science form 4 exam question

MID YEAR EXAMINATION SMK

SCIENCE FORM 4Objective Questions

1. What is the basic unit in the nervous system?A AxonB NucleusC NeuroneD Dendrite

2. What is the function of the myelin sheath ?A Transmits impulses to the cell bodyB Transmits impulses from the cell bodyC Speeds up the transmission of impulsesD Controls all the activities in the neurone

3. Sensory cells which can detect stimuli are calledA NeuroneaB EffectorsC ReceptorsD Cell bodies

4. Involuntary actions are controlled by theA CerebrumB CerebellumC Spinal CordD Medulla Oblongata

5. Which of the following statements is not true about hormones?

A Hormones are secreted by endocrine glandsB Hormones are carried by blood to all parts of the body.C Hormones function by controlling and regulating body activities.D Each hormone has only one target organ.

6. What is the function of thyroxine ?A Controls the menstrual cycleB Stimulates the development of Male secondary sexual characteristicsC Controls the rate of metabolism in the

bodyD Prepares the body for actions during

an emergency

1

7. The figure shows the male endocrine system. Which of the following glands A, B, C and D is the pituitary gland?

8. Undersecretion of insulin will cause

A GoitreB DwarfismC GigantismD Diabetes mellitus

9. The following are effects of drug abuse except

A Causing hulluinations.

B Activating the nervous system.

C Slowing down nerve impulses.

D Increasing sensitivity to stimuli.

10.Proprioceptors are receptors which are sensitive to

A LightB SoundC SmellsD Movements

Name : ………………………….. Form : ………………..

11. Excessive consumption of alcohol will cause

I brain damageII better judgementIII cirrhosis of the liver

A I and II onlyB I and III onlyC II and III onlyD I, II and III

12. The factors which can affect the state of mind are

I drug abuseII hormonal imbalanceIII excessive consumption of

Alcohol


13. The diagram shows the different phases in cell division in mitosis.

Which is the correct sequence in the mitosis?A P,Q,R,SB Q,R,P,SC R,S,Q,PD S,P,R,Q

14. A mouse’s somatic cell contains 40chormosomes. How many chromosomes are found in its ovum?

A 20B 40C 60D 80

2

15. The diagram shows a first generation of cross breeding of two cats.

H represents the dominant genes for black furh represents recessive genes for white fur

What are the genes for the parents?Male Female

A HH HhB HH hhC Hh hhD hh Hh

16. The diagram shows how the sex offspring is determined in humans.

Which chromosomes are found in gametes P and Q?

P QA 22 + X 22 + YB 22 + Y 22 + XC 44 + X 44 + YD 44 + Y 44 + X

17. Which of the following processes involve mitosis?

I Formation of gametesII Development of embryosIII Asexual reproduction


18. The figure shows the inheritance of height of pea plants.

Which offspring has a correct pair of genes?Offspring Pair of genes

A P Tt B Q TTC R TTD S tt

19. The chromosomes present in the male skin cells are

A 22 + YB 22 + XC 44 + XXD 44 + XY

20. Ali and Ahmad are identical twins. Ali is brought up in Malaysia. Ahmad is brought up in England by his foster parents. They may be different inA weightB blood groupC type earlobeD the ability to roll the tongue

3

21. Meiosis is important forI replacing worn-out cellsII producing reproductive

cellsIII causing variation among

Individuals


22. The sex of a baby is determined byI the sex chromosome of

the spermII the sex chromosome of

the ovumIII the number of sex

chromosome

A I onlyB II onlyC I and III onlyD I, II and III

23. Which of the following statements are true about identical twins?

I They result from the fertilization of an ovum by a sperm.

II They must be of the same sex.

III They carry the same genetic information


24. A female who has only one X chromosome is said to suffer from

A Down’s syndromeB Turner’s syndromeC Klinefelter’s syndromeD Albinism

25. Colour-blindness is a genetic disorder caused by

A a chromosome mutationB the presence of 3 sex

chromosomesC the presence of an extra

chromosome 21.D a recessive gene in the X

Chromosome

26. Which of the following genetic disorders are caused by chromosome mutations?

I Down’s syndromeII Turner’s syndromeIII Klinefelter’s syndrome


27. Selective breeding is carried out on crops to produce plants which

I are more resistant to diseasesII bear more fruitsIII produce fruits of better qualities


28. Which of the following characteristics is affected by environmetal factors?

A Body weightB Blood groupC The ability to roll the tongueD Type of ear lobes

29. Which of the following is an example of a discontinuous variation?

A HeightB Skin colourC Body weightD Blood group

4

30. The figure shows the breeding of two different type of papaya.

The breeding of these papayas is to produce

A plenty of papaya RB sweeter papaya RC a papaya R tree that

bears fruit earlierD a papaya R tree that is

resistant to disease

31. The diagram shows the structure of a human brain. Which of the parts A, B, C and D control the body equilibrium?

32. Which of the following the correct sequences of the mitosis stages?

33. The diagram shows the inheritance of height in a type of plant.

What is the ratio of the number of tall young plantsTo the number of dwarf young plants in the filialgeneration?

A 1 : 0B 1 : 1C 1 : 3D 3 : 1

34.Which of the following is an example of a continuous variation?

A HeightB Blood groupC Type of ear lobeD Ability to roll the tongue

35. Which of the following statements is correct about meiosis?

A Involves all types of cellsB Involved in growthC Halves the number of chromosomesD Genetic contents of daughter cells and

Parent cells are similar

36. Which of the following shows the correct number of autosomes and the correct type of sex chromosomes in a baby girl?

A 22 + XB 22 + YC 44 + XXD 44 + XY

5

37. The figure shows a process that occurs during cell division.

The process refers toA mitosisB mutationC cross-overD fertilization

38. The figure shows the chromosomes found in the cells of a human body suffering from a genetic disease.

Which chromosome pair causes the diseases?A 1B 6C 21D 23

39. The graph shows an example of variation among the students in a class.

Another example of the same type of variation is

A type of hairB body weightC blood groupD type of ear lobes

40. Harris picks some tomatoes. What type of actionis this?A A reflex actionB A capillary actionC A voluntary actionD An involuntary action

41. Based on the table, which elements are isotopes?

A E and GB G and JC J and LD E and L

42. When water changes into ice,A heat is absorbed from the surroundingB its molecules lose their kinetic energyC its molecules are not in an orderly arrangementD the forces of attraction between molecules

decreases

6

43. Based on the periodic table, which element represent a metal?

44. Which of the following is not stated in the kinetic theory of matter?

A Matter is made up of tiny particles.

B The particles of matter are in constant motion.

C When atoms combine chemically, molecules are formed.

D When temperature rises, the particles of matter obtain more kinetic energy and move faster.

45. Which of the following statements about the characteristics of subatomic particles is not true?

A Neutron is neutral in terms of charges.

B Proton is the nucleus of an atom.

C The mass of the neutron is so small that it is negligible.

D Electrons surrounds the nucleus in paths called orbits.

46. Which of the following statements is not true about solid particles?A The particles are closely packed.B The kinetic energy of the

particles are high.C The particles cannot move

freely.D The particles can only vibrate.

47.

48.

49.

7

50.

science form 4 exam question

Documents