Take 5 chapter-wise practice tests plus 1 full module test on Respiration in Plants for NEET with +4/-1 scoring, answer review, and concise explanations.
Attempt 5 focused practice tests and 1 mixed module test for Respiration in Plants with 25 original NEET-style MCQs in each practice set.
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1. Respiration in plants is essentially the:
Explanation: Respiration releases energy by oxidizing organic substrates.
2. The immediate substrate most commonly used in respiration is:
Explanation: Glucose is the standard respiratory substrate used to explain the pathway.
3. Plants exchange respiratory gases mainly by:
Explanation: Respiratory gases move by diffusion through stomata, lenticels, and cell spaces.
4. Respiration is essential because it supplies:
Explanation: Respiration generates ATP required for cellular work.
5. Complete aerobic respiration of one glucose molecule uses:
Explanation: Aerobic respiration uses oxygen as the final oxidant.
6. Complete aerobic respiration produces:
Explanation: Full oxidation yields CO2, H2O, and ATP energy.
7. Most usable energy from respiration is trapped in:
Explanation: ATP is the immediate usable energy currency of the cell.
8. Major respiratory reactions in eukaryotic cells occur in:
Explanation: Glycolysis occurs in cytoplasm, while later stages occur in mitochondria.
9. A key point about plant respiration is that plants:
Explanation: Plants respire day and night, though photosynthesis occurs only in light.
10. The ratio of CO2 evolved to O2 consumed is called:
Explanation: RQ helps infer the type of respiratory substrate being used.
11. RQ for carbohydrate respiration is usually:
Explanation: For glucose, CO2 evolved equals O2 consumed, so RQ is 1.
12. RQ less than 1 often indicates respiration of:
Explanation: Fats require more oxygen relative to CO2 released, giving RQ below 1.
13. RQ greater than 1 is commonly seen when the substrate is:
Explanation: Organic acids can yield an RQ greater than 1.
14. Respiration is described as catabolic because it:
Explanation: Catabolism involves breakdown reactions that release energy.
15. Which statement is correct?
Explanation: All living plant cells require ATP generated by respiration.
16. Stomata mainly aid gas exchange in:
Explanation: Leaf stomata enable exchange of oxygen and carbon dioxide.
17. Lenticels help respiration mainly in:
Explanation: Lenticels permit gaseous exchange in woody plant organs.
18. Respiration occurs in plants at the level of:
Explanation: Every living cell requires energy and therefore respires.
19. The best summary of plant respiration is:
Explanation: This captures the physiological meaning of respiration in plants.
20. The strongest final line is:
Explanation: This is the most useful high-level revision statement.
21. ATP produced in respiration is used for:
Explanation: ATP powers biosynthesis, transport, growth, repair, and other processes.
22. Respiration and photosynthesis are related because:
Explanation: Photosynthesis builds energy-rich compounds, respiration breaks them down.
23. Apart from glucose, plants may also respire:
Explanation: Different substrates can enter respiration depending on need and state.
24. Which pair is correctly matched?
Explanation: RQ is defined as the ratio of CO2 released to O2 used.
25. The cleanest exam takeaway is:
Explanation: These are the most tested foundational ideas.
26. A germinating seed shows RQ close to 0.7. The best inference is that it is mainly respiring:
Explanation: Fat respiration consumes proportionally more oxygen, so the RQ is below 1.
27. Glycolysis takes place in the:
Explanation: Glycolysis is the cytosolic pathway that begins glucose breakdown.
28. The end product of glycolysis is:
Explanation: Glycolysis converts glucose into pyruvate.
29. Glucose first becomes reactive in glycolysis after:
Explanation: Early phosphorylation steps help trap and activate glucose.
30. One molecule of glucose yields how many molecules of pyruvate in glycolysis?
Explanation: Six-carbon glucose is split into two three-carbon pyruvate molecules.
31. Glycolysis is also known as:
Explanation: EMP stands for Embden-Meyerhof-Parnas pathway.
32. A direct ATP-producing step in glycolysis is an example of:
Explanation: ATP is formed directly from a high-energy substrate intermediate.
33. Net ATP gain from glycolysis per glucose molecule is:
Explanation: Four ATP are formed but two are invested, giving a net gain of two.
34. Glycolysis also produces:
Explanation: Oxidation steps in glycolysis generate NADH.
35. Pyruvate links glycolysis with later stages of respiration because it can:
Explanation: Under aerobic conditions pyruvate enters mitochondrial metabolism.
36. In anaerobic conditions, pyruvate may be converted into:
Explanation: Different anaerobic pathways process pyruvate differently.
37. Alcoholic fermentation commonly produces:
Explanation: Yeast-type fermentation yields ethanol and CO2.
38. Lactic acid fermentation is associated classically with:
Explanation: Under oxygen shortage, muscle cells can convert pyruvate to lactate.
39. Fermentation is less efficient than aerobic respiration because:
Explanation: Fermentation stops at partial oxidation and yields much less ATP.
40. Glycolysis can occur in both aerobic and anaerobic conditions because it:
Explanation: Oxygen is not directly consumed in glycolysis itself.
41. Fructose-1,6-bisphosphate is important because it is split into:
Explanation: The six-carbon intermediate is split into two three-carbon molecules.
42. Which pair is correctly matched?
Explanation: EMP is another name for the glycolytic pathway.
43. Glycolysis starts with:
Explanation: The pathway begins with glucose breakdown in cytoplasm.
44. Three-carbon compounds formed in glycolysis ultimately lead to:
Explanation: The triose intermediates are processed further to generate pyruvate.
45. In alcoholic fermentation, decarboxylation of pyruvate produces:
Explanation: CO2 is released during conversion of pyruvate toward ethanol formation.
46. The best summary of glycolysis is:
Explanation: This is the cleanest integrated description of glycolysis.
47. Fermentation is a form of:
Explanation: Fermentation occurs in the absence of oxygen or when oxygen is limiting.
48. Alcoholic fermentation in yeast is important industrially in:
Explanation: Yeast fermentation has major industrial applications.
49. A pathway that gives only limited ATP because it stops at pyruvate derivatives is:
Explanation: Partial oxidation yields much less ATP than full aerobic respiration.
50. Which statement is correct?
Explanation: Glycolysis is a central and widely conserved metabolic pathway.
51. The strongest final line is:
Explanation: This statement links glycolysis with the rest of respiration.
52. Why is the net ATP gain of glycolysis lower than the gross ATP formed?
Explanation: Glycolysis forms four ATP but spends two ATP first, leaving a net gain of two.
53. Pyruvate is converted to acetyl-CoA in the:
Explanation: The oxidative decarboxylation of pyruvate occurs in mitochondria.
54. Conversion of pyruvate to acetyl-CoA releases:
Explanation: A carbon is removed from pyruvate as CO2.
55. The Krebs cycle occurs in the:
Explanation: The citric acid cycle operates in the mitochondrial matrix.
56. The first stable compound formed in the Krebs cycle is:
Explanation: Acetyl-CoA condenses with oxaloacetate to form citrate.
57. Acetyl-CoA combines with oxaloacetate to form:
Explanation: This is the entry point of acetyl-CoA into the cycle.
58. A major function of the Krebs cycle is to generate:
Explanation: The cycle mainly harvests high-energy electrons.
59. Direct ATP or GTP formation in Krebs cycle is an example of:
Explanation: A small amount of ATP-equivalent is formed directly within the cycle.
60. The electron transport system is located on the:
Explanation: ETS complexes are embedded in the inner mitochondrial membrane.
61. The final electron acceptor in aerobic respiration is:
Explanation: Oxygen accepts electrons and forms water at the end of the chain.
62. The ATP formation linked to electron transport is called:
Explanation: ATP is formed using the proton gradient generated by electron transport.
63. NADH and FADH2 are important because they:
Explanation: They transfer reducing equivalents to the electron transport chain.
64. Water is produced near the end of aerobic respiration when:
Explanation: Terminal reduction of oxygen yields water.
65. Most ATP in aerobic respiration is generated during:
Explanation: The ETS and proton gradient account for most ATP production.
66. Mitochondria are called powerhouse of the cell because they:
Explanation: Major ATP generation occurs in mitochondria during aerobic metabolism.
67. Which pair is correctly matched?
Explanation: Citrate is the first stable product after acetyl-CoA entry.
68. Which statement is correct?
Explanation: Proton pumping across the inner membrane drives ATP synthesis.
69. Acetyl-CoA acts as a key link between:
Explanation: Pyruvate is converted to acetyl-CoA before entry into the citric acid cycle.
70. FADH2 generally enters electron transport at a lower energy point than:
Explanation: FADH2 donates electrons later than NADH and therefore usually yields less ATP.
71. The correct sequence of aerobic respiration stages is:
Explanation: This is the standard order of major aerobic stages.
72. The best summary of aerobic mitochondrial respiration is:
Explanation: This integrates the major mitochondrial stages clearly.
73. The Krebs cycle is also called:
Explanation: Krebs cycle and citric acid cycle refer to the same pathway.
74. Reduced coenzymes formed in Krebs cycle are mainly used for:
Explanation: Their primary role is to donate electrons to the transport chain.
75. Oxygen is essential in aerobic respiration mainly because it:
Explanation: Without oxygen, electron transport cannot proceed aerobically.
76. Which statement is correct?
Explanation: Complete oxidation of glucose carbon occurs beyond glycolysis.
77. The strongest final line is:
Explanation: This is the clearest integrated summary for this stage.
78. The final role of oxygen in aerobic respiration is to:
Explanation: Oxygen keeps electron transport running by serving as the terminal electron acceptor.
79. Respiration is called amphibolic because it:
Explanation: Respiratory intermediates can be diverted into biosynthetic pathways.
80. When fats are used in respiration, they first yield:
Explanation: Fats are hydrolyzed to glycerol and fatty acids before entering metabolism.
81. Fatty acids generally enter respiration after conversion into:
Explanation: Beta oxidation generates acetyl-CoA from fatty acids.
82. Proteins can act as respiratory substrates after conversion into:
Explanation: Proteins are broken into amino acids, then deaminated before entering pathways.
83. RQ is lowest among the following for respiration of:
Explanation: Fats require more oxygen, so their RQ is usually less than 1.
84. An RQ of about 1 suggests respiration of:
Explanation: Carbohydrate oxidation typically gives an RQ near 1.
85. Respiratory intermediates are considered amphibolic because they can be used for synthesis of:
Explanation: Many intermediates are branch points into anabolic pathways.
86. Which statement is correct?
Explanation: Plants can draw on multiple substrates depending on state and need.
87. During germination, stored reserves are respired to provide:
Explanation: Stored food supports the developing embryo until it becomes autotrophic.
88. Oil-rich seeds often show RQ values:
Explanation: Fat oxidation usually gives an RQ below 1.
89. Young actively growing tissues often respire rapidly because they need:
Explanation: Growth demands high energy and precursor supply.
90. Respiration rate generally increases with temperature up to an optimum because:
Explanation: Respiratory enzymes work faster with temperature up to a limit.
91. Very high temperature reduces respiration because:
Explanation: Beyond optimum, enzyme function declines sharply.
92. Respiration in stored fruits and vegetables is important because it affects:
Explanation: Continued respiration consumes reserves and affects ripening and storage quality.
93. Increase in respiration associated with ripening of climacteric fruits is called:
Explanation: Many fruits show a characteristic rise in respiration during ripening.
94. Which pair is correctly matched?
Explanation: Fatty acids enter respiration after conversion to acetyl-CoA.
95. Respiration is essential even in non-photosynthetic plant parts because they need:
Explanation: Roots, seeds, and flowers require ATP even without photosynthesis.
96. The term amphibolic best highlights that respiration:
Explanation: Respiratory pathways both degrade substrates and feed biosynthesis.
97. Which statement is correct?
Explanation: Oil seeds rely heavily on fat metabolism during germination.
98. The best summary of substrate flexibility is:
Explanation: This captures substrate flexibility and its exam relevance.
99. High respiration in harvested produce generally tends to:
Explanation: Respiration consumes reserves and accelerates deterioration.
100. A lower storage temperature often prolongs shelf life because it:
Explanation: Cooler conditions usually slow respiratory enzyme activity.
101. A major significance of amphibolic behavior is that respiratory intermediates can support synthesis of:
Explanation: Catabolic pathways feed into anabolic pathways.
102. Which statement is correct?
Explanation: Respiration is both energetic and integrative in metabolism.
103. The strongest final line is:
Explanation: This is the cleanest integrated end-line for this section.
104. Fermentation can continue without oxygen because it regenerates:
Explanation: Without NAD+ regeneration, glycolysis would stop under anaerobic conditions.
105. During aerobic respiration, most ATP is generated in:
Explanation: The electron transport chain drives the major ATP yield.
106. Respiration rate in actively growing tissues is high because such tissues need:
Explanation: Growth demands energy and metabolic intermediates.
107. If oxygen becomes limiting in a plant tissue, pyruvate may be diverted into:
Explanation: Low oxygen shifts metabolism toward anaerobic routes.
108. Which pair is correctly matched?
Explanation: Oxidative phosphorylation is linked to electron transport in mitochondria.
109. Which statement is correct?
Explanation: Respiration is a staged and integrated pathway.
110. The first stage common to both aerobic and anaerobic respiration is:
Explanation: Both pathways begin with glycolytic breakdown of glucose.
111. The efficiency of aerobic respiration is higher than fermentation because aerobic respiration:
Explanation: Complete oxidation captures far more usable energy.
112. The term 'powerhouse' for mitochondria is justified because they:
Explanation: Mitochondria generate the bulk of ATP in aerobic conditions.
113. A low RQ in a germinating oily seed suggests that the seed is respiring mainly:
Explanation: Fats yield RQ values below 1.
114. The best one-line comparison is:
Explanation: This is the most useful integrated comparison of the respiratory stages.
115. Plant cells in roots respire because roots:
Explanation: Respiration is required in all living plant tissues.
116. Storage organs respire slowly in dormancy, but rate rises during active growth because:
Explanation: Growth and mobilization of reserves increase respiratory demand.
117. A harvested fruit with high respiration will usually:
Explanation: Higher respiration often shortens post-harvest life.
118. Which statement is correct?
Explanation: Respiration influences multiple plant processes beyond simple energy release.
119. The strongest integrated summary is:
Explanation: This is the best full-chapter summary for NEET revision.
120. Acetyl-CoA enters which cycle?
Explanation: Acetyl-CoA condenses with oxaloacetate to begin the Krebs cycle.
121. The main significance of ETS is that it:
Explanation: Electron transfer powers proton pumping across the inner membrane.
122. A student comparing RQ values should conclude that substrate identity affects:
Explanation: RQ varies with the chemical nature of the substrate being respired.
123. Which pair is correctly matched?
Explanation: Oxygen is the terminal electron acceptor in aerobic respiration.
124. The cleanest exam takeaway is:
Explanation: This is the best strategic revision lens for the chapter.
125. The stage that directly gives pyruvate is:
Explanation: Pyruvate is the end product of glycolysis.
126. The stage most directly linked with NADH oxidation is:
Explanation: NADH donates electrons into the electron transport chain.
127. Aerobic respiration gives much more ATP than fermentation mainly because:
Explanation: Complete oxidation plus ETS-driven ATP synthesis provides much larger yield.
128. Which statement is correct?
Explanation: Respiration is fundamentally an energy-conversion process.
129. The strongest final revision line is:
Explanation: This gives the best complete chapter summary in one line.
130. Which statement best explains why mitochondria produce most ATP?
Explanation: The major ATP yield comes from chemiosmotic coupling across the inner mitochondrial membrane.