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CBSE Questions for Class 11 Medical Biology Respiration In Plants Quiz 13 - MCQExams.com

Each molecule of pyruvic acid entering the Krebs cycle produces?
  • 2 molecules of CO2.
  • 3 molecules of CO2.
  • 1 molecules of CO2.
  • 5 molecules of CO2.
How many carbon atoms are there in substances labelled as P,Q,R and S respectively in the given representation of Krebs' cycle?
769355_2e1e8c521d84407f97517833d1969cde.JPG
  • PQRS: 4,3,6,4
  • PQRS: 3, 4, 4, 6
  • PQRS: 4,3, 4, 6
  • PQRS: 3,4,6,4
In Kreb's cycle formation of ___________________.
  • 34 ATP takes place
  • 38 ATP takes place
  • 15 ATP from each acetyl Co-A takes place
  • 12 ATP from each acetyl Co-A takes place (24 ATP)
Which one is the positive modulator of glycolysis?
  • ATP
  • ADP
  • NADH
  • FADH
Identify X, Y and Z in the given diagram of citric acid cycle and select the correct option.
770760_f22bfa8f6ba443fd92c5bbfca47e98a8.png
  • X-GTP, Y-NADH2, Z-FADH2
  • X-FADH2, Y-NADH2, Z-GTP
  • X-NADH2, Y-FADH2, Z-GTP
  • X-CO2, Y-NADH2, Z-ADP

In the conversion of pyruvic acid to acetyl coenzyme A, pyruvic acid is:
  • Oxidized
  • Reduced
  • Isomerised
  • Inactivated
Choose the correct answers from the alternatives given :
Which one of the following is the link between glycolysis and Krebs cycle?
  • Acetyl coenzyme A
  • Phosphoenolpyutvic acid
  • Citric acid
  • Acetyl acetic acid
Choose the correct answers from the alternatives given :
The first process in breaking down glucose is
  • the Krebs cycle
  • glycolysis
  • electron transport system
  • fermentation

Which process produces both NADH and FADH2?
  • Krebs cycle
  • Glycolysis
  • Electron transport system
  • Fermentation
Choose the correct answers from the alternatives given :
Which process must occur before fermentation?
  • Krebs cycle
  • Glycolysis
  • Electron transport system
  • The transition reaction
Choose the correct answers from the alternatives given :
The carbon dioxide we exhale is produced in
  • glycolysis
  • electron transport system
  • lactate fermentation
  • Krebs cycle
Acetyl-CoA is produced from
  • pyruvate and a coenzyme
  • citric acid and a coenzyme
  • ATP and pyruvate
  • CO2 and pyruvate
Fatty acids enter cellular respiration as
  • one-carbon fragments
  • two-carbon fragments
  • three-carbon fragments
  • long chain-carbon fragments
Choose the correct answers from the alternatives given :
In an eukaryotic cell, TCA cycle and electron transport system take place within
  • nucleolus
  • peroxisomes
  • mitochondria
  • stroma
Choose the correct answers from the alternatives given :
Mitochondria are called the powerhouses of the cell. Which one of the following observations supports this statement?
  • Mitochondrion is a cell organelle that possesses a double membrane
  • Mitochondria contain ATP
  • The enzymes of the Krebs cycle and the cytochromes are found in mitochondria
  • Mitochondria are found in almost all kinds of cells

Which process produces alcohol or lactate?
  • Krebs cycle
  • Glycolysis
  • Electron transport system
  • Fermentation
Choose the correct answers from the alternatives given :
The end product of alcoholic fermentation is:
  • ethanol or lactic acid
  • acetaldehyde
  • water and CO2
  • pyruvic acid
Choose the correct answers from the alternatives given :
Which of these is not true of fermentation?
  • Net gain of only two ATP
  • Occurs in cytosol
  • NADH donates electrons to electron transport system
  • Begins with glucose

The form in which carbon leaves the citric acid cycle is
  • Acetalehyde
  • Carbon dioxide
  • Ethanol 
  • None of these
Choose the correct answers from the alternatives given :
Which of these pairs of processes are anaerobic?
  • Fermentation and glycolysis
  • Fermentation and the Krebs cycle
  • Glycolysis and the Krebs cycle
  • The Krebs cycle and the electron transport system
Choose the correct answers from the alternatives given :
The citric acid cycle
  • must occur twice for each glucose molecule metabolised
  • produces 2 ATP directly from the cycle intermediates
  • produces 4 carbon dioxide molecules per glucose molecule
  • all of the above
Choose the correct answers from the alternatives given :
In a eukaryotic cell, most of the enzymes of the Krebs cycle are located in the 
  • intermembrane space
  • mitochondrial matrix
  • inner mitochondrial membrane
  • plasma membrane
The enzyme that is not found in a C3 plant is 
  • RuBP Carboxylase
  • PEP Carboxylase
  • NADP reductase
  • ATP synthase
In which of the following processes is acetyl CoA not involved?
  • Fatty acid breakdown
  • Embden-Meyerhof pathway
  • Fatty acid synthesis
  • Transamination
Fatty acids are broken down to 
  • Pyruvate molecules, which take electrons to the electron transport system
  • Amino acids, which excrete ammonia
  • Acetyl groups, which enter the Krebs cycle
  • All of the above
Choose the correct answers from the alternatives given :
The pathway of aerobic respiration is completed in the 
  • cytoplasm
  • mitochondrion
  • plasma membrane
  • nucleus
State whether the following statements are true or false.
In the conversion of pyruvic acid to acetyl coenzyme A, pyruvic acid is reduced. 
  • False
  • True
State whether the following statements are true or false.
The final electron acceptor in glycolysis is oxygen.
  • True
  • False
State whether the following statements are true or false.
Fermentation follows glycolysis in some cells when oxygen is not available.
  • True
  • False
Which statement is wrong for Kreb's cycle?
  • There is one point in the cycle where FAD+ is reduced to FADH2
  • During conversion of succinyl coA to succinic acid, a molecule of GTP is synthesised
  • The cycle starts with condensation of acetyl group (acetyl CoA) with pyruvic acid to yield citric acid
  • There are three points in the cycle where NAD+ is reduced to NADH+H+
The flow chart given below shows the steps in glycolysis. Select the option that correctly fills in the missing steps A, B, C, and D.


886638_9a1616dba2e5499282c7e6f19e48c4d0.png
  • A-Fructose-6-phosphate; B-Fructose-1,6-biphosphate; C- 3-PGAL; D-1,3-biphosphoglyceric acid 
  • A- Fructose -1,6-biphosphate ; B- 3-PGAL ; C- 1,3-biphosphoglyceric acid ; D-3 PGAL
  • A- 3PGAL ; B-1,3 biophosphoglyceric acid ; C-3PGAL ; D- Frutose-1,6-biphosphate
  • A- Fructose -1,6-biophosphate ; B-Fructose -6- phosphate ; C-PGAL ; D-1,3- biphosphoglyceric acid
Which of the given enzyme is not concerned with the irreversible reaction of glycolytic pathway?
  • Phosphofructo kinase
  • Hexokinase
  • Triose phosphate mutase
  • Pyruvate kinase
The three boxes in this diagram represent the three major biosynthetic pathways in aerobic respiration. Arrows represent net reactants or products.


Arrows numbered 4, 8and 12 can all be


875591_31a6b031788c4bf1999a82410ee278ad.png
  • H2O
  • FAD or FADH2
  • NADH
  • ATP
Study the given steps of glycolysis and identify the enzymes (i), (ii), and (iii) responsible for carrying out these steps.

886637_d55de046031142298ac63a9b6326e10d.png
  • Phosphohexose - (i), Phosphofructokinase - (ii), Aldolase - (iii)
  • Hexokinase - (i), Phosphofructokinase - (ii), Aldolase - (iii)
  • Phosphohexose - (i), Hexokinase - (ii), Phosphofructokinase - (iii)
  • Aldolase - (i), Phosphofructokinase - (ii), Phosphohexose isomerase - (iii)
Select the correct option:
Identify A,B and C in the given reaction of lactic acid fermentation and select the correct option.
Pyruvicacid+ALactatedehydrogenaseFMN,Zn2+B+C
  • A-NADH ; B- Lactic acid + CO2 ; C- NAD+
  • A-NADH ; B- Lactic acid  ; C- NAD+
  • A-NAD+; B- Lactic acid ; C- NADH
  • A-NAD+; B-Lactic acid + CO2; C-NADH
The end product of glycolysis is _____________.
  • Pyruvic acid
  • Glucose
  • Ethyl alcohol
  • CO2
Which is true about the end products of glycolysis?
  • 2pyruvicacid+2ATP+2NADH2
  • 2pyruvicacid+2NADH2
  • 1pyruvicacid+2ATP+2NADH2
  • 2pyruvicacid+1ATP+1NADH2
Which of the following steps during glycolysis is associated with utilization of ATP?
  • Glucose Glucose-6-phosphate
  • Fructose-6-phosphate Fructose-1,6-bisphosphate
  • PEP Pyruvic acid
  • Both (a) and (b)
At the end of glycolysis, X is the net energy gain from one molecule of glucose via Y, but there is also energy stored in the form of Z. identify X, Y, and Z.
  • X- 1 ATP ; Y-Oxidative phosphorylation ; Z - NADH+H+
  • X- 2 ATP ; Y-Oxidative phosphorylation ; Z - NADH+H+
  • X- 1ATP ; Y-Substrate level  phosphorylation ; Z - FADH2
  • X- 2ATP ; Y-Substrate level  phosphorylation ; Z - NADH+H+
A test tube containing molasses solution and yeast is kept in a warm place overnight. The gas collected from this mixture
  • Extinguishes the flame
  • Bursts into flame when ignited
  • Turns lime water milky
  • Both (a) and (c)
Ethyl alcohol fermentation occurs in _______________.
  • Lactobacillus
  • Muscles of Humans
  • Rhizopus
  • All of these
Select the correct option:
What does A,B and C depict in the given pathways of anaerobic respiration?


887583_4199a3a8ce6d44eeaf6f57937b05c9fa.png
  • A-NADH+H+NAD+; B- NAD+NADH+H+; C-NAD+NADH+H+
  • A-NADH+H+NAD+; B-NADH+H+NAD+; C-NAD+NADH+H+
  • A-NAD+NADH+H+; B-NADH+H+NAD+; C- NADH+H+NAD+
  • A-NAD++H+; B-NADH+H+NAD+; C- NAD+NADH+H+
Which of these steps in krebs' cycle indicates substrate level phosphorylation?
  • Conversion of succunic acid to a-ketoglutaric acid
  • Conversion of succunic acid to malic acid
  • Conversion of succunyl CoA to succunic acid
  • Conversion of malic acid to oxaloacetic acid
During alcoholic fermentation by yeast two molecules of glucose produce.
  • 2 molecules of ethanol +2 molecules of CO2
  • 4 molecules of ethanol +4 molecules of CO2
  • 6 molecules of ethanol +6 molecules of CO2
  • 3 molecules of ethanol +3 molecules of CO2
Value of R.Q. in succulents is ____________.
  • Unity
  • Infinite
  • Less than unity
  • Zero
The net gain of ATP molecules in glycolysis during aerobic respiration is
  • 0
  • 2
  • 4
  • 8
Select the correct option:
Identify X,Y and Z in the given diagram of Citric acid cycle and select the correct option.

887746_4d3adbc2e55043eca2adeb6fd8901035.jpg
  • X-GTP; Y-NADH2;Z-FADH2
  • X-FADH2; Y- NADH2; Z-GTP
  • X-NADH2; Y-FADH2 ; Z- GTP
  • X-CO2 ; Y- NADH2 ; Z-ADP
Select the correct option:Fermentation is represented by the equation
  • C6H12O6+6O26CO2+6H2O+686Kcal
  • C6H12O62C2H5OH+2CO2+59Kcal
  • 6CO2+12H2OLightChlorophyllC6H12O6+6H2O+6O2
  • 6CO2+6H2OC6H12O6+6O2
Read the given statements and select the correct option.

Statement 1: Glycolysis occurs in mitochondrial matrix.

Statement 2: Kerbs' cycle occurs on cristae of mitochondria.
  • Both statements 1 and 2 are correct
  • Statement 1 is correct but statement 2 incorrect.
  • Statement 1 is incorrect but statement 2 correct.
  • Both statements 1 and 2 are incorrect
Acetyl CoA is produced from pyruvate by
  • oxidative decarboxylation
  • oxidative photophosphorylation
  • oxidative hydrogenation
  • oxidative photorespiration.
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