A. One
B. Two
C. Three
D. Four

A. Primary roots show less a accessory and lateral canals
B. Primary roots resorb more easily
C. Primary roots are shorter
D. None of the above

A. Permanent second molar
B. Permanent first molar
C. Second premolar
D. Primary first molar

A. Wide and deep
B. Shallow and narrow
C. Wide and narrow
D. Shallow and wide

A. Less
B. Greater
C. The same
D. Not related

A. Same as permanent teeth
B. Inclined in an apical direction in the cervical third of crown
C. Inclined in an occlusal direction in the cervical third of crown
D. None of the above

A. 25 μm
B. 50μm
C. 75μm
D. 100μm

A. Four pulp horn and three root canal
B. Three pulp horn and three root canal
C. Two pulp horn and two root canal
D. Two pulp horn and three root canal

A. Slender mesiodistally
B. Slender anteroposteriorly
C. Bulkier mesiodistally
D. Buliker anteroposteriorly

A. Mandibular central incisor
B. Mandibular first molar
C. Maxillary central incisor
D. Maxillary second molar