Q97 / 270 · NDA 2026 (Phase 1) · General Ability
In which of the following parts of organisms, the process of gaseous exchange during respiration does not take place?
- ASkin of earthworms
- Correct answerBBronchi of humans
- CGills of Pila
- DAlveoli of humans
Solution
The human respiratory system is divided into a conducting zone and a respiratory zone.
The conducting zone includes the external nostrils, nasal passage, pharynx, larynx, trachea, bronchi, bronchioles, and terminal bronchioles. This part transports air to the alveoli, clears it of foreign particles, humidifies it, and brings it to body temperature. Gaseous exchange does not occur in the conducting zone.
The respiratory zone consists of the alveoli and their ducts, which are the actual sites of gaseous exchange between blood and atmospheric air.
Earthworms respire through their moist skin, where gaseous exchange takes place.
Pila uses gills for aquatic respiration, which are sites of gaseous exchange.
Therefore, gaseous exchange does not take place in the bronchi of humans.
Answer: Bronchi of humans
The conducting zone includes the external nostrils, nasal passage, pharynx, larynx, trachea, bronchi, bronchioles, and terminal bronchioles. This part transports air to the alveoli, clears it of foreign particles, humidifies it, and brings it to body temperature. Gaseous exchange does not occur in the conducting zone.
The respiratory zone consists of the alveoli and their ducts, which are the actual sites of gaseous exchange between blood and atmospheric air.
Earthworms respire through their moist skin, where gaseous exchange takes place.
Pila uses gills for aquatic respiration, which are sites of gaseous exchange.
Therefore, gaseous exchange does not take place in the bronchi of humans.
Answer: Bronchi of humans
Hence, the correct answer is option: 'B'.