SMJK CHONG HWA KUALA LUMPUR

UJIAN SERENTAK 2015SAINS

TINGKATAN 4

Nama : ________________________________

Tarikh : 4 Mac 2015Tingkatan : 4 ______

Masa : 1 Jam 30 MinitSection A: Answer all of the questions. (20 Marks)

1.What is meant by body coordination?

A. To coordinate bodys growth

B. To coordinate position and balance of the body

C. To coordinate bodys responses towards any stimuli

D. To coordinate secretion of hormone by endocrine gland

2. Which of the following is the component of central nervous system?A. Brain C. Spinal nerve

B. Cranium D. Cranial nerve

3. Diagram 1 represents a neurone.

Diagram 1

What is the function of the neurone shown?

A. It transmits impulse to an effector

B. It receives impulse from an effector

C. It transfers impulse from sensory neurone to a motor neurone

D. It transmits impulse from motor neurone to a sensory neurone

4.Diagram 2 shows the structure of a neurone.

Diagram 2

Which part A, B, C and D is the dendrite?

5.Nervous coordination requires receptors and effectors. What are the functions of the receptor and effector?Receptor

Effector

A.

Send impulses

Detect changes

B.

Detect changes

Send impulses

C.

Detect changes

Respond to changes

D.

Found in the skin

Found in the brain

6.Diagram 3 shows the flow of impulses in a reflex arc for a reflex action.

Diagram 3

What are P, Q and R?

P

Q

R

A.

Relay neurone

Sensory neurone

Motor neurone

B.

Sensory neurone

Motor neurone

Relay neurone

C.

Motor neurone

Relay neurone

Sensory neurone

D.

Sensory neurone

Relay neurone

Motor neurone

7.Diagram 4 shows the impulse pathway in nervous coordination.

Diagram 4

Which of the following represents R?

A. Eyes C. Glands

B. Brain D. Muscle

8. What is the function of stretch receptor?A. To detect pain C. To maintain body posture

B. To detect pressure D. To maintain body temperature

9.Where are proprioceptors found?A. Muscles, tendons and ligament

B. Ears, throat and oesophagus

C. Tongue, teeth and gumD. Eyes, nose and mouth

10.Diagram 5 shows part of the human central nervous system.

Diagram 5Which part A, B, C and D controls the heart beat?

11.Which activity is an involuntary action?

A. Dancing C. Walking

B. Knee jerk D. Thinking

12. Diabetes mellitus is a condition caused by the undersecretion of a certain hormone. Which of the following pairs names the hormone and the relevant endocrine gland correctly?Hormone

Endocrine gland

A.

AdrenalineAdrenal glandB.

Insulin

Pancreas C.

Thyroxine

Thyroid glandD.

Oestrogen Ovary

13.Which of the following pairs of nervous coordination and hormone coordination is correctly matched?Nervous coordination

Hormonal coordination

A.

Long-term effectShort-term effectB.

Slow responseImmediate responseC.

Consist of nervesConsist of ductless glandsD.

Widespread target areaLimited target area

14.Which group of drugs is used to relieve pain?A. Hallucinogen C. Stimulant

B. Depressant D. Opiate

15.Excessive consumption of alcohol can causeI Loss of muscular coordination III Cirrhosis of the liverII Quick response to stimulus IV HallucinationA. I and II C. I and IVB. I and III D. III and IV

16.Diagram 6 shows a process called crossing-over.

Crossing over causes

A. Mutation C. Reproduction

B. Growth D. Variation

17.Which of the following statements is correct about meiosis?A. Involved in growth

B. Involves all types of cells

C. Halves the number of chromosomes

D. Genetic contents of daughter cells and parent cells are similar

18. Which of the following shows a dominant trait?A. Blue eyes C. Attached earlobe

B. Curly hair D. Unable to roll the tongue

19.Diagram 7 shows the inheritance of the colour of the flower.

Parents :

Gametes :

Offspring :Diagram 7What is the phenotypic ratio in the first generation?Purple

White

A.

1

1

B.

1

2

C.

13D.

31

20.Diagram 8 shows a monohybrid cross between two rats having different fur colour.Parents Phenotype :

Parental Genotype :Gametes :

Offspring :

Diagram 8

What is the parental genotype?

MaleFemaleA.

BB

Bb

B.

BbBbC.

Bb

bb

D.

bbbb

Section B: Answer all of the questions. (30 Marks)1. Diagram 9 shows an experiment to study the relationship between the number of loads on a spring and the lengthening of the spring.

Diagram 9This experiment is repeated by using different number of loads. The results of the experiment are recorded in Table 1.

Number of loadLengthening of the spring (cm)

Table 1

(a) Complete Table 1.

(3 marks)

(b) Based on Diagram 9, state the following variables:(i) Manipulated variable:

(1 mark)

__________________________________________________________________________

(ii) Responding variable :

(1 mark)

__________________________________________________________________________

2. A student conducted an experiment to study the growth of a corn seedling. The height of the corn seedling is measured for every two days. The result of the experiment is shown in Table 2Time/dayHeight of corn seedling/cm

00

26

420

630

835

Table 2

(a) Based on Table 3, the height of the seedling increases the most from day_________ to day ________[1 mark](b) Using the data in Table 3, draw a graph of the height of the seedling against time on the graph paper below.

[2 marks](c) What is the relationship between the height of the seedling and time?

____________________________________________________________________________________

[1 mark]

(d) Predict the height of the seedling on the 10th day.

____________________________________________________________________________________[1 mark]3. Diagram 10.1 shows the structure of a neurone.

Diagram 10.1

(a) Based on Diagram 10.1, mark () for the type of neurone in the box provided.

(1 mark)

Sensory neuroneRelay neuroneMotor neurone

(b) Based on Diagram 10.1, identify the following part:

(2 marks)

P : ________________________________________________

Q: ________________________________________________

(c) State the function of P.

(1 mark)

________________________________________________________________________________

(d) Diagram 10.2 shows the pathway of an impulse.

Diagram 10.2

Mark () for the location of this type of neurons in Diagram 10.2

(1 mark)4. Diagram 11 shows the structure of a human brain.

Diagram 11(a) Name the part labeled as X and Y.

(2 marks)

(i) X : _____________________________________

(ii) Y : _____________________________________

(b) What is the advantage of the highly folded surface of X?

(1 mark)

________________________________________________________________________________

(c) What is the function of the part labeled as Y?

(1 mark)

________________________________________________________________________________

(d) What will happen if part Y is injured?

(1 mark)

________________________________________________________________________________

5. Diagram 12 shows the location of the main endocrine glands in the human body.

Diagram 12(a) (i) State the label and name the endocrine gland in Diagram 12 that is known as the master gland of the endocrine system.

(2 marks)

________________________________________________________________________________

(ii) State the reason why is it known as the master gland?

(2 marks)

________________________________________________________________________________

(b) Name a hormone secreted by N.

(1 mark)

________________________________________________________________________________

6. Diagram 13 shows the phases of a cell division.

Diagram 13(a) (i) Name this type of cell division.

(1 mark)

________________________________________________________________________________

(ii)Give one reason for your answer in 5(a)(i).

(1 mark)

______________________________________________________________________________

(b) What process occurs during stage Q?

(1 mark)

________________________________________________________________________________(c) Name two organs of the body where this cell division occurs.

(2 marks)

________________________________________________________________________________

~~ END OF QUESTION PAPER ~~

Disediakan oleh:

Disemak oleh:Disahkan oleh:

(NURUL AINI BINTI MD DESA)

Guru Sains(CHIN HUEY WEN)

Ketua Bidang Sains dan Matematik(LOW SIOW NGO)

Penolong Kanan Tadbiran Dan Kurikulum

Cell body

Axon

Dendrites

B

C

A

D

impulse

Effector

R

Q

P

Receptor

Response

Effector

R

Receptor

impulse

Stimuli

B

A

C

D

Diagram 6

White

yy

Purple

Yy

yy

yy

Yy

Yy

y

y

y

Y

Female

White fur

Male

Black fur

x

bb

bb

Bb

Bb

b

b

b

B

17 cm

14 cm

11 cm

8 cm

R

Q

P

Effector

Receptor

Central nervous system

Y

X

12