Respiration in Plants Test

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Respiration in Plants Test - 90

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Weekly Quiz Competition

Question 1

1 / -0

Match List I with List II and select the correct answer.

List-I (Enzyme)	List-II( Conversions)
a. Phosphogluco isomerase	$$1$$. Fructose$$\rightarrow$$ Glucose
b. Triose phosphate isomerase	$$2$$. Glucose$$\rightarrow$$ Glucose-$$6$$-Phosphate
c. Fructose diphosphate aldolase	$$3$$. Glucose-$$6$$-phosphate$$\rightarrow$$Fructose-$$6$$-phosphate
d. Hexokinase	$$4$$. Glyceraldehydes-$$3$$-phosphate$$\rightarrow$$ Dihydroxy acetone phosphate
	$$5$$. Fructose-$$1$$, $$6$$-diphosphate$$\rightarrow$$ Glyceraldehydes-$$3$$-phosphate

A-$$5$$, B-$$4$$, C-$$1$$, D-$$2$$

A-$$3$$, B-$$4$$, C-$$5$$, D-$$2$$

A-$$5$$, B-$$2$$, C-$$1$$, D-$$4$$

A-$$3$$, B-$$2$$, C-$$5$$, D-$$4$$

Solution

Phosphoglucose isomerase (PGI) is a dimeric enzyme that catalyses the reversible isomerisation of glucose-6-phosphate and fructose-6-phosphate. The correct match is a - 3.
Triose-phosphate isomerase (TPI or TIM) is an enzyme that catalyzes the reversible interconversion of the triose phosphate isomers dihydroxyacetone phosphate and D-glyceraldehyde 3-phosphate. The correct match is b - 4.
Fructose-bisphosphate aldolase, often just aldolase, is an enzyme catalyzing a reversible reaction that splits the aldol, fructose 1,6-bisphosphate, into the triose phosphates dihydroxyacetone phosphate (DHAP) and glyceraldehyde 3-phosphate (G3P). The correct match is c - 5.
Hexokinase is the initial enzyme of glycolysis, catalyzing the phosphorylation of glucose by ATP to glucose-6-P. The correct match is d - 2.

So the correct answer is option B.

Question 2
1 / -0

In muscles, from three molecules of glucose, two are completely oxidized and one is incompletely oxidized (anaerobic) then, what will be the number of total $$NAD^+$$ molecules utilized?

A
20

B
10

C
14

D
08

Solution

$$NAD^+$$ is consumed only in aerobic respiration. Only two of the three glucose molecules were oxidized completely (aerobic respiration). Complete oxidation of glucose to carbon dioxide requires a total of 10 $$NAD^+$$; conversion of glucose to 2 molecules of pyruvate (Glycolysis) 2 $$NAD^+$$ are utilized. during conversion of 2 molecules of pyruvate to 2 molecules of acetylCoA, 2 molecules of $$NAD^+$$ and finally for the oxidation of each acetylCoA molecule 3 $$NAD^+$$ molecules are consumed (Kreb's cycle). Thus a total of 10 $$NAD^+$$ are consumed for the complete oxidation of 1 glucose. Thus, the correct option is A
Question 3
1 / -0

Which of the following is correct about fermentation?

A
Bread gets fermented due to formation of lactic acid.

B
Pulled up appearance of dough is due to production of $$CO_2$$

C
Fermentation in muscles produces alcohol

D
Both A and B

Solution

During the process of fermentation in the dough, the bacteria and yeast, convert carbohydrates to carbon dioxide resulting in the formation of gas bubbles. The gas bubbles expand inside the dough making it appear larger, which is called leavening.
So the correct option is 'Pulled up appearance of dough is due to production of $$CO_2$$'
Question 4
1 / -0

Which metabolite is common in respiration mediated breakdown of fats, carbohydrates and proteins ?

A
Acetyl CoA

B
Glucose 6-phosphate

C
Fructose 1, 6-biphosphate

D
Pyruvic acid

Solution

Acetyl Co-A is common in respiration mediated breakdown of fats, carbohydrates, and proteins. It is an integral part of many cellular processes. It provides carbon atom required for the citric acid cycle. It is produced via glycolysis (breakdown of carbohydrates), gluconeogenesis (breakdown of protein) and fatty acid oxidation.
Thus, the correct answer is option A.
Question 5
1 / -0

The enzymes catalysing reactions 1, 2, and 3 respectively in the above steps are

A
Phosphoglyceromutase, Enolase, Pyruvate kinase

B
Enolase, Phosphofructoknase, Pyruvate kinase

C
Phosphoglycerokinase, Enolase, Pyruvate kinase

D
G-3-P dehydrogenase, Enolase, Phosphoglyceromutase

Solution

Glycolysis is the metabolic process that involves the breakdown of one molecule glucose into two molecules of pyruvic acid to extract energy for cellular metabolism.
The steps of EMP pathway are as follows:
1) Glucose and fructose are phosphorylated to give rise to glucose-6-phosphate by the activity of the enzyme hexokinase and by utilizing ATP.
2) Conversion of glucose-6-phosphate to fructose-6-phosphate occurs due to the enzyme phosphoglucose isomerase.
3) Conversion of fructose 6-phosphate to fructose 1, 6-biphosphate occurs by the utilization of ATP molecule in the presence of phosphofructokinase.
4) Fructose 1, 6-biphosphate is split into dihydroxyacetone phosphate and glyceraldehyde-3-phosphate by aldolase enzyme.
5) When glyceraldehyde-3-phosphate gets converted into 1, 3-bisphosphoglyceric acid in the presence of glyceraldehyde-3-phosphate dehydrogenase, NAD+ reduces to NADH and H+.
6) The conversion of 1, 3-bisphosphoglyceric acid to 3-phosphoglyceric acid by phosphoglycerate kinase, is an energy-yielding process, i.e. ATP is released in this step.
7) 3-phosphoglyceric acid is converted into its isomer, 2-phosphoglyceric acid by phosphoglycerate mutase.
8) 2-phosphoglyceric acid loses a molecule of water, becoming phosphoenolpyruvate in the presence of enolase.
9) Phosphoenolpyruvate loses its phosphate group to get converted into pyruvic acid in the presence of pyruvate kinase with the release of ATP molecule.
So, the answer is A.
Question 6
1 / -0

Enzyme responsible for formation of glucose from glucose 6-phosphate is

A
Dehydrogenase

B
Aldolase

C
Kinase

D
Phosphatase

Solution

A) Dehydrogenase is an enzyme that catalyses the removal of hydrogen atoms from a particular molecule, particularly in the electron transport chain reactions of cell respiration with the help of coenzymes NAD and FAD.
B) Aldolase is an enzyme catalysing a reversible reaction that splits the aldol, fructose 1,6-bisphosphate, into the triose phosphates dihydroxyacetone phosphate (DHAP) and glyceraldehyde 3-phosphate (G3P).
C) Glucose 6-phosphate is produced by phosphorylation of glucose on the sixth carbon. This is catalysed by the enzyme kinase.
D) Phosphatase is an enzyme that uses water to cleave a phosphoric acid monoester into a phosphate ion and an alcohol.
So the correct answer is 'Kinase'.
Question 7
1 / -0

Choose the correct answers from the alternatives given :
One turn of the Krebs cycle produces

A
2 NADH, 2 $$FADH_2$$, 2 ATP

B
3 NADH, 1 $$FADH_2$$, 1 ATP

C
1 NMDH, 3 $$FADH_2$$ , 2 ATP

D
3 NADH, 2 $$FADH_2$$, 1 ATP

Solution

Krebs cycle is also called the citric acid cycle which has a series of eight reactions like oxidative decarboxylation, oxidation, hydration, rehydration etc. Each turn of the Krebs cycle produces 1 GTP ( ATP ) molecule, 3 NADH and 2 FADH$$_2$$ molecules, which is used for the process of cellular respiration to occur and produce energy.
So , correct option is ' 3 NADH , 1 FADH$$_2$$ , 1 ATP ' .
Question 8
1 / -0

How many oxidation step take place during glycolysis, link reaction and Kreb's cycle.

A
$$1, 1 and 1$$

B
$$1, 1 and 4$$

C
$$1, 1 and 3$$

D
$$1, 1 and 8$$
Question 9
1 / -0

Match the following columns.
Column I Column II
A. Molecular oxygen 1. $$\alpha$$- ketoglutaric acid
B. Electron acceptor 2. Hydrogen acceptor
C. Pyruvate dehydrogenase 3. Cytochrome-C
D. Decarboxylation 4. Acetyl Co-A

A
$$2, 3, 4, 1$$

B
$$3, 4, 2, 1$$

C
$$2, 1, 3, 4$$

D
$$4, 3, 1, 2$$

Solution

The correct matching
Molecular oxygen - Hydrogen acceptor
Electron acceptor - Cytochrome-C
Pyruvate dehydrogenase - Acetyl Co-A
Decarboxylation - $$\alpha-ketoglutaric$$ acid.
Question 10
1 / -0

During the process of aerobic respiration;
(i) gets oxidized and its electrons get transferred to the electron transport chain while in photosynthesis
(ii) get oxidized to transfer molecules to the electron transport chain.
Identify (i) and (ii).

A
(i)-glucose; (ii)-xanthophyll

B
(i)-carbon dioxide, (ii)-xanthphyll

C
(i)-carbon dioxide, (ii)-chlorophyll-a

D
(i)-glucose,(ii)-chlorophyll-a

Solution

Electron transport chains are used for extracting energy via redox reactions from sunlight in photosynthesis or, such as in the case of the oxidation of sugars, cellular respiration. In chloroplasts, light drives the conversion of water to oxygen and NADP⁺ to NADPH with transfer of H⁺ions across chloroplast membranes.
So, the correct answers are "(1)- Glucose, (2)- Chlorophyll-a."

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Column I	Column II
A. Molecular oxygen	1. $$\alpha$$- ketoglutaric acid
B. Electron acceptor	2. Hydrogen acceptor
C. Pyruvate dehydrogenase	3. Cytochrome-C
D. Decarboxylation	4. Acetyl Co-A

Respiration in Plants Test - 90

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Respiration in Plants Test - 90

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Question 1

A-$$5$$, B-$$4$$, C-$$1$$, D-$$2$$

A-$$3$$, B-$$4$$, C-$$5$$, D-$$2$$

A-$$5$$, B-$$2$$, C-$$1$$, D-$$4$$

A-$$3$$, B-$$2$$, C-$$5$$, D-$$4$$

Solution

Question 2

20

10

14

08

Solution

Question 3

Bread gets fermented due to formation of lactic acid.

Pulled up appearance of dough is due to production of $$CO_2$$

Fermentation in muscles produces alcohol

Both A and B

Solution

Question 4

Acetyl CoA

Glucose 6-phosphate

Fructose 1, 6-biphosphate

Pyruvic acid

Solution

Question 5

Phosphoglyceromutase, Enolase, Pyruvate kinase

Enolase, Phosphofructoknase, Pyruvate kinase

Phosphoglycerokinase, Enolase, Pyruvate kinase

G-3-P dehydrogenase, Enolase, Phosphoglyceromutase

Solution

Question 6

Dehydrogenase

Aldolase

Kinase

Phosphatase

Solution

Question 7

2 NADH, 2 $$FADH_2$$, 2 ATP

3 NADH, 1 $$FADH_2$$, 1 ATP

1 NMDH, 3 $$FADH_2$$ , 2 ATP

3 NADH, 2 $$FADH_2$$, 1 ATP

Solution

Question 8

$$1, 1 and 1$$

$$1, 1 and 4$$

$$1, 1 and 3$$

$$1, 1 and 8$$

Question 9

$$2, 3, 4, 1$$

$$3, 4, 2, 1$$

$$2, 1, 3, 4$$

$$4, 3, 1, 2$$

Solution

Question 10

(i)-glucose; (ii)-xanthophyll

(i)-carbon dioxide, (ii)-xanthphyll

(i)-carbon dioxide, (ii)-chlorophyll-a

(i)-glucose,(ii)-chlorophyll-a

Solution

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