CBSE Questions for Class 11 Medical Biology Respiration In Plants Quiz 14 - MCQExams.com

The fate of pyruvic acid during aerobic respiration is
  • Lactic acid fermentation
  • Alcoholic fermentation
  • Oxidative decarboxylation
  • Oxidative phosphorylation
Krebs' cycle is also called metabolic sink as it is a common pathway for
  • Carbohydrates, fats and proteins (amino acids)
  • Carbohydrates and fats only
  • Carbohydrates and organic acids only
  • Proteins and fats only
Which of the following is a 4-carbon compound?
  • Oxaloacetic acid
  • Phosphoglyceric acid
  • Ribulose bisphosphate
  • Phosphoenol pyruvate
Pyruvate dehydrogenase is used in converting
  • Glucose to Pyruvate
  • Pyruvic acid to Lactic acid
  • Pyruvate to Acetyl CoA
  • Pyruvate to Glucose
Which step is called a gateway step/link reaction in aerobic respiration?
  • Glycolysis
  • Formation of acetyl coenzyme A
  • Citric acid formation
  • ETS terminal oxidation
Site of Krebs' cycle in mitochondria is
  • Outer membrane
  • Matrix
  • Oxysomes
  • Inner membrane
The first 5C dicarboxylic acid in Krebs' cycle which is used in nitrogen metabolism is
  • OAA
  • Citric acid
  • $$\alpha$$-ketoglutaric acid
  • Acetyl coenzyme A
Categories the given equations under respective phases and select the correct option.

887760_5b42146c7e2f45e5937c4091e078bf91.jpg
  • I-Glycolysis ; II-Fermentation  ; III-Krebs' cycle
  • I-Krebs' cycle ; II - Fermentation ; III -Glycolysis
  • I-Krebs' cycle ;II- Glycolysis ; III- Fermentation
  • I- Glycolysis ; II- Krebs' cycle ; III-Fermentation
Substrate level phosphorylation occurs during which step of Krebs' cycle?
  • $$Succinyl \,CoA\rightarrow Succinic \,acid$$
  • $$Isocitric \,acid\rightarrow Oxalosuccinic \,acid$$
  • $$Oxalosuccinic \,acid\rightarrow\alpha-ketoglutaric \,acid$$
  • $$Malic \,acid\rightarrow OAA$$
Refer the given figure showing citric acid cycle. What changes take place during the conversion of A to B?
888461_230a34eb5de342659246b3c9d08a78d9.jpg
  • $$CO_2$$ is liberated
  • $$NAD^+$$ is converted to $$NADH$$ + $$H^+$$
  • GTP is formed from GDP
  • All of these
Which of the following steps of respiration is amphibolic?
  • Glycolysis
  • Oxidative decarboxylation of pyruvate
  • TCA cycle
  • Oxidative phosphorylation
The intermediate product between $$\alpha$$-ketoglutaric acid and succinic acid in TCA cycle is
  • Acetyl CoA
  • Succinyl CoA
  • Fumarate
  • Oxalosuccinic acid
Select the correct statement -
  • When ATP is synthesised directly from metabolites, it is substrate level phosphorylation.
  • In Krebs' cycle, citrate undergoes 2 decarboxylations and 4 dehydrogenations.
  • Krebs' cycle is an amphibolic process
  • All of these
All enzymes of TCA cycle are located in the mitochondrial matrix except one which is located in inner-mitochondrial membranes in eukaryotes and in cytosol in prokaryotes. This enzyme is
  • Isocitrate dehydrongenase
  • Ketoglutarate dehydrogenase
  • Succinate dehydrogenase
  • Lactate dehydrogenase
Respiratory quotient is defined as
  • $$O_2$$ evolved / $$CO_2$$ absorbed
  • $$CO_2$$ evolved / $$O_2$$ absorbed
  • $$CO_2$$ evolved
  • $$CO_2$$ absorbed/ $$O_2$$ evolved.
Select the correct option:
Select the correct sequence of formation of given intermediates of Krebs' cycle.
  • $$Succinate\rightarrow Malate\rightarrow Fumarate\rightarrow OAA$$
  • $$Fumarate\rightarrow Succinate\rightarrow Malate\rightarrow OAA$$
  • $$Succinate\rightarrow Fumarate\rightarrow Malate\rightarrow OAA$$
  • $$Malate\rightarrow Fumarate\rightarrow Succinate\rightarrow OAA$$
Select the wrong statement -
  • When tripalmitin is used as a substrate in respiration, the RQ is 0.7.
  • The intermediate compound which links glycolysis with Krebs' cycle is malic acid
  • One glucose molecule yields a net gain of 36 ATP molecules during aerobic respiration.
  • One glucose molecule yields a net gain of 2 ATP molecules during glycolysis.
If volume of $${CO}_{2}$$ liberated during respiration is more than the volume of $${O}_{2}$$ used, then the respiratory substrate will be
  • Carbohydrate
  • Fat
  • Protein
  • Organic acid
Select the correct option:
Refer to the following flow chart representing the cellular respiration and its fuels. Blanks 1,2,3,4,5,6 and 7 are respectively

888978_ebb512bc996d498f94ba2a0defe5274a.jpg
  • amino acids, carbohydrate, glucose, fats, glycerol, fatty acid, acetyl Co-A.
  • fats, acetyl Co-A, amino acid, fatty acid, carbohydrate, glycerol, glucose.
  • fatty acid, glucose, acetyl Co-A, glycerol, fats carbohydrate, amino acid.
  • carbohydrate, fats, glycerol, fatty acids, amino acid, glucose, acetyl Co-A.
Refer to the given figure and select the correct option for A,B,C and D.

888907_937051e39a994425838f26af3336ea0e.jpg
  • A-Fats ; B- Proteins;C-3-PGAL ; D- AcetylCoA
  • A-Fats ; B- Proteins;C-3-PGAL ;D-$$CO_2$$
  • A-Proteins ; B- Fats ; C- Acetyl CoA ; D- PEP
  • A-Proteins ; B- Fats ; C - PEP ;D - Acetyl CoA
Match column I with column II and select the correct option from the codes given below.
Column I Column II 
A. Krebs' cycle(i) Inspiration
B. Lungs
(ii) Hamburger's phenomenon 
C. Diaphragm(iii) Diffusion of $$CI^{-}$$ into RBCs
D. Pons varolii(iv) Mitochondria 
 E. Chloride shift (v) Crural and costal
 (vi) Pneumotaxic centre
 (vii) Expiration
  • A-(iv), B-(i), (vii), C-(v), D-(vi), E-(ii), (iii)
  • A-(v), B-(i), C-(iv), (vii), D-(vi), E-(ii), (iii)
  • A-(ii), (vi), B-(i), C-(iii), D-(v), (vii), E-(iv)
  • A-(iii), B-(i), C-(ii), (v), D-(vi), (vii), E-(iv)
Which of the following options contains the end products formed during anaerobic respiration in Yeast?
  • $$H_2O, CO_2$$ and energy
  • $$H_2S, C_6H_{12}O_6$$ and energy
  • $$CO_2, C_2H_5OH$$ and energy
  • $$H_2O$$ and $$CO_2$$
In some biochemical reaction, two redox equivalents in the form of hydrogen atoms come out from PGAL and transferred to NAD$$^+$$, site of this process is
  • Stroma of chloroplast
  • Cytoplasm
  • Mitochondrial matrix
  • Outer membrane of mitochondria
When the Respiratory Quotient (R.Q.) is greater than 1, it indicates
  • Only aerobic respiration is taking place
  • Only anaerobic respiration is taking place
  • Both aerobic and anaerobic respiration are taking place
  • None of these
Before entering the TCA cycle, pyruvic acid converted into acetyl CoA. This process is known as
  • Oxidative carboxylation
  • Oxidative dehydration
  • Oxidative decarboxylation
  • Reductive phosphorylation
A Krebs cycle intermediate, which act as a raw material for chlorophyll production is synthesized after
  • Condensation
  • Substrate level phosphorylation
  • Hydration
  • Dehydrogenation
Respiratory quotient may be represented as
  • $$O_2$$ taken in $$/ CO_2$$ evolved
  • $$CO_2$$ evolved $$/O_2$$ taken in
  • $$O_2$$ taken in $$/H_2O$$ evolved
  • $$CO_2$$ taken in $$H_2O$$ evolved
By the aerobic respiration of one molecule of glucose, how many $$CO_2$$ molecules produced in the mitochondria but outside the TCA cycle?
  • $$2$$
  • $$4$$
  • $$6$$
  • $$12$$
How many ATP are formed when 2 molecules of NADH + H+ formed in glycolysis enter the ETS via malate aspartate shuttle?
  • Two
  • Four
  • Six
  • Eight
Match the number of carbon atoms given in column I with that of the compounds given in column II and select the correct option 
Column I
Column II
A$$4 C$$ compound1Acetyl Co-A
B$$2 C$$ compound2Pyruvate
C$$5 C$$ compound3Citric acid
D$$3 C$$ compound4$$\alpha - $$ ketoglutaic acid


5Malic acid
  • A-2, B-5, C-3, D-1
  • A-3, B-1, C-4, D-2
  • A-5, B-1, C-4, D-2
  • A-5, B-3, C-1, D-2
Acetyl CoA connects
  • EMP and Glycolysis
  • Calvin cycle and EMP
  • Glycolysis and Krebs cycle
  • Krebs cycle and ETS
Which one among the following is oxidative step of glycolysis?
  • Phosphoglycerate $$\rightarrow$$ phosphoenol pyruvate
  • Glyceraldehyde $$3-$$ phosphate $$\rightarrow$$ $$1, 3-$$bis Phosphoglycerate
  • Phospho enol pyruvate $$\rightarrow$$ pyruvate
  • Fructose $$1,6-$$ bis phosphate $$\rightarrow$$ Triose phosphate
Number of oxygen atoms required for aerobic oxidation of pyruvate
  • $$5$$
  • $$8$$
  • $$10$$
  • $$12$$
The number of ATP  produced when one molecule of pyruvic acid is used as respiratory substrate in Kreb's cycle?
  • $$15$$
  • $$12$$
  • $$3$$
  • $$36$$
Metabolic fate of pyruvic acid depend on
  • Cellular energy
  • Availability of oxygen
  • Type of respiration
  • All of the above
What could be the reason for maida flour to increase in size?
  • Fermentation
  • Preservation
  • Fumigation
  • Both A and B
Pacemaker enzyme of EMP pathway is
  • Hexokinase
  • Pyruvate kinase
  • Enolase
  • Phosphofructokinase
Rearrange the sequential order as formed during the breakdown of glucose into pyruvate.
Glucose 6-phosphate, Fructose 6-phosphate, PGA, Pyruvate
  • Glucose 6 phosphate $$\rightarrow$$ Fructose 6 phosphate $$\rightarrow$$ PGA $$\rightarrow$$ Pyruvate
  • Pyruvate $$\rightarrow$$ Glucose 6 phosphate $$\rightarrow$$ Fructose 6 phosphate $$\rightarrow$$ PGA
  • Pyruvate $$\rightarrow$$ Fructose 6 phosphate $$\rightarrow$$ Glucose 6 phosphate $$\rightarrow$$ PGA
  • Glucose 6 phosphate $$\rightarrow$$ PGA $$\rightarrow$$ Fructose 6 phosphate $$\rightarrow$$ Pyruvate
In how many steps, glycolysis can be regulated?
  • One
  • Two
  • Three
  • Four
How many molecules of ATP are require in glycolysis to change one molecule of glucose to pyruvic acid?
  • 1
  • 4
  • 2
  • 3
In aerobic respiration the Kreb's cycle occurs inside the
  • Chloroplast
  • Cytoplasm
  • Mitochondria
  • Ribosome
In anaerobic respiration of yeast
  • $${ O }_{ 2 }$$ is given out
  • $${ CO }_{ 2 }$$ is given out
  • $${ CO }_{ 2 }$$ is taken in
  • $${ O }_{ 2 }$$ is taken in
How many total dehydrogenetaion occur in citric acid cycle :-
  • One
  • Two
  • Three
  • Four
Which one is not correct with given marks?
1083241_80d79206e30b4c2ba8fb5192df5207f5.PNG
  • B-carboxylation- fixation of $$CO_2$$ the aldose sugar
  • C- reduction - reverse of glycolysis
  • A- regeneration - reformation of pentose sugar
  • C- reduction - carbohydrate formation
At how many step there occurs substrate level phosphorylation in glycolysis?
  • One
  • Two
  • Three
  • Four
Which of the following statements regarding pyruvate during aerobic respiration is incorrect?
  • It is formed by the glycolytic catabolism of carbohydrates in the mitochondrial matrix.
  • It enters mitochondrial matrix and undergoes oxidative decarboxylation.
  • The conversation of pyruvic acid to acetyl CoA is catalyzed by pyruvic dehydrogenase.
  • Two molecules of NADH are produced from the metabolism of one glucose into two molecules of pyruvic acid.
What is fermentation?
  • Storing of sugar
  • Breaking of sugar
  • Streaming of sugar
  • Boiling of sugar
Compensation point is the value of the factor where there is
  • Neither photosynthesis nor respiration
  • Little photosynthesis
  • Photosynthesis is equal to the rate of respiration
  • Beginning of photosynthesis
The respiratory quotient during cellular respiration would depend upon
  • Amount of $$CO_{2}$$ released
  • Amount of $$O_{2}$$ utilized
  • The nature of enzyme in invoked
  • Nature of substrate
  • Both (a) and (b)
Connecting link between respiration (TCA cycle) and protein synthesis is 
  • Citric acid
  • $$\alpha$$- ketoglutaric acid
  • Succinic acid
  • Fumaric acid
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