Life Processes

1. What are life processes?

2. What are the different criteria to decide whether something is alive or
not? – nb
3. Define nutrition.
4. Which are the most common chemical means to break down food?
5. Define respiration.
6. Why is diffusion insufficient to meet the oxygen requirements of
multicellular organisms like humans? – nb
7. Why is there a need for a transportation system in our body?
8. What are the outside raw materials used for by an organism? – intext
9. Why do we need food for? – nb
10. How do autotrophs fulfill their energy requirements? Give 2 examples of
autotrophs.
11. How do heterotrophs fulfill their energy requirements? Give 2 examples
of heterotrophs.
12. Define the term photosynthesis. State its chemical reaction.
13. What is the internal energy reserve of plants?
14. In what form does extra food gets stored in - a) plants b) animals
15. State the steps/events taking place during photosynthesis.
16. What happens in desert plants at night? Elaborate with respect to
photosynthesis
17. Explain the mechanism of opening and closing of stomata.
18. List down the functions of stomata.
19. What is the function of the guard cells?
20. Differentiate between guard cells and epidermal cells. - nb
21. How is nitrogen taken up by the plant?
22. State the various types of heterotrophic nutrition. – nb
23. Explain the process of nutrition in amoeba. What is this process also
called? – nb
24. How does paramoecium obtain its nutrition?
25. What is alimentary canal?
26. What are enzymes? – tb
27. Which enzyme is present in saliva? What is it also called?
28. What is the function of saliva?
29. List down the function of tongue. – nb
30. Define peristalsis. – nb
31. Name the gland present in the walls of the stomach.
32. Name the substances released by the gastric glands and list down their
functions.
33. What regulates the exit of the food from the stomach?
34. Why is the small intestine fitted in a compact space?
35. Which is the longest part of the alimentary canal?
36. Herbivores have longer small intestine than carnivores. Give reason.
37. List down the functions of bile juice. – nb
38. List the functions of pancreatic juices.
39. List down the functions of the intestinal juices.
40. What are villi?
41. Explain the structure of small intestine.
42. Name the site of complete digestion of food.
43. How is the small intestine designed for the absorption of digested food?
44. What regulates the exit of the waste material from anus?
45. Differentiate between autotrophic and heterotrophic nutrition.
46. Define respiration.
47. Differentiate between breathing and anaerobic respiration. – nb
48. Define glycolysis.
49. What causes muscle cramps?
50. Draw a flowchart to show the breakdown of glucose by various
pathways.
51. What happens to plants during day and night?
52. Why do fish show a very high breathing rate in comparison to terrestrial
animals?
53. How do fish respire?
54. What is the role of mucus and fine hair in the nasal cavity?
55. What is the function of the rings of cartilage?
56. Explain the process of breathing in humans.
57. What is the significance of residual air in our lungs?
58. Name the respiratory pigment in humans.
59. How do oxygen and carbon dioxide get transported in humans?
60. When the body size of animals is large, the diffusion pressure alone
cannot take care of oxygen delivery to all parts of the body. Give reason. –
nb
61. Differentiate between villi and alveoli. – nb
62. Write a short note on blood. – nb
63. What are the various substances that are transported through blood?
64. Explain the structure of human heart.
65. Explain the working of the human heart.
66. Which is the thickest chamber in the heart?
67. Why do ventricles have thicker muscular walls than the atria do?
68. What is the function of the valves in the human heart?
69. What is the use of the separation of the left side and right side of the
heart?
70. What do you mean by double circulation? – nb
71. Explain single circulation in fish.
72. Define blood pressure.
73. Define systolic and diastolic pressure.
74. What is the normal systolic and diastolic pressure?
75. Name the instrument that measures BP.
76. What is the cause of hypertension? State its effects.
77. Why do arteries have thick, elastic walls?
78. Why do veins have valves instead of thick walls?
79. What happens to an artery on reaching an organ?
80. Differentiate between artery and vein. – nb
81. Mention the role of platelets.
82. How is lymph formed?
83. Write a short note on lymph.
84. Why is lymph called tissue fluid/extracellular fluid? – nb
85. What is the function of lymph?
86. What are the raw materials required by plants?
87. A proper system of transportation is essential in tall trees. Give reason.
88. Plants have low energy needs. Give reason.
89. Explain the process by which water gets transported in plants. – nb
90. Define transpiration.
91. Explain the significance of transpiration.
92. Name the driving force in plants during – a) day b) night
93. Define translocation. – nb
94. What does phloem transports?
95. Where does the translocation of food take place in the phloem?
96. How is food transported in plants?
97. Define excretion.
98. Name the components of the excretory system in humans.
99. What is the purpose of making urine?
100. What are the various components of urine?
101. Name the functional unit of kidney.
102. List down the functions of nephron.
103. List down the functions of kidney.
104. The amount of water re absorbed depends on?
105. List the various ways by which plants perform excretion. – nb