Question

Which among the following is the characteristic feature of birds?

• A. Nucleated RBC
• B. Presence of conus arteriosus in heart
• C. Sound producing organ, syrinx
• D. Homeothermal nature

Answer 1

The correct option is C Sound producing organ, syrinx

Nucleated RBC is present in various organisms like amphibians.
Conus arteriosus is present in right ventricle in the heart in the mammals.
Mammals are also homeotherms.
Syrinx is the name for the vocal organ of birds. Located at the base of a bird's trachea, it produces sounds without the vocal cords of mammals.
Thus, the correct answer is (C), Sound producing organ, syrinx.