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NEET Exam  >  NEET Test  >  Biology Class 11  >  32 Years NEET Previous Year Questions: Respiration in Plants - 2 - NEET MCQ

32 Years NEET Previous Year Questions: Respiration in Plants - 2 Free MCQ


MCQ Practice Test & Solutions: 32 Years NEET Previous Year Questions: Respiration in Plants - 2 (19 Questions)

You can prepare effectively for NEET Biology Class 11 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "32 Years NEET Previous Year Questions: Respiration in Plants - 2". These 19 questions have been designed by the experts with the latest curriculum of NEET 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 25 minutes
  • - Number of Questions: 19

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32 Years NEET Previous Year Questions: Respiration in Plants - 2 - Question 1
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Oxidative phosphorylation involves simultaneous oxidation and phosphorylation to finally form [1996]

Detailed Solution: Question 1

Oxidative phosphorylation is the synthesis of energy rich ATP from ADP and  inorganic phosphate, that is connected to oxidation of reduced coenzymes produced in cellular  respiration.

Topic in NCERT: Oxidative phosphorylation

Line in NCERT: "it is for this reason that the process is called oxidative phosphorylation."

32 Years NEET Previous Year Questions: Respiration in Plants - 2 - Question 2
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Respiratory quotient (R.Q.) for fatty acid is [1995]

Detailed Solution: Question 2

Respiratory quotient (R.Q.) is defined as the ratio of the molecules of carbon dioxide given out to the number of oxygen molecules taken in during respiration. Its value for fatty acids is always less than unity.

Topic in NCERT: Respiratory quotient

Line in NCERT: "when fats are used in respiration, the rq is less than 1."

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32 Years NEET Previous Year Questions: Respiration in Plants - 2 - Question 3
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In animal cells, the first stage of glucose breakdown is [1994]

Detailed Solution: Question 3

Glycolysis is the first step of respiration which occurs without requirement of O2 and is common to both aerobic and anaerobic modes of respiration.

Topic in NCERT: Glycolysis

Line in NCERT: "the initial stage of cellular respiration takes place in the cytoplasm. each glucose molecule is broken through a series of enzyme catalysed reactions into two molecules of pyruvic acid. this process is called glycolysis."

32 Years NEET Previous Year Questions: Respiration in Plants - 2 - Question 4
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Respiratory substrate yielding maximum number of ATP molecule is [1994]

Detailed Solution: Question 4

Firstly, amylose and glycogen are converted to glucose. Deamination of ketogenic amino acids occur and these enter respiratory catabolism as intermediates.

Topic in NCERT: Amphibolic pathway

Line in NCERT: "glucose is the favoured substrate for respiration."

32 Years NEET Previous Year Questions: Respiration in Plants - 2 - Question 5
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Fermentation products of Yeast are [1994, 97]

Detailed Solution: Question 5

End products of fermentation are ethyl alcohol, lactic acid and CO2.

Topic in NCERT: Fermentation

Line in NCERT: "in fermentation, say by yeast, the incomplete oxidation of glucose is achieved under anaerobic conditions by sets of reactions where pyruvic acid is converted to co2 and ethanol."

32 Years NEET Previous Year Questions: Respiration in Plants - 2 - Question 6
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Maximum amount of energy/ATP is liberated on oxidation of [1994]

Detailed Solution: Question 6

Fats are used as respiratory substrates by a number of organisms because they contain more energy as compared to carbohydrates.

Topic in NCERT: Respiratory quotient

Line in NCERT: "when fats are used in respiration, the rq is less than 1."

32 Years NEET Previous Year Questions: Respiration in Plants - 2 - Question 7
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Life without air would be [1993]

Detailed Solution: Question 7

In Anaerobic respiration, oxygen is not used in the breakdown of respiratory substrate.

32 Years NEET Previous Year Questions: Respiration in Plants - 2 - Question 8
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Out of 38 ATP molecules produced per glucose, 32 ATP molecules are formed from NADH/FADH2 in [1993]

Detailed Solution: Question 8

Complete degradation of a molecule of glucose yields 38 ATP molecules.

Topic in NCERT: Electron transport system (ets) and oxidative phosphorylation

Line in NCERT: "the following steps in the respiratory process are to release and utilise the energy stored in nadh+h* and fadh2. this is accomplished when they are oxidised through the electron transport system and the electrons are passed on to o2 resulting in the formation of h2o."

32 Years NEET Previous Year Questions: Respiration in Plants - 2 - Question 9
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End product of citric acid/Krebs cycle is [1993]

Detailed Solution: Question 9

The two molecules of pyruvate are completely degraded in Krebs cycle to form two molecules of ATP, 8 NADH2, 2 FADH2, CO2 and water.

Topic in NCERT: Tricarboxylic acid cycle

Line in NCERT: "the summary equation for this phase of respiration may be written as follows: nadh+h nad* coa pyruvate (3c) -nad* nadh+h co2 acetyl coenzyme a (2c) oxaloacetic acid (4c) citric acid (6c) co2 nad* nadh+h α-ketoglutaric acid malic acid (4c) citric acid cycle fadh2 fad* cer (5c) co2 nad nadh+h succinic acid (4c) gdp gtp citric acid cycle"

32 Years NEET Previous Year Questions: Respiration in Plants - 2 - Question 10
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Terminal cytochrome of respiratory chain which donates electrons to oxygen is [1992]

Detailed Solution: Question 10

Terminal cytochorome is cyt a3. cyt a3 posseses two copper centers. It helps in transfer of electrons to oxygen.

Topic in NCERT: Respiration in plants

Line in NCERT: "o2 is the ultimate acceptor of electrons and it gets reduced to water."

32 Years NEET Previous Year Questions: Respiration in Plants - 2 - Question 11
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When one glucose molecule is completely oxidised, it changes [1992]

Detailed Solution: Question 11

Historically it was believed that 38 ATP is produced from 38 ADP. But the current estimate is that about 30 molecules of ATP are formed when glucose is completely oxidised to CO2

Topic in NCERT: Aerobic respiration

Line in NCERT: "hence, there can be a net gain of 38 atp molecules during aerobic respiration of one molecule of glucose."

32 Years NEET Previous Year Questions: Respiration in Plants - 2 - Question 12
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Oxidative phosphorylation is production of  [1992]

Detailed Solution: Question 12

Oxidative phosphorylation is the synthesis of energy rich ATP molecules with the help of energy liberated during  oxidation of reduced co-enzymes produced in respiration.

Topic in NCERT: Oxidative phosphorylation

Line in NCERT: "this is called oxidative phosphorylation. in this process o2 is the ultimate acceptor of electrons and it gets reduced to water."

32 Years NEET Previous Year Questions: Respiration in Plants - 2 - Question 13
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End products of aerobic respiration are [1992]

Detailed Solution: Question 13

Aerobic respiration is an enzymatically controlled release of energy in a stepwise catabolic process of complete oxidation of organic substrate into CO2 and H2O with O2 acting as terminal oxidant.

Topic in NCERT: Cellular respiration

Line in NCERT: "c6h12o6 + 6o2 → 6co2 + 6h2o + energy"

32 Years NEET Previous Year Questions: Respiration in Plants - 2 - Question 14
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Connecting link between glycolysis and Krebs cycle is/before entering Krebs cycle pyruvate is changed to [1990, 92, 97]

Detailed Solution: Question 14

The end product of glycolysis is pyruvate. It enters mitochondria and is oxidatively decarboxylated to acetyl CoA before entering into Krebs cycle.

Topic in NCERT: Cellular respiration and metabolism

Line in NCERT: "pyruvate, which is formed by the glycolytic catabolism of carbohydrates in the cytosol, after it enters mitochondrial matrix undergoes oxidative decarboxylation by a complex set of reactions catalysed by pyruvic dehydrogenase."

32 Years NEET Previous Year Questions: Respiration in Plants - 2 - Question 15
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EMP can produce a total of ATP.

Detailed Solution: Question 15

Option B is correct.

The Embden-Meyerhof-Parnas (EMP) pathway (glycolysis) yields a net of 2 ATP by substrate-level phosphorylation and 2 NADH per molecule of glucose.

During oxidative phosphorylation, each NADH is taken as yielding approximately 3 ATP (P/O ≈ 3). Thus, 2 NADH × 3 ATP = 6 ATP.

Adding the substrate-level ATP and the ATP from NADH oxidation gives 2 ATP + 6 ATP = 8 ATP.

Therefore, the total ATP produced (counting ATP generated from the 2 NADH) by the EMP pathway is 8 ATP, so Option B is correct.

32 Years NEET Previous Year Questions: Respiration in Plants - 2 - Question 16
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R.Q. is ratio of [1990]

Detailed Solution: Question 16

Ratio of the volume of CO2 produced to the volume of O2 consumed in respiration over a period of time is known as respiratory quotient.

Topic in NCERT: Respiratory quotient

Line in NCERT: "the ratio of the volume of co2 evolved to the volume of o2 consumed in respiration is called the respiratory quotient (rq) or respiratory ratio."

32 Years NEET Previous Year Questions: Respiration in Plants - 2 - Question 17
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End product of glycolysis is [1990]

Detailed Solution: Question 17

The end product of glycolysis is pyruvic acid which is a three carbon compound.

Topic in NCERT: Respiration in plants

Line in NCERT: "pyruvic acid is then the key product of glycolysis."

32 Years NEET Previous Year Questions: Respiration in Plants - 2 - Question 18
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Incomplete oxidation of glucose into pyruvic acid with several intermediate steps is known as[1988]

Detailed Solution: Question 18

Glycolysis involves the process of partial oxidation of glucose or similar hexose sugar into two molecules of pyruvic acid through a series of ten enzyme mediated reactions. It occurs in cytoplasm.

Topic in NCERT: Metabolism of pyruvic acid

Line in NCERT: "metabolism of two molecules of pyruvic acid (produced from one glucose molecule during glycolysis)."

32 Years NEET Previous Year Questions: Respiration in Plants - 2 - Question 19
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 R.Q. is represented by [1988]

Detailed Solution: Question 19

Respiratory Quotient 

Topic in NCERT: Respiratory quotient

Line in NCERT: "the ratio of the volume of co2 evolved to the volume of o2 consumed in respiration is called the respiratory quotient (rq) or respiratory ratio."

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This test contains 19 MCQs on 32 Years NEET Previous Year Questions: Respiration in Plants - 2 with detailed solutions for each question. It is part of the Biology Class 11 course on EduRev, designed to align with the current NEET syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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