Biology Today - May 2018

(a) SA node → Purkinje fibres → bundle of His → AV

node → heart muscles

(b) SA node → AV node → bundle of His → Purkinje

fibres → heart muscles

(c) AV node → bundle of His → SA node → Purkinje

fibres → heart muscles

(d) AV node → SA node → Purkinje fibres → bundle of

His → heart muscles

44. Bundle of His is a network of
    (a) muscle fibres distributed throughout the heart walls
    (b) muscle fibres found only in the ventricle wall
    (c) nerve fibres distributed in ventricles
    (d) nerve fibres found throughout the heart.


45. If due to some injury the chordae tendinae of the tricuspid
    valve of the human heart is partially non-functional, what
    will be the immediate effect?
    (a) The flow of blood into the aorta will be slowed down.
    (b) The ‘pacemaker’ will stop working.
    (c) The blood will tend to flow back into the left atrium.
    (d) The flow of blood into the pulmonary artery will be reduced.


46. The hepatic portal vein drains blood to liver from
    (a) stomach (b) kidneys
    (c) intestine (d) heart. (NEET 2017)


47. In the given figure of the heart which of the marked
    structure (A, B, C, D, E) carries oxygenated blood?

(a) A, B, C and D (b) A and E

(c) A and D (d) C and E

48. Read the statements A and B and select the correct option
    Statement A : Atherosclerosis is a disease characterised
    by the thickening of arterial walls.
    Statement B : Deposition of cholesterol and triglycerides
    in the arterial walls causes atherosclerosis.
    (a) Both statements A and B are correct and B is the
    correct explanation of A.
    (b) Both statements A and B are correct but B is not the
    correct explanation of statement A.
    (c) Statement A is correct but B is incorrect.
    (d) Both statements A and B are incorrect.


49. An artificial pacemaker is implanted sub-cutaneously and
    connected to the heart in patients
    (a) having 90% blockage of the three main coronary arteries
    (b) having a very high blood pressure
    (c) with irregularity in the heart rhythm
    (d) suffering from arteriosclerosis. (AIIMS 2017)


50. In order for the blood to flow from right ventricle to left
    ventricle in mammalian heart, it must flow through
    (a) right ventricle, pulmonary arteries, lungs, pulmonary
    veins, left atrium
    (b) right ventricle, pulmonary veins, lungs, pulmonary
    arteries, left atrium
    (c) right ventricle, right atrium, lungs, pulmonary veins, left
    atrium
    (d) right ventricle, systemic aorta, lungs, pulmonary veins,
    left atrium
    ANSWER KEY


51. (c) 2. (b) 3. (d) 4. (d) 5. (c)


52. (d) 7. (a) 8. (d) 9. (a) 10. (b)


53. (a) 12. (c) 13. (c) 14. (d) 15. (c)


54. (b) 17. (c) 18. (d) 19. (a) 20. (a)


55. (c) 22. (b) 23. (a) 24. (d) 25. (b)


56. (a) 27. (b) 28. (a) 29. (a) 30. (b)


57. (b) 32. (b) 33. (a) 34. (c) 35. (c)


58. (d) 37. (b) 38. (b) 39. (b) 40. (b)


59. (a) 42. (b) 43. (b) 44. (b) 45. (d)


60. (a,c) 47. (c) 48. (a) 49. (c) 50. (a)
    

Contributed by : Shalaka Deo (Nagpur, Maharashtra)

SOLUTIONS TO APRIL 2018 CROSSWORD

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3

9

12

15

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13
14
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A. Molecular farming

B. Herdmania

C. Prof. Karl von Frisch

D. Sella turcica

E. Orthodox seed

RIDDLE SOLUTIONS April 2018