Biology

Respiration and Gas Transport

647 Questions

Respiration and gas transport deal with the physiological mechanisms of breathing, including the role of hemoglobin in oxygen transport and the removal of carbon dioxide from the blood. Questions cover both aerobic and anaerobic processes, along with related phenomena like altitude sickness. This human biology topic is a staple in the science sections of competitive tests.

Oxygen and hemoglobin transportAnaerobic respiration effectsCarbon dioxide removalAltitude sickness causesBreathing rate regulation

Respiration and Gas Transport Questions

Multiple choice bio-chemistry carbohydrate metabolism energy output living organisms and energy production respiration in cell

Which one of the following equations represents the Aerobic respiration?

  1. $6CO _2\,+\,6H _2O\,\rightarrow \,C _6H _{12}O _6\,+\,6O _2$
  2. $C _6H _{10}O _2\,+\,6O _2\,\rightarrow\,6CO _2\,+\,5H _2O\,+\,674Kcal$
  3. $C _6H _{12}O _6\,+\,6O _2\,\rightarrow\,6CO _2\,+\,6H _2O\,+\,674Kcal$
  4. $C _6H _{12}O _2\,+\,6O _2\,\rightarrow\,6H _2CO _3$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The equation C6H12O6 + 6O2 -> 6CO2 + 6H2O + 674 kcal represents the overall balanced chemical equation for aerobic cellular respiration.

Multiple choice biology molecular biology fermentation cell respiration living organisms and energy production

In which of the following, respiration takes place in absence of oxygen?

  1. Man

  2. Potato

  3. Yeast

  4. Spirogyra
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Respiration is the catabolic process in which reduced substrates are broken down. The process of respiration can occur in presence of oxygen (aerobic respiration) or absence of oxygen (anaerobic respiration). The process of anaerobic respiration is also called as fermentation. In some microorganisms like yeast, the process of anaerobic respiration (fermentation) results in incomplete breakdown of glucose to ethanol and carbon dioxide. 

Multiple choice biology respiration fermentation cell respiration living organisms and energy production

Aerobic respiration is more advantageous than anaerobic respiration because

  1. It requires oxygen

  2. It produces more energy

  3. It causes complete breakdown of respiratory substrate

  4. Aerobic respiration produces water.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The oxidative breakdown of respiratory substrates with the help of atmospheric oxygen is known as aerobic respiration. It involves a complete breakdown of substrates into carbon dioxide and water releasing energy. The energy released per mole of glucose is 686 Kcal or 2870 kJ. 

Oxidation of respiratory substrates in the absence of atmospheric oxygen is termed as anaerobic respiration. It involves an incomplete breakdown of respiratory substrates in which the end products such as ethanol or lactic acid are produced and carbon dioxide is released. The amount of energy released in this case is 247 kJ.
Since the energy released is more in aerobic respiration, it is more advantageous. Thus, the correct answer is option B. 

Multiple choice

Which of the following is true regarding aerobic and anaerobic respiration?

  1. Aerobic respiration uses oxygen, anaerobic does not.

  2. Both anaerobic and aerobic respiration use oxygen

  3. Anaerobic respiration uses oxygen, aerobic does not.

  4. Neither aerobic nor anaerobic respiraiton use oxygen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The fundamental difference between the two processes is the requirement for oxygen; aerobic respiration uses oxygen as the final electron acceptor, while anaerobic does not.

Multiple choice

Oxygen ________ by red blood cells.

  1. carrying

  2. is carrying

  3. carried

  4. is carried
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

"Oxygen" is an uncountable singular noun that receives the action. The passive voice is needed here, making "is carried" the correct choice.

Multiple choice

What process below releases primarily oxygen into the atmosphere?

  1. Respiration

  2. Osmosis

  3. Combustion

  4. Photosynthesis
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to produce glucose, releasing oxygen as a byproduct into the atmosphere. Cellular respiration and combustion, by contrast, consume oxygen and release carbon dioxide.

Multiple choice

Which steriod increases red blood cells, which carry more oxygen.

  1. androstenediol

  2. Bromantan

  3. Erythropoietin

  4. Probenecid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Erythropoietin (EPO) is a hormone that stimulates the bone marrow to produce more red blood cells. While chemically a peptide hormone rather than a steroid, it is often grouped with performance-enhancing substances in sports because it increases oxygen delivery to muscles.

Multiple choice

The RBCs present in the blood are responsible for absorbing oxygen and transporting it to all the cells of the body.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Red blood cells contain a specialized iron-rich protein called hemoglobin, which binds to oxygen molecules in the lungs. As these cells travel through the circulatory system, they release oxygen to tissues and organs that need it for cellular respiration. This makes the statement entirely true.

Multiple choice

What are the raw materials of respiration?

  1. oxygen and water

  2. sugar(food) and oxygen

  3. carbon dioxide and water

  4. sugar (food) and carbon dioxide
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cellular respiration requires glucose (sugar) and oxygen as reactants to produce energy. These starting substances, or raw materials, undergo a chemical reaction inside cells to yield carbon dioxide, water, and ATP.