Question

How many of the following characteristics are common between reptiles and birds $?$
a. Four-chambered heart
b. Scales
c. Homoiothermous (warm-blooded)
d. Dioecious and internal fertilisation
e. Ovipary and direct development

• A. $2$
• B. $3$
• C. $5$
• D. $4$

Answer 1

The correct option is B $3$

Common characteristics shared by Reptiles and Birds

Reptiles and birds share three common characteristics like presence of scales on the body, dioecious and internal fertilisation, oviparity and direct development.
Reptiles have a three- chambered heart (exception: Crocodile), whereas, birds have four chambered heart. Scales are absent in the body of birds. Thus four-chambered heart and scales are not a common characteristics of reptiles and birds.