51. The photosystems are named according to:
Answer: B. the order in which they were discovered
Biology Class 11 Unit 4: Bioenergetics MCQs
222 multiple choice questions with the correct answer for each. Tap an option to check yourself, or switch on "Show all answers". This is page 2 of 5.
Tap an option to check your answer.
52. The first phase of photosynthesis is the:
Answer: B. light dependent phase
53. The light dependent phase occurs in the:
Answer: B. thylakoid membranes
54. The products of the light reactions are:
Answer: B. ATP, NADPH and oxygen
55. ATP is called the assimilating power and NADPH is called the:
Answer: C. reducing power
56. The light independent phase occurs in the:
Answer: C. stroma
57. The output of the light independent phase is:
Answer: C. glyceraldehyde-3-phosphate (G3P)
58. ATP production during the light reaction is called:
Answer: C. photophosphorylation
59. The mechanism of ATP production in the light reaction is called:
Answer: B. chemiosmosis
60. In non-cyclic photophosphorylation the electrons:
Answer: B. do not return but are finally accepted by NADP plus
61. The most important event of the light reaction is the production of:
Answer: B. ATP
62. Non-cyclic photophosphorylation uses:
Answer: C. both photosystem I and II
63. When two photons strike PS-II, electrons are captured by the:
Answer: C. primary electron acceptor
64. The electron holes of P680 are filled by electrons from:
Answer: C. water by photolysis
65. The electron holes of P700 are filled by electrons from:
Answer: B. P680 via the electron transport chain
66. The proton gradient formed in thylakoid space activates:
Answer: B. ATP synthase
67. Ferredoxin is:
Answer: B. an iron-containing protein
68. The enzyme that transfers electrons from ferredoxin to NADP plus is:
Answer: C. NADP reductase (a flavoprotein)
69. NADP plus combines with electrons and H plus to form:
Answer: B. NADPH
70. The zigzag path of electrons in non-cyclic photophosphorylation is called the:
Answer: C. Z-scheme
71. In cyclic photophosphorylation only which photosystem is used?
Answer: B. Photosystem I
72. In cyclic photophosphorylation there is:
Answer: D. only ATP production with no NADPH and no oxygen
73. Cyclic electron flow occurs when the cell needs:
Answer: B. more ATP, until ATP supply meets demand
74. The Calvin cycle is also known as the:
Answer: B. C3 pathway
75. Melvin Calvin won the Nobel Prize in:
Answer: C. 1961
76. The three phases of the Calvin cycle are:
Answer: B. carbon fixation, reduction and regeneration of RuBP
77. RuBP is a:
Answer: C. five-carbon phosphorylated sugar and CO2 acceptor
78. The enzyme that fixes CO2 to RuBP is:
Answer: B. RuBisCO
79. The unstable six-carbon compound formed after CO2 combines with RuBP splits into:
Answer: B. two molecules of 3-phosphoglycerate (3-PGA)
80. The first stable compound of the Calvin cycle is:
Answer: C. 3-PGA
81. In the reduction phase 3-PGA reacts with:
Answer: B. ATP and is reduced by NADPH to form G3P
82. Out of six G3P molecules made in the Calvin cycle, the number released from the cycle is:
Answer: C. one
83. The remaining five G3P are used to regenerate:
Answer: C. RuBP (through ribulose phosphate)
84. To release one G3P, the Calvin cycle uses:
Answer: B. 3 CO2, 6 NADPH and 9 ATP
85. To produce one glucose molecule, the number of G3P required is:
Answer: B. two
86. Plants in which only the Calvin cycle occurs in the dark reaction are called:
Answer: B. C3 plants
87. Cellular respiration is a series of complex:
Answer: B. oxidation-reduction reactions by which cells obtain energy from organic matter
88. Respiratory fuel in most cells is:
Answer: C. glucose
89. In both aerobic and anaerobic respiration glucose is first broken down into:
Answer: B. two molecules of pyruvate
90. The ATP yield of aerobic respiration in eukaryotes is:
Answer: C. 36 ATP
91. The ATP yield of aerobic respiration in prokaryotes is:
Answer: B. 38 ATP
92. The ATP yield of anaerobic respiration is:
Answer: C. 2
93. Anaerobic respiration is also known as:
Answer: B. fermentation
94. The two types of fermentation are:
Answer: B. lactic acid fermentation and alcoholic fermentation
95. In lactic acid fermentation, pyruvate is reduced by NADH to form:
Answer: B. lactic acid
96. Lactic acid fermentation occurs in:
Answer: B. anaerobic bacteria and mammalian muscles during strenuous exercise
97. Muscle fatigue is caused by accumulation of:
Answer: C. lactic acid
98. Alcoholic fermentation is found in:
Answer: B. yeast
99. In alcoholic fermentation pyruvate is first decarboxylated to:
Answer: C. acetaldehyde
100. The end products of alcoholic fermentation are:
Answer: B. ethanol and carbon dioxide
About Biology Class 11 Unit 4 MCQs (Federal Board)
These 222 Biology MCQs cover Class 11 Unit 4: Bioenergetics of the Federal Board (FBISE) HSSC-I (1st Year / Class 11) syllabus. They are SLO-based MCQs as per the new pattern for FBISE exams. Each question has four options and the correct answer is shown, so you can practise for the annual examination and find the topics you still need to revise. The questions are split over 5 pages of 50. Use the Print button to save this chapter as a PDF.