Biology

Respiration and Gas Transport

606 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

Which of the following statements is/are false?

a. In anaerobic respiration, the organisms break down the food into carbon dioxide and water. b. Mitochondria are the sites of aerobic respiration in the cells. c. Muscle cramps are caused by the accumulation of lactic acid in the muscles.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option as this statement is false. In anaerobic respiration, the organisms break down the food into carbon dioxide and ethanol.

Multiple choice

Which of the following facts about RBC is false?

  1. It carries dissolved nutrients and hormones.

  2. It contains haemoglobin.

  3. With oxygen, it is bright red in colour.

  4. They are circular in shape.

  5. It does not have nucleus.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This function is carried out by plasma; another blood component.

Multiple choice

Which of the following may be the reason for the death of a person due to heavy bleeding in an accident?

  1. Low level of carbon dioxide through blood

  2. Loss of basophils through blood

  3. Due to infection in the wounded site

  4. Due to loss of memory

  5. Due to low oxygen count
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The amount of blood loss that may lead to complications depends on the individual person. It is affected by factors such as body size and the presence of certain health conditions such as anemia. Blood count means how much of the oxygen carrying haemoglobin is present in blood. If the count is too low due to heavy blood loss, there is not enough oxygen to be carried to the tissues and the patient will die. Both internal and external bleeding can lead to serious complications.

Multiple choice

Most of the CO2 in blood is carried

  1. as bicarbonate ion in the cytoplasm of red blood cells

  2. in gaseous form in red blood cells bound to haemoglobin.

  3. in gaseous form dissolved in the plasma

  4. as bicarbonate ion dissolved in plasma.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

CO2 is mainly transported in the form of bicarbonate by blood plasma.

Multiple choice

Mountaineers carry oxygen cylinders with them because____

  1. oxygen supports combustion.

  2. mountain air is very polluted.

  3. air becomes thinner as we go higher.

  4. air becomes denser as we go higher.

  5. there is no oxygen on the mountains.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The air gets thinner as we go higher up towards space. When mountaineers climb very high peaks, they face Oxygen shortage due to less dense air and due to the  efforts being put in climbing, the need of their body increases .

Multiple choice

Which of the following statements is/are correct?

a. Rapid breathing supplies more oxygen to body cells for producing more energy. b. Haemoglobin carries oxygen required for respiration. c. Haemoglobin has more affinity for carbon monoxide than oxygen.

  1. a, b and c

  2. a and b

  3. a and c

  4. b and c

  5. b only
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct answer as all statements are correct. Rapid breathing supplies more oxygen to body cells for producing more energy as required in sports etc. Haemoglobin carries oxygen required for respiration. Haemoglobin has more affinity for carbon monoxide than oxygen, which is why if carbon monoxide is inhaled by someone, then it binds very strongly with the haemoglobin in blood and prevents it from carrying oxygen to brain and other parts of the body and causes carbon monoxide poisoning.