ULANGKAJI SAINS FORM 4

The figure above shows the apparatus used to study a scientific investigation. Candle P and

candle Q are lighted. A big beaker and a small beaker are inverted on candle P and candle Q

respectively at the same time.

(a) What is the aim of the experiment?

[1 mark]

(b) State the constant variable.

[1 mark]

(c) Predict the observation for the experiment.

[1 mark]

(d) State the conclusion for the experiment.

[1 mark]

(e) State a precautionary step in order to get the correct result.

[1 mark]

The flow chart shows the steps in a scientific investigation.

(a) Complete the table above.

(i) P:

[1 mark]

(ii) Q:

[1 mark]

(iii) R:

[1 mark]

(b) State the meaning of variables.

[1 mark]

(c) State two steps that are done in S.

[2 marks]

The figure below shows a student sitting cross-legged on a chair. A friend hits him lightly

below the knee cap of the dangling leg with a metre rule.

(a) What is the aim of this experiment?

[1 mark]

(b) What can be observed from the experiment?

[1 mark]

(c) Draw arrows and label the neurones involved in the figure below to show how this action

happens.

[3 marks]

The figure below shows the human nervous system.

(a) Identify X and Y.

X : __________________________

Y : __________________________

[2 marks]

(b) State the function of spinal cord.

[1 mark]

(c) What are the basic unit of brain and spinal cord?

[1 mark]

(d) In what form is the information transmitted from sensory organs to the central nervous

system.

[1 mark]

(e) How can the central nervous system controls and coordinate the whole body activities?

[1 mark]

The figure below shows the structure of a neurone.

(a) Identify A and B.

A : __________________________

B : __________________________

[2 marks]

(b) Name the type of neurone shown in the figure above.

[1 mark]

(c) Show on the figure above the direction of the impulse transmitted in the neurone.

[1 mark]

(d) What is the function of the neurone above?

[1 mark]

(e) State the function of the structure labelled C.

[1 mark]

The figure above shows a cell division of a plant cell.

(a) Name the above cell division process.

[1 mark]

(b) Describe what happens in stage C.

[1 mark]

(c) Name a part of the plant that undergoes the above type of cell division.

[1 mark]

(d) How many chromosomes are formed in the daughter cell?

[1 mark]

(e) State two importance of mitosis.

1.

2.

[2 marks]

The figure above shows the changes ijn the state of matter.

(a) Name the process P, Q, R, S and T

[2 marks]

(b) Identify the process that absorbs heat energy.

[2 marks]

(c) Name two substances that undergo process R.

[2 marks]

(d) What is the temperature at which processes (i) Q (ii) S take place if the substance is

water?

[2 marks]

Answer Science Paper 2 (Form 4 – 2nd

Mid Term Exam)

Question 1

(a) To study the effect of the size of a container on the length of time a candle burns.

(b) Type of candles / size of candles

(c) The candle Q inside the small beaker extinguishes first.

(d) The bigger the size of the container, the longer a candle burns inside it.

(e) Seal the side of the beakers with plasticine.

Question 2

(a) P: Identifying the variables

Q: Making hypothesis

R: Controlling the variables

(b) Variables are factors that we can change/manipulate or fix when carrying out a scientific

investigation.

(c) Collecting data / analyzing data / interpreting data / making a conclusion

Question 3

(a) To study the reflex action through knee-jerk reaction.

(b) The dangling leg kicks out.

(c)

Question 4

(a) X: central nervous system Y: peripheral nervous

(b) Control reflex action

(c) Neurones

(d) In the form of electrical impulses / nerves impulses

(e) Nerves impulses from all parts of body are sent through the peripheral nervous system to the

central nervous system.

Question 5

(a) A: Axon B: Dendron

(b) Sensory neurone

(c) From left to right

(d) Receive and transmit impulses from the external and internal environment to the brain and

the spinal cord.

(e) Enables impulses to jump from one node to another. / Enables impulses to be transmitted

faster. / Protecting axons and dendrons from physical injury. / A source of food for axon and

dendron

Question 6

(a) Mitosis

(b) Chromatids of each chromosome now separate and become individual chromosome which

starts to move towards opposite poles of the cell.

(c) Tips of the shoots // tips of the roots

(d) Four

(e) 1. Produces new cells for growth and replaces damaged cells

2. Ensures the number of chromosome in the daughter cell is the same as the parent cell

Question 7

(a) P: Freezing

Q: Melting

R: Sublimation

S: Boiling

T: Condensation

(b) Q, R and S

(c) Dry ice and iodine.

(d) i: 0oC ii: 100

oC