Respiration in Plants Test

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Respiration in Plants Test - 89

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Weekly Quiz Competition

Question 1
1 / -0

Choose the correct combination of labelling the number of carbon compounds in the substrate molecules involved in citric acid cycle

A
a - 4C, b - 6C, c - 5C, d - 4C, e - 4C

B
a - 6C, b - 5C, c - 4C, d - 3C, e - 2C

C
a - 2C, b - 3C, c - 4C, d - 5C, e - 6C

D
a - 4C, b - 5C, c - 6C, d - 4C, e - 4C

E
a - 4C, b - 6C, c - 4C, d - 4C, e - 4C

Solution

Oxaloacetic acid - C$$_4$$H$$_4$$O$$_5$$, Citric acid - C$$_6$$H$$_8$$O$$_7$$, α-Ketoglutaric acid - C$$_5$$H$$_6$$O$$_5$$, Succinic acid - C$$_4$$H$$_6$$O$$_4$$, Malic acid - C$$_4$$H$$_6$$O$$_5$$.
So the correct option is ' Oxaloacetic acid - 4 carbon, Citric acid - 6 carbon, α-Ketoglutaric acid - 5 carbon, Succinic acid - 4 carbon and Malic acid - 4 carbon.'
Question 2
1 / -0

Number of oxygen atoms required for complete oxidation of pyruvic acid is

A
6

B
12

C
3

D
8
Solution
Correct option A
Explanation for correct option:
- The complete oxidation of the pyruvic acid will occur through the formation of acetyl CoA that will enter the Kreb's cycle and the reduced products $$NADH$$ and FADH$$_{2}$$ will be oxidized in the electron transport chain.
- For the electron transport chain, oxygen will act as the final electron acceptor and 6 such oxygen atoms are required to complete the oxidation.
Question 3
1 / -0

Which of the following is the only 5-carbon compound formed during Kreb's cycle?

A
Malic acid

B
Succinic acid

C
cis-aconitic acid

D
ketoglutaric acid

Solution

In Krebs' cycle, oxalosuccinic acid thus formed from isocitric acid gets decarboxylated in presence of a decarboxylase enzyme and forms a 5 carbon ketoglutaric acid.
So, the correct answer is 'Ketoglutaric acid'.
Question 4
1 / -0

Select the correct order of reactions in glycolysis
a) 3-phosphoglyceraldehyde 1, 3-biphosphoglycerate
b) 3-phosphoglyceric acid 2-phosphoglycerate
c) BPGA 3-phosphoglyceric acid
d) Splitting of 1, 6-fructose biphosphate to dihydroxy acetone phosphate and 3-phosphoglycerladehyde

A
d, c, a, b

B
b, c, a, b

C
b, d, a, c

D
a, d, c, b

E
d, a, c, b
Question 5
1 / -0

Which one is the first compound which is common for both glucose and fructose in glycolysis?

A
Fructose 6-P

B
Glucose 6-P

C
Fructose 1, 6-biphosphate

D
Fructose 1-P

Solution

Glucose and fructose can both undergo glycolysis when required. However, in case of fructose, it enters glycolysis at a step that bypasses regulatory control of phosphofructokinase. Fructose 6-P is common to both glucose and fructose in glycolysis.
So the answer is 'Fructose 6-P'.
Question 6
1 / -0

Oxidative decarboxylation of pyruvic acid results in the formation of
I. Acetyl CoA
II. $$CO_2$$
III. ATPIV. NADH + $$H^+$$

A
I only

B
I and II only

C
I, II and III only

D
I, II and IV only

E
III and IV only

Solution

Oxidative decarboxylation of pyruvic acid occurs in the link reaction. In that, pyruvic acid is oxidised by removal of H2 and decarboxylated by removal of CO2 to produce acetyl CoA. The H2 that is released reduces NAD to NADH2.
So the answer is 'I, II and IV only'.
Question 7
1 / -0

Which enzyme converts glucose into alcohol?

A
Invertase

B
Lipase

C
Zymase

D
Diastase

Solution

Fermentation process is catalyzed by enzyme Zymase which converts sugar to ethanol and carbon dioxide.
So the correct option is 'Zymase.'
Question 8
1 / -0

In which one of the following steps of citric acid cycle, FAD is reduced to $$FADH_2$$

A
Pyruvate Acetyl CoA

B
Succinic acid Malic acid

C
Malic acid Oxalosuccinic acid

D
Citric acid -Ketoglutaric acid

E
-Ketoglutasic Succinic acid

Solution

During the process of citric acid cycle, FAD is reduced to FADH2 when succinic acid is oxidised to malic acid in presence of succinic dehydrogenase. Fumaric acid is formed as an intermediate.
So the answer is 'Succinic acid Malic acid'.
Question 9
1 / -0

During glycolysis, fructose 1, 6-biphosphate is split into

A
Dihydroxyacetone phosphate and 2-phosphoglyceraldehyde

B
Dihydroxyacetone phosphate and 1-phosphoglyceraldehyde

C
Dihydroxyacetone phosphate and 4-phosphoglyceraldehyde

D
Dihydroxyacetone phosphate and 3-phosphoglyceraldehyde

Solution

Glycolysis is the metabolic pathway that converts glucose C₆H₁₂O₆, into pyruvate it is a sequence of 10 enzyme catalyzed reactions. The second stage of glycolysis and 4th step begins with the splitting of fructose 1,6-bisphosphate into dihydroxyacetone phosphate(DHAP) and 3-phosphoglyceraldehyde(GAP) in the presence of the enzyme aldolase.
So, the correct answer is ' Dihydroxyacetone phosphate and 3-phosphoglyceraldehyde '.
Question 10
1 / -0

Citric acid cycle is .......... step in carbohydrate metabolism.

A
First

B
Second

C
Third

D
Fourth

Solution

The salivary amylase starts digesting carbohydrates and ends with monosaccharides which then into internal tissues where cell respiration begins.
The steps of carbohydrate metabolism include Glycolysis, Transfer of pyruvate to Acetyl CoA, Krebs cycle and oxidative phosphorylation.
So the correct option is 'Third.'

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Respiration in Plants Test - 89

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Respiration in Plants Test - 89

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Question 1

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

Solution

Question 2

6

12

3

8

Solution

Question 3

Malic acid

Succinic acid

cis-aconitic acid

ketoglutaric acid

Solution

Question 4

d, c, a, b

b, c, a, b

b, d, a, c

a, d, c, b

d, a, c, b

Question 5

Fructose 6-P

Glucose 6-P

Fructose 1, 6-biphosphate

Fructose 1-P

Solution

Question 6

I only

I and II only

I, II and III only

I, II and IV only

III and IV only

Solution

Question 7

Invertase

Lipase

Zymase

Diastase

Solution

Question 8

Pyruvate Acetyl CoA

Succinic acid Malic acid

Malic acid Oxalosuccinic acid

Citric acid -Ketoglutaric acid

-Ketoglutasic Succinic acid

Solution

Question 9

Dihydroxyacetone phosphate and 2-phosphoglyceraldehyde

Dihydroxyacetone phosphate and 1-phosphoglyceraldehyde

Dihydroxyacetone phosphate and 4-phosphoglyceraldehyde

Dihydroxyacetone phosphate and 3-phosphoglyceraldehyde

Solution

Question 10

First

Second

Third

Fourth

Solution

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