MCQ Questions for Class 11 Medical Biology Respiration In Plants Quiz 18

Phosphorylation of glucose during glycolysis is catalysed by

0%
Phosphoglucomutase
0%
Phosphoglucoisomerase
0%
Hexokinase
0%
Phosphorylase

Explanation

In the process of glycolysis, the first step involves the phosphorylation of glucose/fructose which results in the formation of Glucose-6-phosphate. The reaction is catalyzed by the help of enzyme hexokinase in the presence of Mg

$^+$

$^2$ ion. The reaction is:

Glucose(6C) + ATP

$\rightarrow$ Glucose-6-phosphate + ADP .

So, the correct answer to the question is 'Hexokinase'.

Select the correct statements.
(i) Between temperature range

$0-25^o$ C, rate of the respiration doubles for every

$10^o$ C rise in temperature.
(ii) Cytochromes are iron-porphyin compounds.
(ii) Respiratory rate of wounded or injures plant parts generally decreases.

0%
(i) and (ii)
0%
(ii) and (iii)
0%
(i) and (iii)
0%
(i),(ii) and (iii)

In mitochondria during aerobic respiration how many times oxidative decarboxylation takes place from one molecule of acetyl CoA?

0%
1
0%
3
0%
2
0%
4

Explanation

During aerobic respiration, when acetyl-CoA enters the Krebs cycle inside the mitochondrial matrix, it is oxidized to CO $_{2}$ while at the same time reducing NAD to NADH.

Kreb's cycle:

Isocitric is oxidized by NAD+, at the same time the NAD+ is reduced from NADH. CO $_{2}$ is released forming alpha-ketoglutarate.
CoA oxidizes alpha-ketoglutarate to produce Succinyl CoA, NAD+ is reduced to form NADH, CO $_{2}$ is released again.

So, the correct option is '3'.

Decarboxylation in glycolysis occurs at which step

0%
Glicose 6P to Fructose 6P
0%
Splitting of fructose 1,6 bis P
0%
Isomerisation of 3 phospho glycerate to 2- phospho glycerate
0%
No where

Which of the following is the first stable product of photosynthesis in maize?

0%
PGA
0%
PGAL
0%
PEPA
0%
OAA

Explanation

The photosynthetic processes of C

$_{4}$ plants are divided between mesophyll and bundle sheath cells. C-4 begins with phosphoenolpyruvate, a 3-C chemical that is converted into oxaloacetic acid ( 4-C chemical) when carbon dioxide is combined with PEP. The OAA is converted to Malic Acid and then transported from the mesophyll cell into the bundle-sheath cell.

So, the correct option is 'OAA'.

In alcohol fermentation

0%
Triose phosphate is the electron donor while acetaldehyde is the electron acceptor
0%
Triose phosphate is the electron donor while pyruvic acid is the electron acceptor
0%
There is no electron donor
0%
Oxygen is the electron acceptor

How many steps of glycolysis are irreversible?

0%
$3\quad steps\rightarrow 1st,\quad 3rd\quad and\quad last$
0%
$3\quad steps\rightarrow 1st,\quad 5th\quad and\quad last$
0%
$2\quad steps\rightarrow 1st,\quad last$
0%
1st step only

Which of the following are isomers?

0%
$3$ PGA and $2$ PGA
0%
PGAL and DHAP
0%
Glucose and Fructose
0%
All of these

The end products of fermentation are

0%
$O_2$ and ethyl alcohol
0%
$O_2$ and acetaldehyde
0%
$CO_2$ and ethyl alcohol
0%
$CO_2$ and acetaldehyde

Explanation

$\textbf{Correct Option C}$

$\textbf{Solution}$

$\bullet$ Fermentation is the process in which the glucose breakdown partially to form ethyl alcohol.

$\bullet$ Fermentation is an anaerobic process which occur without the supply of oxygen.

$\bullet$ During this process the organism converts the carbohydrate into alcohol or acid.

$\bullet$ Fermentation is basically of two types- lactic acid fermentation and alcoholic fermentation.

$\bullet$ The end product of lactic acid fermentation is lactate and the end product of alcohol fermentation is ethyl alcohol along with carbon dioxide.

$\bullet$ So the correct option is C.

Which of the following statements is not correct about oxidative decarboxylation?

0%
It takes place in mitochondrial matrix
0%
Two molecules of NADH are produced by one molecule of pyruvate
0%
Pyruvate dehydrogenase is used as catalyst in this reaction
0%
Two molecules of NADH are produced by two molecules of pyruvate

Substrate level phosphorylation occurs during which step of Kreb's cycle?

0%
Succinyl -CoA $\rightarrow$ Succinic acid
0%
Isocitric acid $\rightarrow$ Oxalosuccinic acid
0%
Oxalosuccinic acid $\rightarrow$ $\alpha$ -keto glutaric acid
0%
Malic acid $\rightarrow$ OAA

Explanation

In the succinyl CoA synthetase reaction, the thioester bond between HS-CoA and the succinyl group is hydrolyzed. Since it is a rich in energy bond, the energy released is enough for synthesizing GTP from GDP + (P). This GTP is equivalent, from the energetic point of view, to ATP. In fact, GTP can transfer the (P) group to ADP to form ATP:

GTP + ADP ————–à GDP + ATP

Since ATP can be produced from this reaction, without participation of the respiratory chain, this process is called Substrate Level Phosphorylation (SLP) in contrast to the Oxidative Phosphorylation (ATP synthesis using the energy released in the Electron Transport Chain).

So the correct option is 'succinyl- CoA

$\rightarrow$ succinic acid'.

How many ATP molecules will be produced when one molecule of

$3$ -phosphophoglyceric acid is completely oxidised?

0%
$16$
0%
$17$
0%
$32$
0%
$20$

Glycolysis is

0%
Anaerobic
0%
Aerobic
0%
Anaerobic and Aerobic both
0%
None

Explanation

Glycolysis is an anaerobic process as none of the steps involved in conversion of Glucose to Pyruvate utilize atmospheric

$O_2$

So, the correct answer is 'Anaerobic'

The common component of TCA cycle and electron transport chain is :

0%
Succinate dehydrogenase complex
0%
ATP synthase
0%
Acetyl CoA
0%
Succinyl CoA

In aerobic respiration one glucose produces?

0%
$8$ NADH $+2 FADH_2 +2$ ATP
0%
$12$ NADH $+2 FADH_2+ 38$ ATP
0%
$12$ NADH $+30$ ATP $+H_2O$
0%
$10$ NADH $+ 2FADH_2 +2$ ATP $+ 2$ GTP

$5$ molecules of pyruvic acid are used in Kreb's cycle it gives us?

0%
$50$ ATP
0%
$65$ ATP
0%
$75$ ATP
0%
$100$ ATP

How many TCA cycles are required during the complete oxidation of one sucrose molecule.

0%
4
0%
2
0%
1
0%
3

Explanation

$\textbf{Correct Option }$

$\textbf{Solution}$

$\bullet$ During a tricarboxylic acid cycle, also known as Krebs cycle the derivative of fats carbohydrates and proteins are converted into carbon dioxide.

$\bullet$ Sucrose is a disaccharide which is composed of glucose and fructose.

$\bullet$ We know that during the process of glycolysis two molecules of glucose forms for molecules of pyruvate.

$\bullet$ So from one sucrose molecule we can get molecules of glucose which will get converted into four molecules of pyruvate after glycolysis.

$\bullet$ During the TCA cycle one molecule of pyruvate undergoes complete oxidation. So, 4 molecules of pyruvate require 4 rounds of TCA cycle for complete oxidation.

$\bullet$ So one molecule of sucrose will acquire 4 cycle for complete oxidation.

$\bullet$ So, the correct option is A.

The common component of TCA cycle and electron transport chain is?

0%
Succinate dehydrogenase
0%
ATP synthase
0%
Acetyl Co-A
0%
Succinyl Co-A

The substance present between the product of first dephosphorylation and the subtrate of

$2^{nd}$ dephosphorylation in glycolysis is

0%
3 - PGA
0%
PEP
0%
2 - PGA
0%
1, 3 bis PGA

Calculate how many ATP molecules are directly synthesised in aerobic respiration from one glucose molecule?

0%
$2$ ATP
0%
$4$ ATP
0%
$6$ ATP
0%
$8$ ATP

How many ATPs are produced by substrate-level phosphorylation (SLP) in Krebs cycle from each glucose?

0%
2 ATP
0%
4 ATP
0%
8 ATP
0%
34 ATP

CBSE Questions for Class 11 Medical Biology Respiration In Plants Quiz 18 - MCQExams.com

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Practice Class 11 Medical Biology Quiz Questions and Answers

CBSE Questions for Class 11 Medical Biology Respiration In Plants Quiz 18 - MCQExams.com

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Practice Class 11 Medical Biology Quiz Questions and Answers

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