CBSE Questions for Class 11 Medical Biology Respiration In Plants Quiz 16 - MCQExams.com

Select a suitable name for this process:
$$C_6H_{12}O_6$$ + 2ADP + 2pi $$\rightarrow$$ 2$$C_2H_{5}OH$$ + 2ATP + $$CO_2$$ $$\uparrow$$
  • Alcoholic fermentation
  • Photorespiration
  • Lactate fermentation
  • Aerobic respiration
In Sedum, the R.Q at night is 
  • Unity
  • More than unity
  • Less than unity
  • Zero
In which type of reaction related to plant photosynthesis, peroxisomes are involved?
  • Glycolate cycle
  • Calvin cycle
  • Bacterial photosynthesis
  • Glyoxylate cycle
Which type of reaction changes pyruvate to acetyl CoA?
  • Oxidative decarboxylation
  • Oxidative dehydrogenation
  • Oxidative dehydration
  • Oxidative phosphorylation
Oxidation of succinic acid to fumaric acid is accompanied by reduction of 
  • FAD
  • NAD
  • FMN
  • NADP
The scientific name of cellobiose is 
  • $${4-O-\beta -D}$$- glucopyranosyl-D-glucose.
  • $${8-O-\beta -D}$$- glucopyranosyl-D-glucose.
  • $${4NH_2SO_4-\beta -D}$$-reductase.
  • $${6NH_3PO_4-\alpha -D}$$-reductase.
Net yield of aerobic respiration per glucose molecule is
  • 2 ATP molecules
  • 8 ATP molecules
  • 36 ATP molecules
  • 38 ATP molecules
Krebs cycle was discovered by Krebs in pigeon muscles inWhich step is called gateway step / link reaction / transition reaction in respiration?
  • Glycolysis
  • Formation of acetyl-coA
  • Citric acid formation
  • ETS 
 List I  List II
 A Hexokinase 1 Conversion of fructose-6-phosphate to fructose-1-6-diphosphate
 B Triose phosphate dehydrogenase 2 Conversion of glucose to glucose-6-phospahte
 C Phosphoglyceromutase 3 Conversion of 1, 3-diphosphoglyceraldehyde to 1, 3-diphosphoglyceric acid
 D Phosphofructokinase 4 Conversion of 3-phosphoglyceric acid to 2-phosphoglyceric acid
Match the above lists and choose the correct option.
  • A - 2, B - 3, C - 4, D - 1
  • A - 3, B - 2, C - 4, D - 1
  • A - 2, B - 4, C - 3, D - 1
  • A - 2, B - 3, C - 1, D - 4
Which of the following is true for Krebs cycle?
  • Isocitrate$$\rightarrow$$ Fumrate$$\rightarrow$$ $${\alpha }$$ ketoglutarate
  • $${\alpha }$$ Ketoglutarate$$\rightarrow$$ Oxalosuccinate$$\rightarrow$$ Isocitrate
  • Oxalosuccinate$$\rightarrow$$ Isocitrate$$\rightarrow$$ $${\alpha }$$ ketoglutarate
  • Isocitrate$$\rightarrow$$ $${\alpha }$$ ketoglutarate$$\rightarrow$$ Succinate
In glycolysis, the rate limiting enzyme is 
  • Glucokinase
  • Phosphofructokinase
  • Phosphohexose isomerase
  • Aldolase
Pyruvate formed during glycolysis moves from
  • Cristae of mitochondria to matrix
  • Cytoplasm to matrix of mitochondria
  • Matrix to cytoplasm
  • Mitochondrial membrane to cytoplasm
If R.Q. is $$0.6$$ in a respiratory metabolism, it would mean that
  • Carbohydrates are used as respiratory substrate
  • Organic acids are used as respiratory substrate
  • The oxidation of the respiratory substrate consumed more oxygen than the amount of $${CO_2}$$ released
  • All of the above
R.Q. in anaerobic respiration is 
  • 0
  • $${\propto }$$
  • 1
  • > 1
Decline in the activity of the enzyme hexokinase by Glucose-6-phosphate is caused by
  • Non-competitive
  • Competitive modulators
  • Allosteric modulators
  • Denaturation of enzymes
  • Increased by substrate concentration
In a germinating seed, when protein is aerobically oxidized, the R.Q. value will be
  • Less than one
  • More than one
  • Zero
  • One
The wrong statement amongst the following is 
  • The phenomenon of inhibition of glycolosis by $$ {O_2}$$ is a Pasteur effect.
  • TCA is amphibolic in nature.
  • HMP is an alternate pathway to glycolysis.
  • Anaerobic oxidative reactions (glycolysis) may be increased by aeration.
In TCA cycle, when succinate is converted to fumarate
  • Hydrogen is liberated.
  • Oxygen is added.
  • Proton is removed.
  • Electron is added.
Choose the correct combination of labeling the number of carbon compounds in the substrate molecules, involved in the citric acid cycle.

160136.png
  • A - 4C, B - 6C, C - 5C, D - 4C, E - 4C
  • A - 6C, B - 5C, C - 4C, D - 3C, E - 2C
  • A - 2C, B - 3C, C - 4C, D - 5C, E - 6C
  • A - 4C, B - 5C, C - 6C, D - 4C, E - 4C
  • A - 4C, B - 6C, C - 4C, D - 4C, E - 4C
Which of these steps in Krebs cycle indicates substrate level phosphorylation? Conversion of 
  • Succinic acid to $${\alpha }$$-ketoglutaric acid
  • Succinic acid to malic acid
  • Succinyl CoA to succinic acid
  • malic acid to oxaloacetic acid
  • Citric acid to $${\alpha }$$-ketoglutaric acid
How many ATP molecules are formed in ETS from the reduced nicotinamide adenine dinucleotide generated in two rounds of Krebs cycle?
  • 3
  • 6
  • 9
  • 18
Mineral activator for enzyme carboxylase in TCA cycle is Fe.
  • True
  • False
Number of oxygen molecules required for aerobic oxidation of one pyruvate is
  • 6
  • 8
  • 10
  • 12
How many times $$CO_2$$ is released in aerobic respiration?
  • One 
  • Three
  • Six
  • Twelve
The respiratory quotient (R.Q) of some of the compounds are 4, 1 and 0.These compounds are identified respectively as 
  • Malic acid, palmitic acid and tripalmitin
  • Oxalic acid, carbohydrate and tripalmitin
  • Tripalmitin, malic acid and carbohydrate
  • Palmitic acid, carbohydrate and oxalic acid
  • Oxalic acid, carbohydrate and malic acid
If all the lenticels of stem are blocked, the first to die will be
  • Leaves
  • Shoot tips
  • Roots
  • None of the above
Enzyme cytochrome oxidase can be inhibited by
  • Iodo acetate
  • Azides and cyanides
  • Oligomycins
  • Dinitrophenol
In the Krebs cycle, the FAD electron transport system operates during the conversion of 
  • Succinyl CoA to succinic acid
  • $${\alpha} $$-ketoglutarate to succinyl CoA
  • Succinic acid to fumaric acid
  • Fumaric acid to malic acid
Number of ATP produced during EMP pathway is 
  • 24 ATP molecules
  • 8 ATP molecules
  • 38 ATP molecules
  • 15 ATP molecules
Select the wrong statement(s) about respiration.
a) It consists of breathing, oxidation of food and energy storage in the form of ATP.
b) Cytoplasm and mitochondria are necessary for the completion of aerobic respiration.
c) Complete oxidation of food into ethanol or lactic acids, $$CO_2$$ and few molecules of ATP are seen in anaerobic respiration.
d) In the older portions of woody plants, the gaseous exchange takes place through stomatal apertures.
Statements that are entirely wrong are
  • a) and b)
  • b) and c)
  • a) and d)
  • c) and d)
The inhibitory effect of the presence of $$O_2$$ on anaerobic respiration is termed as
  • Warburg effect
  • Pasteur effect
  • Emerson's effect
  • Oxygen effect
Consider the following two equations A and B.
Equation A
Glucose $$\rightarrow$$ Pyruvate $$\rightarrow\, CO_2\, +\, H_2O\, +$$ Energy
Equation B
Glucose $$\rightarrow$$ Pyruvate $$\rightarrow\, C_2H_5OH\, +\, CO_2\, +$$ Energy
Which one of the following is correct with respect to both the equations A and B?
  • A is aerobic respiration consisting of glycolysis and Krebs cycle, B is anaerobic fermentation reaction.
  • A is anaerobic respiration and B is aerobic fermentation reaction.
  • A is aerobic respiration B is anaerobic lactic acid fermentation.
  • In both A and B reactions, pyruvate undergoes complete oxidation.
Which 5-carbon organic acid of TCA cycle is key compound in a N$$_2$$ metabolism?
  • Citric acid
  • Fumaric acid
  • Isocitrate
  • $$\alpha$$-ketoglutaric acid
What is the maximum number of ATP molecules that could be generated from one molecule of glucose, if the complete oxidation of one mole of glucose to $$CO_2$$ and $$H_2O$$ yields 686 kcal and the useful chemical energy available in the high energy phosphate bond of one mole of ATP is 12 Kcal?
  • 57
  • 1
  • 2
  • 30
Enzymes of TCA cycle are located in the mitochondrial matrix except one which is located in inner mitochondrial membrane in eukaryotes and in cytosol in prokaryotes. This enzyme is 
  • Succinate dehydrogenase
  • Lactate dehydrogenase
  • Isocitrate dehydrogenase
  • Malate dehydrogenase
In which of the following steps of Krebs cycle, $$CO_{2}$$ is evolved?
  • Isocitric acid $$\rightarrow$$ oxalosuccinic acid
  • Oxalosuccinic acid $$\rightarrow$$ $$\alpha$$-ketoglutaric acid
  • Succinic acid $$\rightarrow$$ fumaric acid
  • Malic acid $$\rightarrow$$ oxaloacetic acid
What is active glucose?
  • FAD glucose
  • NAD glucose
  • Glucose-6-Phosphate
  • Glycerophosphate
Given below are some reactions and the enzymes involved.
Identify the correct pairs.
Column IColumn II
$$Fructose 1, 6 diphosphate \rightarrow 3 PGAL + DHAP$$a. Enolase
$$Citrate \rightarrow Cis - aconitate$$b. Thiokinase
$$Succinyl\ Co. A\rightarrow succinate$$c. Aconitase
$$2 PGA \rightarrow PEPA$$d. Aldolase
  • $$1 - d, 2 - c, 3 - b, 4 - a$$
  • $$1 - a, 2 - b, 3 - c, 4 - d$$
  • $$1 - b, 2 - a, 3 - d, 4 - c$$
  • $$1 - c, 2 - d, 3 - a, 4 - b$$
Identify the sequence of steps involved during inspiration in rabbit.
(A) Volume of thoracic cavity increases
(B) Contraction of external intercostal muscles moves the rib cage forward
(C) Diaphragm becomes flat
(D) Thoracic cavity expands drawing air into lungs.
  • (C)$$\rightarrow$$(B)$$\rightarrow$$ (A)$$\rightarrow$$(D)
  • (C)$$\rightarrow$$(A)$$\rightarrow$$ (B)$$\rightarrow$$ (D)
  • (A)$$\rightarrow$$(B)$$\rightarrow $$(C)$$\rightarrow$$ (D)
  • (A)$$\rightarrow$$(D)$$\rightarrow$$ (B) $$\rightarrow$$ (C)
Match the compounds given in Column I with the number of carbon atoms present in them which are listed under Column II. Choose the answer which gives the correct combination of alphabets of the  two columns.
Column I
Column II
A. Oxaloacetate
(p) 6- C compound
B. Phosphoglyceraldehyde
(q) 5- C compound
C. Isocitrate
(r) 4- C compound
D. a-Ketoglutarate
(s) 3- C compound

(t) 2- C compound
  • A- s, B- t, C- q, D- r
  • A- r, B- s, C- p, D- q
  • A- r, B- t, C- p, D- q
  • A- q, B- s, C- p, D- t
The time taken from the fixation of $$CO_{2}$$ to the formation of one glucose molecule is about __________ seconds.
  • $$20$$
  • $$40$$
  • $$60$$
  • $$90$$
A student has taken 6000 molecules of fructose 1, 6-bisphosphate and 2 molecules of aldolase into an enzyme reaction mixture to determine its activity. After 5 minutes, 50% substrate was found converted into products. Then, what is the TON of aldolase and the total number of trioses formed by the enzyme action at the end of 5 minutes?
  • 300, 3000
  • 300, 6000
  • 600, 3000
  • 30, 6000
Net yield of aerobic respiration during Krebs cycle per glucose molecule is
  • 2 ATP molecules
  • 8 ATP molecules
  • 36 ATP molecules
  • 38 ATP molecules
The respiratory quotient during cellular respiration would depend on
  • The nature of enzymes involved.
  • The nature of the substrate.
  • The amount of carbondioxide released.
  • The amount of oxygen utilized.
A scientist took 8 molecules of cytosoic aldolase into an enzyme reaction mixture to study its activity. After ten minutes of enzyme reaction, 60% of its substrate was found converted into 2400 molecules of products. Then what is the TON of aldolase and number of substrate molecules left over in the reaction mixture?
  • $$30, 1440$$
  • $$30, 960$$
  • $$15, 1280$$
  • $$15, 800$$
The puffed-up appearance of dough is due to fermentation by yeast. Identify the gas liberated during the process
  • Methane
  • Carbon dioxide
  • Hydrogen sulphide
  • Ammonia
The last stage of cellular respiration which yields ATP by the oxidation of organic molecules, derived from glucose is
  • Chemiosmosis.
  • Citric acid cycle.
  • Electron transport chain.
  • Glycolysis.
  • Oxidation phosphorylation.
In which of the following reactions of glycolysis, a molecule of water is removed from the substrate?
  • Glucose $$\rightarrow$$ Glucose-6-phosphate
  • Fructose-6-phosphate $$\rightarrow$$ Fructose-1,6 bisphosphate
  • 2-phosphoglycerate $$\rightarrow$$ Phosphoenol pyruvate
  • Phosphoenol pyruvate $$\rightarrow$$ Pyruvate
The given figure illustrates the conversion of glucose into ethanol, a key process of anaerobic energy transformation in some organisms.

The best explanation for this is that
526890_f9ddac17453d4a04b036f6d70dc65c65.png
  • Step 1 illustrates that ATP hydrolysis is an energetically favorable exergonic reaction that couples the free energy released when ATP forms ADP and Pi (inorganic phosphate) with the endergonic conversion of glucose into pyruvate.
  • NADH is oxidized during step 1 and reduced during step 3.
  • Step 1 illustrates the phosphorylation of ADP into ATP, which is coupled to the energetically favorable conversion of glucose into pyruvate.
  • In step 1 ATP is oxidized and glucose is reduced, and it is this coupling that provides the energy to drive ethanol production.
Which of the following process produces ATP, NADH and $$FADH_2$$ from pyruvate?
  • Krebs Cycle
  • Electron Transport Chain
  • Fermentation
  • Glycolysis
  • Calvin cycle
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 11 Medical Biology Quiz Questions and Answers