Life Processes Worksheet-17

Life Processes Worksheet-17

31. How are fats digested in our bodies? Where does this process take place?

32. What is the role of saliva in the digestion of food?

33. How are the alveoli designed to maximise the exchange of gases?

34. What are the differences between the transport of materials in xylem and phloem?

35. Draw the diagram of a palisade cell of a plant leaf and label the following in it :

(i) Chloroplast      (ii) Vacuole   (iii) Cytoplasm       (iv) Nucleus

36. (a) Draw diagram of a Stomata when it is open. (b) Label Epidermal cell, Guard cell, Chloroplast and Stomatal opening on the diagram drawn.

37. Write the functions of the following in the digestive process :

(i) Bile

(ii) Bicarbonate secreted by the duodenal wall.

(iii) Pancreatic amylase.

38. Give reasons for the following :

(i) The glottis is guarded by epiglottis.

(ii) The lung alveoli are covered with blood capillaries.

(iii) The wall of trachea is supported by cartilage rings.

39. Draw a diagram of the human respiratory system and label the following in it:

(i) Lungs            (ii) Primary bronchus

(iii) Trachea      (iv) Larynx

40. Name the three kinds of cells present in blood. Write one function of each of them.

41. Draw a diagram of human alimentary canal showing duodenum, small intestine, liver and pancreas.

                              OR

State the role of following in the human respiratory system:

(a) Nasal cavity          (b) Diaphragm (c) Alveoli

42. Define the terms 'excretion' and 'osmoregula-tion'. Name the excretory unit of the following:

(a) Amoeba       (b) Earthworm

43. Explain the role of the following in the process of digestion in the human body.

(a) Saliva           (b) Gastric juices                (c) Trypsin

                   OR

Draw a diagram of the human respiratory system showing larynx, trachea, primary bronchus and lungs.

44. How does blood circulate between lungs and heart in human beings? Give two functions of lymph in human body.

45. Name the constituents of blood. Why are white blood corpuscles called 'soldiers of the body'?

46. List two vital functions of the human kidney. Draw a labelled diagram of an artificial kidney.

47. List three points of distinction between aerobic and anaerobic respiration.

48. Name the three kinds of blood vessels of human circulatory system. Write the function of each.

49. Give three points of difference between respiration in plants and respiration in animals.

50. Define 'breathing' Explain the mechanism of breathing in human beings.

51. How do each of the following factors affect the productivity in the process of photosynthesis?

(i) Temperature         (ii) Water         (iii) Carbon dioxide

52. What happens to glucose, which enters the nephron along with filtrate during excretion in human being? State two vital functions of kidney.

53. How do plants obtain their food? What are the two phases of photosynthesis? Draw a labelled diagram of Calvin-Benson cycle.

54. (a) Describe the mechanism of breathing in human beings.

(b)    (i) Under normal conditions, what is the rate of breathing per minute?

          (ii) Why does the rate of breathing increase by 20 to 25 times during vigorous exercise?

55. Explain the process by which inhalation occurs during breathing in human beings.

56. Leaves of a healthy potted plant were coated with vaseline to block the stomata. Will this plant remain healthy for long? State three reasons for your answer.

57. What is the function of epiglottis in man? Draw a labeled diagram showing the human respiratory system.

58. (i) Why is circulation of blood in man known as double circulation?

(ii) Which blood cell in human blood carries haemoglobin? What is its average life span?

59. Distinguish between aerobic and anaerobic respiration in terms of end products and energy released. Why do smokers develop an over stained heart?

60. Give the function of lymph.