.

Figure 5

The graph in Figure 5 shows the pattern of body weight increases for boys and girls.

(a) Label the curved lines

(i) ________________________________________________________

(ii) ________________________________________________________

(2 marks)

(b) State the age group at which human growth is the fastest.

____________________________________________________________

(1 mark)

(c) At which age group will the body weight increase

(i) of boys and girls be about the same?

_______________________________________________________

(ii) of boys is faster than that of girls?

_______________________________________________________

(iii) of girls is faster than that of boys?

_______________________________________________________

(3 marks)

(d) Children at the adolescent stage need a lot of carbohydrate in their diet. Explain.

____________________________________________________________

____________________________________________________________

(2 mark)

SECTION B

(20 Marks)

Answer all questions

Figure 1

1. Two sets of apparatus have been set up to study transpiration in plants.

(a) What is the hypothesis of the experiment?

_______________________________________________________

_______________________________________________________

(1 mark)

(b) State the control variables:

(i) Constant : ________________________________________

(ii) Manipulated : _____________________________________

(iii) Responsive: _______________________________________

(3 marks)

(c) What can be observed after three hours?

___________________________________________________________

___________________________________________________________

(1 mark)

(d) Give four factors affecting the rate of transpiration:

(i) ______________________________________________________

(ii) ______________________________________________________

(iii) ______________________________________________________

(iv) ______________________________________________________

(4 marks)

(e) What structure allows transpiration to take place on a leaf?

___________________________________________________________

(1 mark)

Figure 2

2. The apparatus in Figure 2 is set up to study the conditions for the germination of seeds. The apparatus with the materials are left for 3 days.

(a) What hypothesis can be made from this experiment?

______________________________________________________________

(1 mark)

(b) What variable that

(i) is kept constant? : _______________________________________

(ii) is manipulated? : _______________________________________

(iii) responds? : _______________________________________

(3 marks)

(c) Why is cool boiled water used?

______________________________________________________________

(1 mark)

(d) What is the role of the oil in test tube B?

______________________________________________________________

(1 mark)

(e) State two different conditions necessary for the germination of seeds.

(i)____________________________________________________________

(ii)___________________________________________________________

(2 marks)

(f) Draw the germination process of seeds.

(2 marks)