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AP Intermediate 1st Year Breathing and Exchange of Gases — practice questions — page 2

Explore 50 free Breathing and Exchange of Gases questions in AP Intermediate 1st Year Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Breathing and Exchange of Gases questions and exercises with answers

Showing questions 31–50 of 50.

About 97 percent of oxygen in blood is carried by:Read the answer and worked solution →Haemoglobin is red because it contains:Read the answer and worked solution →Oxygen binds haemoglobin in the lungs and leaves it at the:Read the answer and worked solution →Every 100 mL of oxygenated blood delivers about ___ of oxygen to the tissues.Read the answer and worked solution →The enzyme in red cells that speeds up carbon dioxide and water turning into bicarbonate is:Read the answer and worked solution →Wheezing from inflamed bronchi and bronchioles is:Read the answer and worked solution →A stone-crusher works for years in dust and develops lung fibrosis. Such workers should wear:Read the answer and worked solution →Catch the lung breathersRead the answer and worked solution →Pop the air passage partsRead the answer and worked solution →Steer into the breathing laneRead the answer and worked solution →Slice the breathing wordsRead the answer and worked solution →Breathing in or outRead the answer and worked solution →How each gas travelsRead the answer and worked solution →Which is biggerRead the answer and worked solution →Breathing bingoRead the answer and worked solution →Earthworms exchange respiratory gases mainly through which structure?Read the answer and worked solution →Respiration using vascularised gills, as in most aquatic arthropods, is called what?Read the answer and worked solution →Frogs can respire through their moist skin. This is known as:Read the answer and worked solution →During swallowing, which flap covers the glottis to keep food out of the larynx?Read the answer and worked solution →Which cartilaginous part of the airway is called the sound box?Read the answer and worked solution →

Worked practice questions

About 97 percent of oxygen in blood is carried by:

  1. White cells
  2. Red blood cells
  3. Blood plasma
  4. Blood platelets
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Correct answer: B. Red blood cells

1. Only 3 percent dissolves in plasma. 2. The rest rides on haemoglobin. 3. Haemoglobin is inside red blood cells. _Source: syllabus Biology, Chapter 17, Breathing and Exchange of Gases._

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Haemoglobin is red because it contains:

  1. Zinc atoms
  2. Calcium ions
  3. Iron atoms
  4. Copper ions
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Correct answer: C. Iron atoms

1. Haemoglobin is a coloured pigment in RBCs. 2. Its colour comes from the metal it holds. 3. That metal is iron. _Source: syllabus Biology, Chapter 17, Breathing and Exchange of Gases._

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Oxygen binds haemoglobin in the lungs and leaves it at the:

  1. Alveoli
  2. Nostrils
  3. Bronchi
  4. Tissues
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Correct answer: D. Tissues

1. In the lungs oxygen pressure is high, so oxygen binds. 2. In tissues oxygen pressure is low and carbon dioxide is high. 3. So oxygen is released at the tissues. _Source: syllabus Biology, Chapter 17, Breathing and Exchange of Gases._

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