41. Which of the following is not an ecto-mesenchymal derivative ?
A. Dentin
B. Cementum
C. Pulp
D. Enamel
✅ The correct answer is option D. Enamel.
Oral Histology
42. Among the following the structure that is most calcified is_______________?
A. Enamel lamella
B. Enamel rod
C. Enamel spindle
D. Enamel tuft
✅ The correct answer is option B. Enamel rod.
43. Shape of crown and the size of the roots is determined by______________?
A. Pulp
B. Dentin
C. Enamel
D. Cementum
✅ The correct answer is option B. Dentin.
44. Which of the following groups of fibres are not attached to alveolar bone ?
A. Transseptal
B. Horizontal
C. Oblique
D. Apical
✅ The correct answer is option A. Transseptal.
45. The calcified mass found in the PDL are_____________?
A. Cementicles
B. Osteoblasts
C. Cementoclasts
D. Osteoclasts
✅ The correct answer is option A. Cementicles.
46. Color of the normal gingiva is_____________?
A. Pink
B. Red
C. Coral pink
D. None of the above
✅ The correct answer is option C. Coral pink.
47. calcification in enamel starts at____________?
A. Enamel matrix
B. Root
C. CEJ
D. DEJ
✅ The correct answer is option D. DEJ.
48. Following is not an external manifestation of enamel________________?
A. Enamel tufts
B. Enamel lamella
C. Incremental lines of enamel
D. Enamel cuticle
✅ The correct answer is option A. Enamel tufts.
49. True about osteoclasts_____________?
A. Monocytes are precursor cells of osteoclasts
B. The plasma membrane of osteoclasts adjacent to bone that is being resorbed is known as striated or ruffled border
C. Contain lysosomes with acid phosphates
D. All of the above are true
✅ The correct answer is option D. All of the above are true.
50. In considering the process of eruption, the pre-functional eruptive stage of a tooth begins when the_____________?
A. Bud stage begins
B. Cap stage begins
C. Bell stage begins
D. Dental lamina begins forming
✅ The correct answer is option D. Dental lamina begins forming.