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BS-MS (IISc/IISER) — free MCQ practice

Choose from 30 questions across 1 subjects and 3 topics. Open any question for its answer and worked solution, or keep learning through bite-sized lessons and reviews with Quill.

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BS-MS (IISc/IISER) subjects

Biology (30)

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BiologyMedical EntranceRespiration and Gas Exchange

Try a BS-MS (IISc/IISER) question

A biologist lists the main parts of the human breathing system: nasal cavity, lungs and:Read the answer and worked solution →As an animal gets bigger, its ratio of surface area to volume:Read the answer and worked solution →Direct diffusion through the body surface works only for organisms smaller than about:Read the answer and worked solution →A flatworm breathes through its outer membrane. Its flat shape helps by raising the:Read the answer and worked solution →

Worked practice questions

A biologist lists the main parts of the human breathing system: nasal cavity, lungs and:

  1. Trachea
  2. Thalamus
  3. Thymus
  4. Tendon
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Correct answer: A. Trachea

1. Air must travel from nose to lungs. 2. One tube carries it down. 3. That tube is the trachea. _Source: OpenStax Biology 2e, Chapter 39, The Respiratory System._

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As an animal gets bigger, its ratio of surface area to volume:

  1. Dazzles
  2. Drops
  3. Doubles
  4. Dawdles
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Correct answer: B. Drops

1. Volume grows faster than surface. 2. So the ratio between them falls. 3. It drops as size increases. _Source: OpenStax Biology 2e, Chapter 39, The Respiratory System._

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Direct diffusion through the body surface works only for organisms smaller than about:

  1. 1 mm
  2. 1 m
  3. 1 km
  4. 1 dm
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Correct answer: A. 1 mm

1. Diffusion is slow over distance. 2. Only very tiny bodies can rely on it. 3. The limit is about 1 mm. _Source: OpenStax Biology 2e, Chapter 39, The Respiratory System._

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