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Biology – Botany

Respiration in Plants

Respiration in Plants

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Study Action Plan (Sorted by Difficulty)
Aerobic Respiration vs Fermentation
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High
Electron Transport System (ETS)
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Fermentation
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Respiratory Balance Sheet
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Respiratory Quotient (RQ)
Accuracy: 33%
Total Attempted3
Total Correct1
Total Incorrect2
Difficulty Level:
High
Amphibolic Pathway
Accuracy: 50%
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Medium
Glycolysis
Accuracy: 67%
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Medium
Oxidative Phosphorylation
Accuracy: 67%
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Medium
Krebs Cycle
Accuracy: 80%
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Total Correct4
Total Incorrect1
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Low
Aerobic Respiration
Accuracy: 100%
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Low
Fate of Pyruvate
Accuracy: 100%
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Low
Plant Respiration and Gaseous Exchange
Accuracy: 100%
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Pyruvate Oxidation / Link Reaction
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Low
Respiration, Combustion and Stepwise Energy Release
Accuracy: 100%
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Respiratory Substrates and ATP as Energy Currency
Accuracy: 100%
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Low

Learning Objectives

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Learning Objectives

  • Understand the process of respiration in plants.
  • Differentiate between respiration and combustion.
  • Explain the steps involved in glycolysis and its significance.
  • Describe the process of fermentation and its types.
  • Outline the stages of aerobic respiration and the role of mitochondria.
  • Define the respiratory quotient (RQ) and its significance in respiration.
  • Discuss the concept of the amphibolic pathway in respiration.
  • Identify the differences between aerobic and anaerobic respiration.
  • Analyze the role of various respiratory substrates in energy production.

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Revision Notes & Summary

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Respiration in Plants

12.1 Do Plants Breathe?

  • Breathing is essential for life.
  • All living organisms, including plants and microbes, breathe.

12.2 Glycolysis

  • Energy is required for daily life activities (absorption, transport, movement, reproduction).
  • Glycolysis is the process where glucose is partially oxidized to form two molecules of pyruvic acid.
  • Occurs in the cytoplasm of all living organisms.

12.3 Fermentation

  • Occurs under anaerobic conditions.
  • Can lead to lactic acid or alcohol fermentation.

12.4 Aerobic Respiration

  • Takes place in the mitochondria.
  • Involves complete oxidation of pyruvate, producing CO₂ and ATP.
  • Key steps:
    • Pyruvate enters the mitochondria.
    • Oxidative decarboxylation occurs, producing Acetyl CoA.
    • Acetyl CoA enters the Krebs cycle.

12.5 The Respiratory Balance Sheet

  • Net gain of ATP during aerobic respiration of one glucose molecule is 38 ATP.
  • Assumptions for calculations:
    • Sequential pathway functioning.
    • NADH from glycolysis is transferred to mitochondria.
    • Only glucose is respired.

12.6 Amphibolic Pathway

  • The respiratory pathway involves both anabolism and catabolism.

12.7 Respiratory Quotient (RQ)

  • RQ = volume of CO₂ evolved / volume of O₂ consumed.
  • RQ varies with the type of respiratory substrate:
    • Carbohydrates: RQ = 1
    • Fats: RQ < 1
    • Proteins: RQ ≈ 0.9

Important Processes

  • Oxidative Phosphorylation: ATP synthesis linked to electron transport.
  • Electron Transport System (ETS): Located on the inner mitochondrial membrane, crucial for ATP production.

Key Metabolic Pathways

  • Glycolysis: Converts glucose to pyruvate.
  • Krebs Cycle: Processes Acetyl CoA to produce CO₂ and energy carriers (NADH, FADH₂).
  • ATP Synthesis: Involves ATP synthase and proton gradient.
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Practice Test – MCQs, True/False

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Multiple Choice Questions

A.

Carbon dioxide (CO2CO_2)

B.

Water (H2OH_2O)

C.

Oxygen (O2O_2)

D.

NADH
Correct Answer: C

Solution:

Oxygen (O2O_2) acts as the final electron acceptor in the electron transport chain, forming water.

Chapter Concept:

Aerobic Respiration

A.

It occurs in the mitochondrial matrix.

B.

It directly produces a large amount of ATP.

C.

It generates NADH and FADH₂.

D.

It involves decarboxylation reactions.
Correct Answer: B

Solution:

The Krebs cycle does not directly produce a large amount of ATP; it produces GTP and reduces NAD⁺ and FAD to NADH and FADH₂, which are used in the electron transport chain to produce ATP.

Chapter Concept:

Krebs Cycle

A.

Glycolysis \rightarrow Pyruvate Oxidation \rightarrow Krebs Cycle \rightarrow Electron Transport Chain

B.

Krebs Cycle \rightarrow Glycolysis \rightarrow Electron Transport Chain \rightarrow Pyruvate Oxidation

C.

Electron Transport Chain \rightarrow Glycolysis \rightarrow Krebs Cycle \rightarrow Pyruvate Oxidation

D.

Pyruvate Oxidation \rightarrow Electron Transport Chain \rightarrow Glycolysis \rightarrow Krebs Cycle
Correct Answer: A

Solution:

In aerobic respiration, glucose undergoes glycolysis to form pyruvate, which is oxidized to acetyl CoA entering the Krebs Cycle, followed by the Electron Transport Chain for ATP production.

Chapter Concept:

Plant Respiration and Gaseous Exchange

A.

All pathways work simultaneously and not sequentially.

B.

ATP is not utilized as needed.

C.

NADH is not transferred to mitochondria.

D.

Glucose is the only substrate used.
Correct Answer: A

Solution:

In living systems, pathways work simultaneously, substrates enter and exit as needed, and ATP is used on demand, which leads to a difference from the theoretical yield.

Chapter Concept:

Respiratory Balance Sheet

A.

To act as the final electron acceptor in the electron transport chain.

B.

To directly phosphorylate ADP to ATP.

C.

To oxidize NADH to NAD+.

D.

To provide energy for the synthesis of glucose.
Correct Answer: A

Solution:

Oxygen acts as the final electron acceptor in the electron transport chain, allowing for the formation of water and enabling the continuation of the electron flow.

Chapter Concept:

Oxidative Phosphorylation

A.

Both processes release energy, but cellular respiration captures energy in ATP while combustion releases it as heat.

B.

Cellular respiration occurs only in plants, whereas combustion occurs only in animals.

C.

Combustion is a stepwise process controlled by enzymes, while cellular respiration is a single-step energy release.

D.

Both processes require oxygen and produce the same amount of energy per molecule of glucose.
Correct Answer: A

Solution:

Cellular respiration is a stepwise enzymatic process that captures energy in the form of ATP, unlike combustion, which releases energy primarily as heat.

Chapter Concept:

Respiration, Combustion and Stepwise Energy Release

A.

Acts as a proton pump

B.

Transfers electrons between complex III and IV

C.

Synthesizes ATP

D.

Oxidizes NADH
Correct Answer: B

Solution:

Cytochrome c is a small protein that transfers electrons between complex III (cytochrome bc₁) and complex IV (cytochrome c oxidase) in the ETS.

Chapter Concept:

Electron Transport System (ETS)

A.

Pyruvate dehydrogenase complex

B.

Citrate synthase

C.

ATP synthase

D.

Lactate dehydrogenase
Correct Answer: A

Solution:

The pyruvate dehydrogenase complex catalyzes the oxidative decarboxylation of pyruvic acid, converting it into acetyl CoA.

Chapter Concept:

Aerobic Respiration

A.

Ethanol

B.

Lactic acid

C.

Acetyl CoA

D.

Carbon dioxide
Correct Answer: B

Solution:

Under anaerobic conditions, such as in muscle cells during intense exercise, pyruvate is reduced to lactic acid by the enzyme lactate dehydrogenase.

Chapter Concept:

Fate of Pyruvate

A.

To act as a substrate for glycolysis

B.

To serve as the final electron acceptor in the electron transport chain

C.

To directly convert glucose into energy

D.

To initiate the Krebs' cycle
Correct Answer: B

Solution:

In aerobic respiration, oxygen serves as the final electron acceptor in the electron transport chain, allowing for the production of water and the continuation of the process.

Chapter Concept:

Respiration, Combustion and Stepwise Energy Release

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Respiration in Plants

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True or False

Correct Answer: False

Solution:

Cellular respiration involves the stepwise enzymatic oxidation of glucose, allowing energy to be trapped in ATP, unlike combustion which releases energy mostly as heat in a single step.

Chapter Concept :

Respiration, Combustion and Stepwise Energy Release

Correct Answer: True

Solution:

Aerobic respiration is characterized by the complete oxidation of glucose in the presence of oxygen, which produces CO2CO_2, H2OH_2O, and a significant amount of ATP through glycolysis, the Krebs cycle, and the electron transport chain.

Chapter Concept :

Aerobic Respiration

Correct Answer: False

Solution:

Fermentation is an anaerobic process where pyruvic acid is converted into lactic acid or ethanol and CO2CO_2, not resulting in complete oxidation of glucose.

Chapter Concept :

Fermentation

Correct Answer: True

Solution:

The respiratory quotient (RQ) is defined as the ratio of the volume of CO2CO_2 evolved to the volume of O2O_2 consumed, indicating the type of substrate being metabolized.

Chapter Concept :

Respiratory Quotient (RQ)

Correct Answer: False

Solution:

Unlike animals, plants do not have specialized organs for gaseous exchange. They rely on stomata and lenticels for this process.

Chapter Concept :

Plant Respiration and Gaseous Exchange

Correct Answer: True

Solution:

Oxidative phosphorylation is the process where ATP is synthesized as electrons are transferred through the ETS, creating a proton gradient across the inner mitochondrial membrane.

Chapter Concept :

Oxidative Phosphorylation

Correct Answer: True

Solution:

Oxygen is the final electron acceptor in the ETS, where it combines with electrons and protons to form water, completing the electron transport chain.

Chapter Concept :

Electron Transport System (ETS)

Correct Answer: True

Solution:

The respiratory quotient (RQ) is defined as the ratio of the volume of CO2CO_2 evolved to the volume of O2O_2 consumed during respiration, indicating the type of substrate being metabolized.

Chapter Concept :

Respiratory Quotient (RQ)

Correct Answer: True

Solution:

The ETS is indeed located in the inner mitochondrial membrane where it facilitates the transfer of electrons from NADHNADH and FADH2FADH_2 to oxygen, driving ATP synthesis.

Chapter Concept :

Electron Transport System (ETS)

Correct Answer: True

Solution:

Oxidative phosphorylation is the process of ATP synthesis driven by the transfer of electrons through the electron transport system (ETS) and the creation of a proton gradient across the inner mitochondrial membrane.

Chapter Concept :

Oxidative Phosphorylation

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