Cockroach - Circulatory And Respiratory System
How is oxygen primarily delivered to the body tissues of the cockroach Periplaneta during respiration?
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About This Question
- Subject
- biology
- Chapter
- structural organisation in animals and plants
- Topic
- cockroach - circulatory and respiratory system
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Directly through a network of tracheal tubes
Respiration strategies vary with body organisation, and NCERT explains that the cockroach has an open circulatory system in which the colourless haemolymph lacks respiratory pigments. Because the blood does not transport oxygen, gas exchange is carried out by a separate tracheal system: air enters through ten pairs of spiracles and travels through branching tracheae and fine tracheoles that deliver oxygen directly to the tissues and cells. This direct air-tube delivery is the defining respiratory feature of insects. Blood pigments in haemolymph cannot be the answer because cockroach haemolymph is pigment-free and plays no oxygen-carrying role. Gills connected to the heart belong to aquatic animals such as fish and prawns, not to a terrestrial insect. Cutaneous diffusion across moist skin is used by animals like the earthworm and frog, not by the cockroach whose cuticle is dry and impermeable. As stated in NCERT Class 11, Chapter 7 (Structural Organisation in Animals), the tracheal system handles respiration in the cockroach. A logical check confirms that oxygen delivery independent of blood matches only the tracheal pathway.
This medium difficulty biology question is from the chapter structural organisation in animals and plants, covering the topic of cockroach - circulatory and respiratory system. It appeared in the 2025 exam.
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