Respiration in Plants Test

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Respiration in Plants Test - 79

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Question 1
1 / -0

In which part of the cell does the process of aerobic respiration occur?

A
Mitochondrion

B
Cytoplasm

C
Nucleus

D
Cytoplasm and mitochondrion
Solution
- All living cells must carry out cellular respiration. It can be aerobic respiration in the presence of oxygen or anaerobic respiration.
- Prokaryotic cells carry out cellular respiration within the cytoplasm or on the inner surfaces of the cell. While eukaryotic cellular respiration occurs in mitochondria.
- Aerobic respiration includes glycolysis, kreb's cycle, and electron transport chain. Glycolysis occurs in the cytoplasm but it is considered an anaerobic process (part of both anaerobic and aerobic respiration).
- While kreb's cycle and ETC are exclusive processes of aerobic respiration and occur in mitochondria.
So the correct option is option A.
Question 2
1 / -0

In Krebs's cycle, the conversion of succinyl CoA to succinic acid requires?

A
Acetyl CoA$$+$$GDP$$+$$ip

B
CoA$$+$$GTP$$+$$ip

C
Acetyl CoA$$+$$GTP$$+$$ip

D
GDP$$+$$ip

Solution

In eukaryotes, the citric acid cycle takes place in the matrix of the mitochondria, just like the conversion of pyruvate to acetyl CoA. In prokaryotes, these steps both take place in the cytoplasm. The citric acid cycle is a closed loop; the last part of the pathway reforms the molecule used in the first step. the CoA of succinyl CoA is replaced by a phosphate group, which is then transferred to ADP to make ATP. In some cells,GDP—guanosine diphosphate—is used instead of ADP, forming GTP—guanosine triphosphate—as a product. The four-carbon molecule produced in this step is called succinate.
So the correct option is 'acetyl CoA + GTP + ip'.
Question 3
1 / -0

Compensation point is the value of the factor where there is

A
Neither photosynthesis nor respiration

B
Little photosynthesis

C
Photosynthesis is equal to the rate of respiration

D
Beginning of photosynthesis

Solution

The compensation point is the light intensity on the light curve for which the rate of photosynthesis is equal to the rate of respiration in the plant cell i.e., the rate of cellular fixation of Carbon dioxide through photosynthetic pathway is equal to the respiratory release of Carbon-dioxide and the release of Oxygen by photosynthesis is equals to the rate of consumption by respiration in a plant cell. At the compensation point, the organism is not building any biomass nor consuming any biomass.
So, the correct answer to the question is 'Photosynthesis is equal to the rate of respiration'.
Question 4
1 / -0

Electron transport chain is inhibited by?

A
Rotenone and amytal

B
Antimycin -A

C
Cyanide $$(CN^-)$$, azide $$(N^{3-})$$ and carbon monoxide $$(CO)$$

D
All of the above

Solution

The electron transport chain is the main source of ATP production in the body and carbon monoxide which inhibit the final electron acceptor. Respiration inhibitor. Blocks the respiratory chain at complex 3 between cytochrome b and cytochrome c1. Therefore prevents the oxidation of both NADH and succinate. The most important known inhibitors of the ETC are Amytal, Rotenone, Antimycin A, CO, Sodium Azide, and Cyanides. Amytal, a barbiturate, and Rotenone, a plant product used as insecticide and pesticide, block the ETC between NADH dehydrogenase.
So the correct answer is 'All of the above'
Question 5
1 / -0

One of the following is common to glycolysis as well as Krebs cycle in eukaryotes.

A
Substrate level phosphorylation

B
Photophosphorylation

C
Localization in mitochondria

D
Production of $$FADH_2$$
Solution
- Substrate-level phosphorylation is a metabolic reaction that results in the formation of ATP or GTP by the direct transfer of a phosphoryl (PO3) group to ADP or GDP from another phosphorylated compound.
- The first substrate-level phosphorylation occurs after the conversion of 3-phosphoglyceraldehyde and Pi and NAD+ to 1,3-bisphosphoglycerate via glyceraldehyde 3-phosphate dehydrogenase.
- The second substrate-level phosphorylation occurs by dephosphorylating phosphoenolpyruvate, catalyzed by pyruvate kinase, producing pyruvate and ATP.
- Hence, One of the following is common to glycolysis as well as Krebs cycle in eukaryotes is Substrate level phosphorylation.
- So, the correct answer is 'Substrate level phosphorylation'.
Question 6
1 / -0

Mark the incorrect statement.

A
Breaking of C-O bonds of complex molecules by oxidation cells leading to the release of a lot of energy is called cellular respiration.

B
Initial stage of respiration takes place in cytoplasm.

C
Incomplete oxidation of pyruvate by the stepwise removal of all the hydrogen atoms, leaving three molecules of CO$$_2$$.

D
TCA cycle starts with the condensation of acetyl group with OAA and water to yield citric acid.
Question 7
1 / -0

Select the number of incorrect statements for the process of fermentation.
A . It involves only partial breakdown of glucose.
B $$NADH_2$$ is oxidized to NAD by reduction of organic compound.
C. No ATP are produced during fermentation as it is extracellular process in some microbes.
D. There is no ETS and Kreb's cycle.
E. Maximum concentration of alcohol in alcohol in alcoholic brevarage is 100 %.

A
2

B
3

C
4

D
5
Solution
- Fermentation can be defined as the partial breakdown of glucose to produce ethyl alcohol and carbon dioxide.
- It releases energy in form of ATP molecules.
- 2 ATP molecules are produced per glucose.
- 2NADH molecules provide energy which converts pyruvate into lactic acid.
- The maximum concentration of alcohol in alcoholic beverages is 15%-16%.
- Option C and E are incorrect statements.
- So, the correct answer is'2'.
Question 8
1 / -0

The three boxes in this diagram represent the three major biosynthesis pathways in aerobic respiration. Arrows represent net reactants or products.
Arrow numbered $$4$$, $$8$$ and $$12$$ can all be?

A
NADH

B
ATP

C
$$H_2O$$

D
$$FAD^+$$ or $$FADH_2$$
Solution
- During glycolysis, the carboxylic acid, nicotinamide adenine dinucleotide (NAD+), is reduced to NADH, but this must be regenerated for glycolysis to continue.
- In the presence of oxygen, the NADH is oxidized to NAD+ within the mitochondria, producing pyruvate.
- The eight steps of the citric acid cycle are a series of redox, dehydration, hydration, and decarboxylation reactions. Each turn of the cycle forms one GTP or ATP as well as three NADH molecules and one FADH2 molecule, which will be used in further steps of cellular respiration to produce ATP for the cell.
- Hence, Arrow numbered 4, 8 and 12 can all be NADH.
- So, the correct answer is 'NADH'.
Question 9
1 / -0

Which of the following correctly shows the difference in the products of glycolysis and Krebs cycle per glucose molecule?

A
Glycolysis - 4 ATP, 1 reduced NAD, Krebs Cycle - 4 reduced NAD, 1 reduced FAD, 1 ATP

B
Glycolysis - 4 ATP, 2 reduced NAD, Krebs Cycle - 8 reduced NAD, 2 reduced FAD, 2 ATP

C
Glycolysis - 2 ATP, 1 reduced NAD, Krebs Cycle - 3 reduced NAD, 1 reduced FAD, 1 ATP

D
Glycolysis - 2 ATP, 2 reduced NAD, Krebs Cycle - 6 reduced NAD, 2 reduced FAD, 2 ATP

Solution

In glycolysis, 2 net ATP is generated along with 1 NADH.
2 pyruvate enter the link reaction forming acetyl CoA.
Two acetyl CoA enter Krebs cycle forming 1 x 2=GTP (which is equivalent to two ATP) and 3 x 2= 6NADH and 2 x 1=2FADH$$_2$$.
So, the correct option is '
Glycolysis - 2 ATP, 2 reduced NAD, Krebs Cycle - 6 reduced NAD, 2 reduced FAD, 2 ATP
'
Question 10
1 / -0

The end product of glycolysis is

A
ATP (Adenosine triphoshate )

B
Protien

C
Carbohydrates

D
All of the above
Solution
- Glycolysis is a series of catabolic reactions which breaks down large molecules into smaller ones.
- During glycolysis, glucose is broken down to form pyruvate and also produces two molecules of ATP.
So, the correct answer is 'ATP'.

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Glycolysis - 2 ATP, 2 reduced NAD, Krebs Cycle - 6 reduced NAD, 2 reduced FAD, 2 ATP

Respiration in Plants Test - 79

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Respiration in Plants Test - 79

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SHARING IS CARING

Question 1

Mitochondrion

Cytoplasm

Nucleus

Cytoplasm and mitochondrion

Solution

Question 2

Acetyl CoA$$+$$GDP$$+$$ip

CoA$$+$$GTP$$+$$ip

Acetyl CoA$$+$$GTP$$+$$ip

GDP$$+$$ip

Solution

Question 3

Neither photosynthesis nor respiration

Little photosynthesis

Photosynthesis is equal to the rate of respiration

Beginning of photosynthesis

Solution

Question 4

Rotenone and amytal

Antimycin -A

Cyanide $$(CN^-)$$, azide $$(N^{3-})$$ and carbon monoxide $$(CO)$$

All of the above

Solution

Question 5

Substrate level phosphorylation

Photophosphorylation

Localization in mitochondria

Production of $$FADH_2$$

Solution

Question 6

Breaking of C-O bonds of complex molecules by oxidation cells leading to the release of a lot of energy is called cellular respiration.

Initial stage of respiration takes place in cytoplasm.

Incomplete oxidation of pyruvate by the stepwise removal of all the hydrogen atoms, leaving three molecules of CO$$_2$$.

TCA cycle starts with the condensation of acetyl group with OAA and water to yield citric acid.

Question 7

2

3

4

5

Solution

Question 8

NADH

ATP

$$H_2O$$

$$FAD^+$$ or $$FADH_2$$

Solution

Question 9

Glycolysis - 4 ATP, 1 reduced NAD, Krebs Cycle - 4 reduced NAD, 1 reduced FAD, 1 ATP

Glycolysis - 4 ATP, 2 reduced NAD, Krebs Cycle - 8 reduced NAD, 2 reduced FAD, 2 ATP

Glycolysis - 2 ATP, 1 reduced NAD, Krebs Cycle - 3 reduced NAD, 1 reduced FAD, 1 ATP

Glycolysis - 2 ATP, 2 reduced NAD, Krebs Cycle - 6 reduced NAD, 2 reduced FAD, 2 ATP

Solution

Question 10

ATP (Adenosine triphoshate )

Protien

Carbohydrates

All of the above

Solution

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