Question

Respiration in aquatic animals occurs by

(a) lungs (b) gills (c) nostrils (d) legs ​

Answer 1

Respiration in aquatic animals occur by gills.

Answer 2

Respiration in aquatic animals occurs by (b) gills.

• Aquatic animals live in water and thus obtain oxygen from water. Gills are the organs, which are branched and rich in blood vessels, which helps in gaseous exchange.
• Other respiratory organs in different types of animals are lungs in humans and animals, a trachea in mosquitoes etc.
• The absorbed oxygen is transported to different organs via blood. The deoxygenated blood from those organs carrying carbon dioxide releases it into the surrounding medium.