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Test: Respiration - 2 - Class 10 MCQ


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20 Questions MCQ Test Science Class 10 - Test: Respiration - 2

Test: Respiration - 2 for Class 10 2024 is part of Science Class 10 preparation. The Test: Respiration - 2 questions and answers have been prepared according to the Class 10 exam syllabus.The Test: Respiration - 2 MCQs are made for Class 10 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Respiration - 2 below.
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Test: Respiration - 2 - Question 1

Which term describes the process of respiration through the skin?

Detailed Solution for Test: Respiration - 2 - Question 1
Cutaneous Respiration refers to the process of respiration through the skin. In organisms like frogs, the skin plays a vital role in gas exchange, allowing oxygen and carbon dioxide to diffuse through the thin, moist skin surface. This adaptation is particularly important for amphibious animals like frogs that can respire through both their skin and lungs.
Test: Respiration - 2 - Question 2

What are the end products of aerobic respiration when glucose is completely oxidized?

Detailed Solution for Test: Respiration - 2 - Question 2
When glucose is completely oxidized in aerobic respiration, the end products are carbon dioxide and water. This process involves the breakdown of glucose through multiple steps, including glycolysis and the Krebs cycle, ultimately leading to the production of carbon dioxide and water as waste products. This efficient process generates a significant amount of ATP for cellular energy.
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Test: Respiration - 2 - Question 3

Why do air-breathing land animals lose water through evaporation from their respiratory surfaces?

Detailed Solution for Test: Respiration - 2 - Question 3
Air-breathing land animals lose water through evaporation from their respiratory surfaces due to the evaporative power of air. The respiratory surfaces of these animals are moist to facilitate gas exchange, but this moisture can lead to water loss through evaporation. This phenomenon is a necessary trade-off for efficient respiration in terrestrial environments.
Test: Respiration - 2 - Question 4
What is the purpose of using lime water in the setup described in the fermentation experiment?
Detailed Solution for Test: Respiration - 2 - Question 4
Lime water is utilized in the fermentation experiment setup to capture the carbon dioxide released during the fermentation process. The milky appearance of the lime water after some time indicates the liberation of CO2 from the sugar solution and yeast mixture. This observation helps demonstrate the production of carbon dioxide as a byproduct of fermentation.
Test: Respiration - 2 - Question 5
Why is a one-holed cork used to close the opening of the test tube in the fermentation experiment?
Detailed Solution for Test: Respiration - 2 - Question 5
The one-holed cork is employed to close the opening of the test tube in the fermentation experiment to prevent air from entering. This setup helps create an anaerobic environment necessary for the fermentation process to occur efficiently. By limiting the entry of air, the fermentation process can proceed without interference, allowing the yeast to convert sugar into alcohol and carbon dioxide.
Test: Respiration - 2 - Question 6
What does the milky appearance of lime water in the fermentation experiment indicate?
Detailed Solution for Test: Respiration - 2 - Question 6
The milky appearance of lime water in the fermentation experiment serves as an indicator of the release of carbon dioxide. This change occurs as a result of the carbon dioxide liberated from the sugar solution and yeast mixture during the fermentation process. The observation of lime water turning milky provides visual evidence of the production of CO2, showcasing one of the outcomes of the fermentation of sugar.
Test: Respiration - 2 - Question 7
What is the primary purpose of respiration in living organisms?
Detailed Solution for Test: Respiration - 2 - Question 7
The primary purpose of respiration in living organisms is to break down food sources, such as glucose, to release energy for cellular needs. This process involves the intake of oxygen to facilitate the breakdown of food molecules and the production of ATP, the cellular energy currency. Without respiration, cells would not be able to generate the necessary energy for essential functions.
Test: Respiration - 2 - Question 8

What is the primary function of respiratory organs in various animals according to the provided information?

Detailed Solution for Test: Respiration - 2 - Question 8

The primary function of respiratory organs in animals, as outlined is the exchange of respiratory gases. These organs have specialized structures that facilitate the diffusion of gases, such as oxygen and carbon dioxide, to meet the metabolic demands of the organism. This process is essential for cellular respiration and energy production within the body.

Test: Respiration - 2 - Question 9
Why is water considered less suitable for respiration compared to air for many aquatic animals?
Detailed Solution for Test: Respiration - 2 - Question 9
Water is considered less suitable for respiration than air for many aquatic animals because water is denser than air, requiring more energy to pass over the respiratory surface. Additionally, the solubility of oxygen in water is lower compared to air, meaning a given volume of water contains less oxygen than the same volume of air. These factors make respiration more challenging in aquatic environments.
Test: Respiration - 2 - Question 10

What is a key difference between respiration and combustion processes based on the provided content?

Detailed Solution for Test: Respiration - 2 - Question 10

Respiration is a biochemical process that takes place in living cells to release energy. Combustion is a chemical process that occurs outside living cells or living systems. Respiration is a controlled biological process. Combustion is an uncontrolled process.

Test: Respiration - 2 - Question 11
What defines fermentation as a process according to the provided information?
Detailed Solution for Test: Respiration - 2 - Question 11
Fermentation is a type of anaerobic respiration carried out primarily by fungi and bacteria. It involves the breakdown of carbohydrates and other organic compounds outside the cell in a liquid medium, leading to the formation of alcohol, organic acids, gases, etc.
Test: Respiration - 2 - Question 12
What distinguishes oxidative phosphorylation from photophosphorylation based on the information provided?
Detailed Solution for Test: Respiration - 2 - Question 12
The key distinction between oxidative phosphorylation and photophosphorylation is that photophosphorylation is driven by light energy, specifically in the process of photosynthesis. This mechanism occurs in the chloroplasts of plant cells and involves the synthesis of ATP using light energy.
Test: Respiration - 2 - Question 13

In what way does aerobic respiration differ from anaerobic respiration, as mentioned?

Detailed Solution for Test: Respiration - 2 - Question 13

Aerobic respiration differs from anaerobic respiration in that it requires oxygen for the breakdown of glucose. This process occurs in the presence of oxygen and involves the complete oxidation of glucose to carbon dioxide and water, releasing a significant amount of energy.

Test: Respiration - 2 - Question 14
What is the purpose of adding yeast to the fruit juice or sugar solution in the fermentation process?
Detailed Solution for Test: Respiration - 2 - Question 14
Yeast is added to the fruit juice or sugar solution in the fermentation process to release carbon dioxide. This is evident in the experiment described, where the observation of lime water turning milky indicates the liberation of CO2 from the mixture of sugar solution and yeast. The production of ethyl alcohol and CO2 is a result of the fermentation of sugar, showcasing the role of yeast in this process.
Test: Respiration - 2 - Question 15

Which of the following represents the correct sequence of stages in aerobic respiration?

Detailed Solution for Test: Respiration - 2 - Question 15

The correct sequence of stages in aerobic respiration is glycolysis, Krebs cycle, and electron transport system. During aerobic respiration, glucose is first broken down into pyruvate through glycolysis in the cytoplasm. The pyruvate then enters the mitochondria to undergo the Krebs cycle, where further breakdown occurs. Finally, the electron transport system located in the inner mitochondrial membrane facilitates the production of ATP through a series of redox reactions involving electron carriers. This sequential process efficiently harvests energy from glucose molecules to generate ATP for cellular functions.

Test: Respiration - 2 - Question 16
What is the main difference between aerobic and anaerobic respiration?
Detailed Solution for Test: Respiration - 2 - Question 16
The main difference between aerobic and anaerobic respiration is that aerobic respiration produces a significantly larger amount of ATP compared to anaerobic respiration. Aerobic respiration, which occurs in the presence of oxygen, is a more efficient process for generating ATP from glucose molecules. In contrast, anaerobic respiration produces less ATP and does not require oxygen as a final electron acceptor, leading to the production of substances like lactic acid or ethanol as byproducts.
Test: Respiration - 2 - Question 17

What conditions do proteins serve as respiratory substrates?

Detailed Solution for Test: Respiration - 2 - Question 17

Proteins serve as respiratory substrates when carbohydrates and fats are not readily available for energy production. In such circumstances, proteins are utilized as an alternative source of energy through the process of respiration. This highlights the flexibility of the human body in utilizing different macronutrients based on availability and metabolic needs.

Test: Respiration - 2 - Question 18
What term did Blackman use to describe the respiratory oxidation of carbohydrates according to the provided content?
Detailed Solution for Test: Respiration - 2 - Question 18
Blackman termed the respiratory oxidation of carbohydrates as "floating respiration." This term refers to the process by which carbohydrates, such as glucose and fructose, are oxidized during respiration to release energy for cellular functions. The concept of floating respiration underscores the importance of carbohydrates as primary energy sources in biological systems.
Test: Respiration - 2 - Question 19
Which organelles in cells are involved in the process of aerobic respiration?
Detailed Solution for Test: Respiration - 2 - Question 19
Mitochondria are the organelles involved in the process of aerobic respiration. These membrane-bound organelles are often referred to as the powerhouse of the cell because they are responsible for producing ATP, the energy currency of the cell, through the process of aerobic respiration. Within the mitochondria, various stages of aerobic respiration, including the Krebs cycle and the electron transport system, take place to generate ATP efficiently.
Test: Respiration - 2 - Question 20

Which of the following is NOT mentioned as a respiratory substrate in the provided content?

Detailed Solution for Test: Respiration - 2 - Question 20

The mentions carbohydrates (such as glucose, fructose, and sucrose), fats, and proteins as potential respiratory substrates. However, vitamins are not specifically highlighted as respiratory substrates in the provided content. Respiratory substrates are essential sources of energy that can be oxidized during the process of respiration to fuel cellular activities.

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