CBSE Questions for Class 11 Medical Biology Respiration In Plants Quiz 7 - MCQExams.com

The value of R.Q. at the compensation point is
  • Infinity.
  • Two.
  • > 1.
  • Zero.
What causes R. Q. to vary?
  • Respiratory substrates
  • Light and $$O_2$$
  • Respiratory products
  • Temperature
The value of R.Q. for proteins is
  • Equal to one.
  • More than one.
  • Less than one.
  • Infinite.
Respiratory quotient is expressed as which of the following equations?
  • $$O_2/CO_2$$
  • $$CO_2/O_2$$
  • $$O_2/H_2O$$
  • $$CO_2 - O_2$$
$$FADH_2$$ is produced in Krebs cycle during the conversion of 
  • isocitrate
  • $$\alpha$$ - ketoglutarate
  • succinate
  • malate
The value of R.Q. for a starved cell is
  • Zero.
  • 0.8 / less than one.
  • 1 / unit.
  • Infinite.
Which of the following enzyme is not used in Krebs cycle?
  • Aconitase
  • Decarboxylase
  • Aldolase
  • Fumarase
R.Q. of an actively photosynthesizing tissue is
  • Infinity.
  • < 1.
  • > 1.
  • Zero.
Where does formation of acetyl CoA from pyruvic acid take place?
  • Mitochondria
  • Chloroplast
  • Cytoplasm
  • Golgi body
The pyruvic acid formed in glycolysis is oxidised to $$CO_{2}$$ and $$H_{2}O$$ in a cycle is called as
  • Calvin cycle.
  • Hill reaction.
  • Krebs cycle.
  • Nitrogen cycle.
The value of R.Q. of a succulent plant at night is
  • < 1.
  • > 1.
  • Zero.
  • Infinite.
Fermentation is represented by which of the following equation? 
  • $$C_{6}H_{12}O_{6}\, \rightarrow\, 6CO_{2}\, +_\, 6H_{2}O\, +\, 673 K\, cal$$
  • $$C_{6}H_{12}O_{6}\, \rightarrow\, 2C_{2}H_{5}OH\, +\, 2CO_{2}$$
  • $$6CO_{2}\, +\, 12H_{2}O\, \rightarrow\, C_{6}H_{12}O_{6}\, +\, 6H_{2}O\, +\, 6O_{2}$$
  • $$6CO_{2}\, +\, 6H_{2}O\, \xrightarrow[chlorophyll]{light}\, C_{6}H_{12}O_{6}\, +\, 6O_{2}$$
Which of the following scientist discovered the conventional path of anaerobic glycolysis?
  • Embden, Meyerhof and Parnas
  • Emerson, Hoffman and Peterson
  • Embeden, Morrison and Pitcher
  • Warburg, Dickens and Horecker
Glycolysis gives rise to
  • 8 ATP, 2 NADH$$_2$$, 2 Pyruvate.
  • 2 ATP, 2 Co-A, 2 NADH$$_2$$.
  • 2 ATP, 2 NADH$$_2$$, 2 Pyruvate.
  • 2 ATP, 2 acetate, 2 NADPH$$_2$$.
Of the following, the end product of fermentation is 
  • $$O_{2}$$.
  • $$N_{2}O$$.
  • $$H_{2}O$$.
  • $$C_{2}H_{5}OH$$.
The number of ATP molecules produced from one Krebs cycle is
  • 15
  • 30
  • 38
  • 40
The enzyme which converts glucose to glucose-6-phosphate is
  • Phosphorylase
  • Glucose phosphorylase
  • Hexokinase
  • Phosphoglucomutase
In the TCA cycle, the conversion of succinyl Co-A to succinic acid requires 
  • Acetyl Co-A + GTP + Pi.
  • Acetyl Co-A + GDP + Pi.
  • Co-A + GTP + Pi.
  • GDP + Pi.
R.Q. is more than one in the case of 
  • Fat
  • Fructose
  • Glucose
  • Organic acid
Which of the following is a 5- carbon compound of Krebs cycle?
  • Citric acid
  • Fumaric acid
  • Oxalosuccinic acid
  • $$\alpha$$-ketoglutaric acid
Product formed by the activity of malic dehydrogenase in the TCA cycle is
  • Fumaric acid.
  • Malic acid.
  • Oxaloacetic acid.
  • Succinic acid.
The end products of aerobic respiration of glucose is ______________.
  • $$CO_2\, +\, H_2O\, +\, ATP$$
  • $$CO_2$$ + pyruvic acid
  • $$CO_2$$ + ethyl alcohol
  • $$CO_2$$ + pyruvic acid + citric acid
How many ATP equivalents are produced by the oxidation of succinate into fumarate?
  • 1 ATP
  • 2 ATP
  • 3 ATP
  • 4 ATP
Total yield in one Krebs cycle is
  • $$3\, FADH_{2},\, 2\, NADH_{2},\, 1\, ATP$$.
  • $$2\, FADH_{2},\, 2\, NADH_{2},\, 2\, ATP$$.
  • $$2\, NADH_{2},\, 1\, FADH_{2},\, 2\, ATP$$.
  • $$3\, NADH_{2},\, 2\, FADH_{2},\, 2\, ATP$$.
Substrate-level ATP gain during complete oxidation of 1 molecule of glucose is
  • 8 ATP
  • 6 ATP
  • 4 ATP
  • 2 ATP
The chief enzyme found in yeast cells is ________.
  • Invertase
  • Maltase
  • Zymase
  • Amylase
How many ATP molecules are produced from the complete oxidation of a molecule of active acetate or acetyl CoA ?
  • 38 ATP
  • 15 ATP
  • 12 ATP
  • 4 ATP
How many ATP will be produced during the production of 1 molecule of acetyl CoA from 1 molecule of pyruvic acid?
  • 3 ATP
  • 5 ATP
  • 8 ATP
  • 38 ATP
Function of the enzyme aconitase in Krebs cycle is
  • Citrate $$\underrightarrow { \quad \quad Aconitase,\quad { Fe }^{ 2+ }\quad \quad  } $$ Cis aconitate
  • Cis aconitate $$\underrightarrow { \quad \quad Aconitase \quad \quad  } $$ Isocitrate
  • Both (A) and (B)
  • None of the above
Krebs cycle begins with which of the following reaction?
  • Citric acid + Acetyl CoA
  • Oxaloacetic acid + Pyruvic acid
  • Oxaloacetic acid + Citric acid
  • Oxaloacetate + Acetyl CoA
More CO$$_{2}$$ is evolved than the volume of oxygen consumed when the respiratory substrate is
  • Fat
  • Sucrose
  • Glucose
  • Organic acid
The stage up to which glycolysis and fermentation have a common pathway is
  • Dihydroxyacetone.
  • 3-phosphoglyceradehyde.
  • Pyruvate.
  • Glucose-6-phosphate.
During conversion of pyruvic acid into acetyl Co-A, the pyruvic acid is
  • Oxidised.
  • Reduced.
  • Isomerised.
  • Condensed.
Incomplete breakdown of sugars in anaerobic respiration forms
  • Glucose and $$CO_{2}$$.
  • Alcohol and $$CO_{2}$$.
  • Water and $$CO_{2}$$.
  • Fructose and water.
Significance of Krebs cycle is
  • Synthesizes ATP.
  • Carries out aerobic respiration.
  • Oxidation of glucose.
  • All of the above.
The respiratory quotient of carbohydrate is
  • Unity.
  • Greater than unity.
  • Less than unity.
  • Equal to five.
The site of TCA cycle in respiration and ATP synthesis is 
  • Mitochondrial stroma.
  • Mitochondrial matrix and oxysome.
  • Cytoplasm.
  • None of the above.
By aerobic respiration of 1 molecule of PGAL how many ATP get synthesized?
  • 8 ATP
  • 2 ATP
  • 19 ATP
  • 36 ATP
Respiratory quotient of which diet is less than unity?
  • Carbohydrate
  • Fats
  • Organic acid
  • Sugar
In the process of respiration, the largest amount of energy is produced during
  • Anaerobic respiration.
  • Krebs cycle and oxidative phosphorylation.
  • Glycolysis.
  • None of the above.
Which of the following connects glycolysis to Krebs cycle?
  • Acetyl CoA
  • Ribozyme
  • Cytochrome oxidase
  • N- acetyl glucosamine
Which of the following accepts terminal electron during aerobic respiration?
  • Molecular $$O_{2}$$
  • Molecular $$H_{2}$$
  • Molecular $$CO_{2}$$
  • $$NADPH_{2}$$
How many ATPs are directly formed during glycolysis cycle of by 6 molecule of glucose?
  • 24
  • 32
  • 36
  • 38
Which of the following is not an intermediate in Krebs cycle?
  • Acetic acid
  • Succinyl coenzyme A
  • Malic acid
  • Citric acid
The enzyme of yeast which converts glucose into ethyl alcohol is called as
  • Diastase
  • Invertase
  • Zymase
  • Maltase
Glycolysis is the conversion of
  • Glucose to glycogen.
  • Glycogen to glucose.
  • Glucose to pyruvic acid.
  • Glucose to citric acid.
Alcoholic fermentation takes place in the presence of
  • Maltase.
  • Zymase.
  • Amylase.
  • Invertase.
A respiratory cycle where $$NADH_{2}$$ is produced is the
  • Calvin cycle.
  • Krebs cycle.
  • EMP pathway.
  • HMP shunt.
Fermentation is an
  • Aerobic respiration
  • Incomplete oxidation
  • Excretory process
  • None of the above
Which of the following is true about Krebs cycle?
  • GTP / ATP is formed
  •  Decarboxylation
  • Acetyl CoA acceptor is OAA
  • All of the above
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