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Breathing and Exchange of Gases — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYBreathing and Exchange of Gases1 Mark
MCQ
Respiration in insects is called direct because:
  • A
    The cells exchange O2/ CO2 directly with the air in the tubes.
  • B
    The tissues exchange O2/ CO2 directly with coelomic fluid.
  • C
    The tissues exchange O2/ CO2 directly with the air outside through body surface.
  • D
    Tracheal tubes exchange O2/ CO2 directly with the haemocoel which then exchange with tissues.
✓

Answer

  1. The cells exchange O2/ CO2 directly with the air in the tubes.

Explanation:

Insects have a network of tubes (tracheal tubes) to transport atmospheric air within the body. These openings lead to trachae. The cells exchange O2/ CO2 directly with the air in the spiracles present on insects body.

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