Section B(30 marks)

Answer all questions

1. Diagram 1.1 shows the nervous pathway when the hand of a child accidentally touches a hot kettle

a) Name the structures P and Q in the boxes provided in Diagram 1.1 ( 2 marks) b) On Diagram 1.1, indicate with arrows ( ) to show the flow of the nerve impulse ( 1 mark) c) What happens to the muscle when the child touches the kettle ? …………………………………………………………………… (1mark) d) (i) What kind of action is shown in Diagram 3.1 ……………………………………………………….. (1mark) (ii) Diagram 1.2 shows the human nervous system

On Diagram 1.2 Label the part which controls the action shown in Diagram 1.1 with letter ‘X’ (1 mark)

Diagram 1.1

Diagram 1.2

2. Diagram 2 shows an incomplete schematic diagram for the human reproductive

a) Complete the schematic diagram in Diagram 2 (2 marks)b) Name the process I and II (i) Process I : ………………………………………….. (1mark) (ii) Process II : ………………………………………….. (1mark) c) The zygote T produced will undergo mitosis and split into two (i) What type of twins will be produced? ………………………………………………………………………… (1mark) (ii) State one characteristics of the type of twins in (c) (i) ………………………………………………………………………… (1mark)

44 + XY 44+XX

22+X 22+X 22+X

44+XX 44+XY 44+XY

Process I ……………………………………………………………………….

Gamete

………………………………………..……………………………………..…………………………………………………………………………

Process II

Zygote

R S T U

Diagram 2

Father Mother

3. The diagram 3 shows two models of atomic structure.

a. i. Name X…………………………………………………………………… (1 mark)ii. Write one similarity and one difference between Atom M and Atom N

Similarity ……………………………………………..…………. Difference. …………………………………………………………

(2 marks)b. Why are atom M and N isotopes?

……………………………………………………………………………… (1 mark)

c. Name one example of an element which contains isotopes.

……………………………………………………………………………… (1 mark)

d. Write one use of isotope in medical field.

………………………………………………………………………………

Diagram 3

4. Diagram 4 shows a hydraulic system

Diagram 4

6.5. Diagram 5 shows the block diagram of a receiver system

Diagram 5

Answer Scheme modul 1

1. a. P : Relay neurone Q : Motor neurone c. The muscle will contract immediately d. (i) Reflex action (ii)2. a. 22 + Y 44 + XX b. i) Process I : Meiosis ii) Process II : Fertilisation c. (i) Identical twins (ii) same sex/ genetic traits/ appearance

3. a. i) X : protons ii) Similarity : Same proton number Difference : Different nucleon number/ neutron number b. M and N are isotope because they have same proton number and different nucleon number c. H-1,H-2 and H-3/C12, C14/Cl35,Cl37 d. Treat cance/ strelise/ medical devices

4. a. 20Ncm-1

b. i) Force = 4000N x 0.5m2 = 200N 10m2

ii) 100N c. Pascal’s principle/ The principle of transmission of pressure in liquids d. Hydraulic jack / hydraulic brake5. a. Modulated radio waves b. i P: Tuner ii Q : Demodulated

c. To amplified the sound waved. Loudspeakere. Q/detector