CBSE Guess > Papers > Important Questions > Class XI > 2013 > Biology By Mr. Sachin Prajapati

CBSE CLASS XI

Biology

51. Differentiate between Aerenchyma and Collenchyma on the basis of their structure and function.
52. Which part of stomata constitutes the stomatal apparatus?
53. What is the function of ciliated epithelium? Name the parts where this tissue can be located.
54. How many segments are present in the abdomen of cockroach?
55. What is the function of malpighian tubules?
56. Differentiate between gram positive and gram negative bacteria.
57. Give the expended form of PPLO.
58. What is Plasmodesmata?
59. State the functions of two different types of Endoplasmic Reticulum.
60. What are the functions performed by Golgi apparatus?
61. What is the function of elaioplasts and aleuroplasts?
62. Which is the largest single cell?
63. Differentiate between active and passive transport.
64. Explain the fluid mosaic model of plasma membrane with the help of a labeled diagram.
65. Diagrammatically represent the types of chromosomes based on the position of centromere.
66. What is plasmid? What is its importance?
67. What are amino acids? Name the different types of amino acids with at least one example of each.
68. Differentiate between purine and pyrimidines.
69. How a peptide bond is formed?
70. Explain the factors which affect the enzymatic activity of a protein.
71. What is the important difference between RNA and DNA in terms of nitrogen base?
72. Give the structure of Zwitter ionic form of an amino acid.
73. Explain Watson - Crick Model of DNA structure.
74. Explain the terms:-
    1. Peptide bond.
    2. Glycosidic bond.
    3. Phosphodiester bond.
75. Briefly explain the different phases of cell cycle.
76. What is the G0 phase of cell cycle?
77. Give at least two significance of meiosis.
78. What are kinetochores?
79. What is chaismata? State its significance.
80. Differentiate between mitosis and meiosis.
81. Why do generally oils remain in liquid state even in winters?
82. Why does starch give blue black color with iodine?
83. What do you understand with the term Plasmolysis?
84. Explain the mechanism of closing and opening of stomata.
85. Name the substance that impart pink colour to the root nodules of a leguminous plant and also mention its role.
86. Name one symbiotic nitrogen-fixing bacteria?
87. Explain the steps in biological nitrogen fixation in brief.
88. Describe with diagram how root nodules are formed in leguminous plants.
89. Name the factors which affect the rate of photosynthesis?
90. Which compound acts as CO₂ acceptor in Calvin cycle?
91. What are the steps that are common to C₃ and C₄ photosynthesis?
92. Differentiate between cyclic and non-cyclic photophosphorylation?
93. Define Respiratory Quotient. What is its value for fat and protein?
94. What is glycolysis? Where glycolysis does takes place in a cell? Give schematic representation of glycolysis.
95. Name the only gaseous plant hormone.
96. How does Abscisic acid acts as stress hormone in drought condition?
97. Where are Auxin generally produced in a plant? Name any one naturally occurring plant Auxin    and any one synthetic Auxin.
98. Write dental formula of man.
99. Name the fluid filled double membranous layer which surround the lungs.Also state its function.
100. What is Emphysema? Give its cause.

Submitted By Mr. Sachin Prajapati
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