2007 Ce Bioloyg Paper 2 Marking Schemes

1.

A

Leaf epidermal cell has a layer of waxycuticle to reduce water loss Root hair cell does not have cuticle so asto have better absorption of mineral salts 2.

C

The leaf blade provide large surface areafor the receive of sunlight 3.

C

Photosynthesis is a building-up process 4.

D

Nuclear Fuel will be used up 5.

A

Refer to 2005 CE Biology Paper 1 6.

A

7.

B

Enzyme can be reused. It is substrate(Peroxide) the limiting factor 8.

C

The level should be equal 9.

C

Trachea is supported by C- shape Cartilage 10. D Simple procedure!!!! 11. B Animal cell does not have LARGE centralvacuole 12. B 13. B There is a decrease in respiratory surface 14. C A stronger cardiac muscle reduce heartbeatrates 15. D Semen = sperm + seminal fluid 16. A Primary Sexual characteristics arecontrolled by Pituary Gland Secondary sexual characteristics arecontrolled by sex hormone 17. D Beating of cilia move EGG to the uterus 18. B Maternal blood has high Oxygen content. Bydiffusion, you know wt to do. 19. D 1 = gastric juice 2 = pancreatic juice 3 =intestinal juice 20. D Large intestine is responsible forabsorption of water from undigested food 21. A Left ventricle contract à increase in pressure of ventricle (Volume decrease) 22. D

Pressure of aorta > ventricle(semi-lunar close) Pressure of ventricle < atrium (bicuspidopen) 23. A/C A: elastic wall of arteries maintain highblood pressure C: Volume of Blood decreaseàpressure decrease 24. A Soil erosionàloose soil 25. C Avian flu = poetry 26. A 27. B Damage of SN blocks the nerve pathway toIN. Hence no response 28. A Voluntary + coordination 29. C Net decrease in Oxygen 30. D Particles has more average kinetic energy 31. D Refer to http://en.wikipedia.org/wiki/Chromosome 32. A Vasoconstriction of blood arterioles Less blood flow to arteriole supplyingsweat gland 33. C Ligament is elastic to absorb shock 34. B Inelasticà prevent storing of elastic potential energy 35. C Toxinà kill pest 36. B The key of the question is PRIMARY STUDENT Primary student does not have high risk ofgetting Heart attack 37. C Nitrogen Fixation: Nitrogen à Nitrate Decomposition: Complex proteinà Ammonium Salt 38. B Step 3 is feeding 39. D Refer to http://en.wikipedia.org/wiki/DNA(for nucleic acid) 40. A Salinity of Soil increases 41.D Dissolveàquick diffusion

42. A Aerobic Respiration is stimulated 43. Grow ON neighbouring plant 44. D 45. B Contraction of smooth muscle along lymphvessel helps propel lymph 46. D Root hair will respire 47. B The plant is HERBACEOUS plant. It issupported by turgidity 48. B 49. C 50. D 51. A Different genotype is shown 52. B Tubal ligation = 99 % 53. C Exchange of CO through Placenta 54. B O2 is the varying factor 55. B Since there is no photosynthesis Dry mass keeps decreasing 56. C 57. A Y contracted Hepatitis B before. There ismemory developed by memory cell 58. B Male and Down’s syndrome 59. C Positive phototropic 60. A. Test that the tip is sensitive to light