Section B

Instructions : Write your answers in the space provided.

1. The diagram below shows an investigation carried out by Aimi Nadia . She fills 2 teaspoons of dried yeast, 1 teaspoon of sugar and 100 ml of water into a test tube. A balloon is attached to the mouth of the test tube.

The table below shows the results of the investigation.

Time/ minutes 1 2 3 4 5Circumference of the balloon/cm

6 8 10 12 14

Table 1

a) What is the aim of this investigation? …………………………………………………………………………………………….……. …………………………………………………………………………………………………..

b) State one observation based on the result in the table above. …………………………………………………………………………………………..............

c) Give an inference based on your answer in 1(a) …………………………………………………………………………………………………. ………………………………………………………………………………………………….

d) What is the function of sugar in the test tube? …………………………………………………………………………………………..

e) What happens to the circumference of the balloon when the time of the investigation increases?

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

2. The table below shows the result of a fair test done by a pupil to observe the effect of yeast on dough of bread after 4 hours.

Amount of yeast (gram)

Size of dough (cubic centimetre)

5 5010 6015 7020 80

a. What do you want to find out from this fair test?………………………………………………………………………………………………………………………………………………………………………………………..

b. In this fair test,

i) What do you keep the same?………………………………………………………………………………...

ii) What do you change?…………………………………………………………………………………

iii) What do you measure (observe)?…………………………………………………………………………………

c. What can you conclude from this investigation?…………………………………………………………………………………………….……………………………………………………………………………………………

3. The bar chart below shows the number of eggs produced by four types of animals P,Q,R and S.

a) State one observation on the number of eggs produced. …………………………………………………………………………………..................

……………………………………………………………………………………………..

b) How do animals Q and S ensure the survival of their species? …………………………………………………………………………………………….. …………………………………………………………………………………………….

( 1 mark)

c) Predict animal PP: .................................................................................................

( 1 mark) d) Explain how the following animals take care of their young.

i) Female tilapia : ................................................................................................... ....................................................................................................

ii) Kangaroo : ................................................................................................. ................................................................................................

( 2 marks)

4. The table below shows the number of pupils of Sekolah Kebangsaan Pokok Sena having disease X from day 1 until day 5.

Day Number of pupils having disease X12345

610141822

a. What is the pattern of the number of pupils having disease X from day 1 until day 5?

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

b. Give your inference from your observation in question ( a ).

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

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

c. State, i) what to change:

…………………………………………………………………………………………………

[ 1 mark ]

ii) what to observe:

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

[ 1 mark ]

d. Predict the number of pupils who have disease X on day 6.

……………………………………………………………………………………………………

[ 1 mark ]