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Test: Respiration - 1 - UPSC MCQ


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10 Questions MCQ Test Science & Technology for UPSC CSE - Test: Respiration - 1

Test: Respiration - 1 for UPSC 2025 is part of Science & Technology for UPSC CSE preparation. The Test: Respiration - 1 questions and answers have been prepared according to the UPSC exam syllabus.The Test: Respiration - 1 MCQs are made for UPSC 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Respiration - 1 below.
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Test: Respiration - 1 - Question 1

Which of these is not a raw material for photosynthesis?

Detailed Solution for Test: Respiration - 1 - Question 1

organism prepare their own food with the help of simple inorganic materials like CO2,H2O in sunlight with the help of chlorophyll. Thus, it doesn’t involve oxygen in the process.

Test: Respiration - 1 - Question 2

The form of energy used in respiration is –

Detailed Solution for Test: Respiration - 1 - Question 2

Cellular respiration is the process of breaking sugar into a form that the cell can use as energy. This happens in all forms of life. Cellular respiration takes in food and uses it to create ATP, a chemical which the cell uses for energy. Usually, this process uses oxygen, and is called aerobic respiration.

Test: Respiration - 1 - Question 3

The narrowest and most numberous tubes of lungs are termed as –

Detailed Solution for Test: Respiration - 1 - Question 3

Bronchiole is a fine respiratory tube in the lungs of reptiles, birds and mammals. It is formed by the subdivision of a bronchus. 

Test: Respiration - 1 - Question 4

In anaerobic respiration –

Detailed Solution for Test: Respiration - 1 - Question 4

Anaerobic respiration occurs in the absence of oxygen. During this process:

  • Glucose is broken down into ethanol or lactic acid.
  • Carbon dioxide is produced as a by-product.
  • Energy is released, typically yielding 2 ATP molecules.

In anaerobic conditions:

  • Yeast converts glucose into ethanol and carbon dioxide.
  • In muscle cells, pyruvate is converted into lactic acid when oxygen is scarce.

This process is less efficient than aerobic respiration, which occurs in the presence of oxygen and produces more energy.

Test: Respiration - 1 - Question 5

Which of the following statements about the breathing cycle is true?

Detailed Solution for Test: Respiration - 1 - Question 5

Explanation of the Breathing Cycle:

  • The lungs are never completely empty. After exhalation, a certain amount of air, known as residual volume, remains.
  • This residual volume ensures that the lungs maintain structural integrity and continue to facilitate gas exchange.
  • It is crucial for the lungs to always have some air to prevent collapse and to support the continual exchange of oxygen and carbon dioxide.
Test: Respiration - 1 - Question 6

Oxygen in lungs ultimately reaches –

Detailed Solution for Test: Respiration - 1 - Question 6

The alveoli are the final branchings of the respiratory tree and act as the primary gas exchange units of the lung. Inhaled oxygen enters the lungs and reaches the alveoli. 

Test: Respiration - 1 - Question 7

In the experiment demonstrating respiration in germinating seeds, KOH is used to :

Detailed Solution for Test: Respiration - 1 - Question 7

For the experiment where CO2  is given out during respiration, KOH solution are taken in a test tube and placed kn the conical flask KOH absorbs carbon dioxide and prevents it from being utilized by the plant for the process of photosynthesis.

Test: Respiration - 1 - Question 8

Plant can respire in :

Detailed Solution for Test: Respiration - 1 - Question 8

Respiration is constitutive process that occurs in all tissues. Unlike photosynthesis that can happen only in the presence of sunlight, respiration in plant occurs all time. So, the answer is - both light and dark.

Test: Respiration - 1 - Question 9

Exchange of gases in lung alveoli occurs through –

Detailed Solution for Test: Respiration - 1 - Question 9

Because in alveoli( richly supplied with blood vessels), where oxygenated blood is present, is absorbed by haemoglobin, present in the RBC(Red Blood Cell). With the help of haemoglobin, the oxygenated blood is diffused in the whole body. Where on the other side, deoxygenated blood, which is present in the plasma, is reached to the alveoli and it absorbs by our lungs then finally the deoxygenated blood is exhaled by our nostrils. This is how alveoli helps for respiration with the help of diffusion in our lungs.

Test: Respiration - 1 - Question 10

Haemoglobin is –

Detailed Solution for Test: Respiration - 1 - Question 10

the hemoglobin increases the oxygen carrying capacity of blood. In humans and most other vertebrates, the most common respiratory pigment is a protein called hemoglobin.

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