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Khub.info Learn TNPSC exam and online pratice
Q1. Milk teeth in a child of 3-4 years do not include
Q2. One of the digestive juices that lacks enzymes but aids digestion is
Q3. If you are standing on your head, the apple being chewed in the mouth
Q4. Prior to absorption, grape sugar is hydrolysed by the enzyme
Q5. Like other body cells, the epithelial cells lining the stomach are protein in nature. Yet the epithelial lining is not digested by the powerful proteolytic enzyme secreted by the stomach because
Q6. Some consumers think it dangerous to eat pork as
Q7. Honey is formed by
Q8. A few drops of saccharine (sweetex) solution spilled on the floor attracts
Q9. Some states in India have imposed a ban on the con­sumption of kesari dal (Lathyrus sativus) because it causes gradual loss of
Q10. The Central Rice Research Institute of India is located at
Q11. Which one of the following is a micro-element?
Q12. Which one of the following wavelengths of light is most effective in photosynthesis?
Q13. A solution of chlorophyll pigments looks red in reflected light because of
Q14. Which one of the following statements about pho­tosynthesis is not true?
Q15. The carbon of organic compounds in plants comes from
Q16. Which one of the following is a product of the dark reactions of photosynthesis?
Q17. Which of the following scientists was awarded Nobel Prize for his work on photosynthesis?
Q18. Green plants evolve oxygen during the day rather than carbon dioxide. This means that
Q19. "I flatter myself having discovered the method that nature employs to purify air. It is vegetation." Who is credited with this statement and discovery?
Q20. When fishes are kept in an aquarium containing water but no aquatic plants, they frequently come to the surface and float in a semi-vertical position for want of
Q21. Some animals have a unique method of bringing oxygen directly to the cells. These are
Q22. The digestive and breathing passages cross in the
Q23. The approximate per cent oxygen content of air is
Q24. Puncture of the thoracic wall but not of the lung itself will cause
Q25. On a hot sultry afternoon, a fat person sweats far more profusely than a lean one of the same height. This is due to
Q26. Muscle fatigue occurs due to the accumulation of
Q27. If a paste of rice or wheat flour is left overnight in the kitchen, its volume increases significantly because of
Q28. It is not advisable to sleep under a tree at night because of the
Q29. In case of cardiac arrest, what should be the most primary step?
Q30. The blood corpuscles that help to build up resis­tance against disease are
Q31. The life span of human red corpuscles is
Q32. The rate at which the heart beats per minute in an adult averages
Q33. Once blood clots at a wound, harmful bacteria are prevented from entering by
Q34. Venous blood is carried to the lungs for oxygenation by the
Q35. People who live at high altitudes have rosy cheeks because
Q36. The route of circulation in the human heart is
Q37. The fundamental role of root hairs in plants is
Q38. Water and mineral salts are translocated in plants in the
Q39. The transport of organic substances in plants is through
Q40. Water and mineral salts are translocated through vessels in angiosperms. The maximum length of such a vessel is
Q41. The volume of urine produced in an adult human every 24 hours is
Q42. The artificial kidney operates on the principle of
Q43. The least toxic of nitrogenous wastes is
Q44. The excreta of lizards and birds contains a white component which is chemically
Q45. The control centres that regulate hunger, water bal­ance and body temperature are located in the
Q46. The rate and force of the heartbeat, the secretion of glands of the alimentary tract and the contraction of involuntary muscles are controlled by the
Q47. The cerebellum
Q48. Encephalitis occurs when
Q49. A person will have brown eyes, blue eyes or black eyes depending upon the particular pigment present in the
Q50. While swallowing a tablet of chloroquin, one expe­riences its bitter taste when it accidentally comes in contact with the