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NEET 2026
Exam
NEET
Year
2026
Subject
Zoology
Chapter
Breathing and Exchange of Gases

NEET 2026 · Zoology · Breathing and Exchange of Gases

Sponges exchange O _2 with CO _2 by __________.

Sponges exchange O2_2 with CO2_2 by __________.

Options

  1. Agills
  2. Bsimple diffusion over their entire body surfaces
  3. Cmoist cuticle
  4. Dtracheal tubes

Correct answer

B. simple diffusion over their entire body surfaces

Step-by-step solution

Sponges, coelenterates, and flatworms exchange O2O_2 with CO2CO_2 by simple diffusion over their entire body surfaces.

Gills are used by most aquatic arthropods and molluscs.

Earthworms use their moist cuticle for gas exchange.

Insects have a network of tubes called tracheal tubes to transport atmospheric air within the body.

Answer: simple diffusion over their entire body surfaces
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