Question

Respiratory organs like gills, book gills, book lungs or tracheal system are found in phylum:

• A. Arthropoda
• B. Aschelminthes
• C. Mollusca
• D. Chordata

Answer 1

Answer: (A)

The salient features of phylum Arthropoda are:

• They have an organ-system level of organization.
• They are bilaterally symmetrical, triploblastic, segmented, and coelomate animals.
• The body of arthropods is covered by a chitinous exoskeleton. The body consists of a head, thorax, and abdomen.
• They have jointed appendages (arthros-joint, poda-appendages).
• Respiratory organs are gills, book gills, book lungs, or tracheal system.
• The circulatory system is of open type.
• Sensory organs like antennae, eyes (compound and simple), statocysts, or balancing organs are present.
• Excretion takes place through malpighian tubules.