Most important questions for class 10th science, chapter 6

  1. State any one difference between autotrophic and heterotrophic modes of nutrition.                                                                                                     
  2. Name the process in plants where water is lost as water vapour.
  3. Why do aquatic animals breathe faster than the terrestrial animals? 
  4. What will happen to a plant if its xylem is removed?                  
  5. Name the tissue which transports soluble products of photosynthesis in a plant.                                                                                                         
  6. What is the mode of nutrition in human beings?                             
  7. What is the role of saliva in the digestion of food?   
  8. Name the tissue which transport water and mineral in a plant.                
  9. How do autotrophs obtain CO2 and N2 to make their food?      
  10. Which enzyme present in saliva breaks down starch?       
  11. Name the excretory unit of a kidney.                                               
  12. Name the mode of nutrition in Amoeba.                                       
  13. Name the respiratory organs of animals like fish that live in water.               
  14. Write the mode of nutrition in fungi.                                                  
  15. Name the vestigial part of human alimentary canal.                                                
  16. Name two photosynthetic pigments belonging to chlorophyll.
  17. What is photolysis of water?
  18. Name the only natural process that gives out oxygen for respiration of all living organisms.
  19. What is NADPH?
  20. What are the functions of saliva?
  21. State one function of the mucus membrane inside the nasal passage.
  22. What are the end products of respiration?
  23. What are the end products of fat digestion?
  24. Why is the rate of photosynthesis more during a bright sunny day as compound to a cloudy day?
  25. What is transpiration?
  26. What is translocation?
  27. What is a guard cell?
  28. Name the U-shaped tubule of nephron.
  29. Name the cells where CO2 is converted into carbohydrates.
  30. Name the structure of the kidney where glomerulus are enclosed.
  31. What is a sphygmomanometer?
  32. Give one functional difference between RBC and WBC.
  33. Why is blood called a liquid connective tissue?
  34. Point out differences between an artery and a vein.      
  35. What is the role of HCL in protein digestion?        
  36. Give two protein digesting enzymes of pancreatic juice with their action.
  37. Define nutrition. What are the different modes of nutrition?
  38. What are the functions of stomach?
  39. What are the functions of small intestine?
  40. What is bile? What are its constituents?
  41. Give the common features of respiratory organs of animals.
  42. Which enzyme initiates the digestion of proteins? Name the other enzyme produced by the same gland.
  43. What is dental caries?
  44. Why leaves become yellow in the absence of light?
  45. List the components of blood.
  46. What is the structural difference between the auricles and ventricles?
  47. What are the different constituents or substances present in plasma?
  48. How is the small intestine designed to absorb digested food?
  49. How are the lungs designed in human beings to maximise the area for exchange of gases?                           
  50. What is double circulation in human beings? Why is it necessary?  (HOTS) NCERT, Delhi 2008C)
  51. Write any three differences between aerobic and anaerobic respiration. (HOTS) NCERT Exemplar, NCERT) (AI 2008, Delhi 2005C,04C)
  52. What are stomata? Draw a labelled diagram of stomata. Write two functions of stomata.                                                      
  53. Draw a diagram of human alimentary canal showing duodenum, small intestine, liver and pancreas.                                                        
  54. Name the three kinds of blood vessels of human circulatory system. Write the function of each.                                                              
  55. Draw a diagram of the front view of human heart and label any six parts including at least two,  that are concerned with arterial blood supply to the heart muscles.                                                             
  56. How do plants obtain food? What are the two phases of photosynthesis?
  57. Write short notes on assimilation of proteins.
  58. Explain the process of digestion of food in mouth, stomach and small intestine in human body.                                              
  59. Name the main organs of the human digestive system in the order they participate in the process of digestion. Describe how digestion of carbohydrates and proteins take place in our body. (HOTS) (AI 2004C)
  60. Explain various digestive glands present in man.
  61. Explain with a schematic representation the exchange of gases in tissues.   (HOTS)