Question

: Lower jaw is composed of _____ in rabbit
(a)Dentary
(b)Maxilla
(c)Premaxilla
(d)Palatine

Answer 1

Hint: The lower jaw of a rabbit is the anterior bone of the lower jaw which holds the teeth. Additionally, in mammals, it forms the entire lower jaw.

Complete answer:
The teeth have a mesodermal origin. Only the ectoderm or Epidermis (Enamel part) derives part of the tooth present outside the gums. The human teeth of the upper jaw are attached to the Maxilla bone whereas, the teeth of the lower jaw are attached to the mandible. In the rabbits, the upper incisors are attached to the premaxilla, and the upper premolars, molars are attached to the maxilla bone. The lower teeth of the rabbit are attached to the dentary bone. Dentary consists of the lower jaw.
The mandible of a vertebrate or homologous bone that contains teeth in the lower jaw of ancestral and related species is called dentary.

Additional Information: Rabbits have 28 teeth that have four incisors, two at the top and two at the bottom. Two small peg-like teeth, called auxiliary incisors or "peg teeth" are right behind the top incisor teeth. Furthermore, rabbits have cheek teeth which they use to grind their food. These are the six upper premolars, the four lower premolars, the six upper molars, and the six lower molars. The main function of the peg teeth is to grab and bite the food.

So, the correct answer is ‘Dentary’.

Note: The rabbit’s teeth keep on growing throughout its lifetime and this property is very important for its survival. In the wild areas, rabbits being an herbivorous animal will feed on various plant parts. Sometimes it consumes hard vegetarian foods like tree bark, twigs that will need lots of chewing, and due to which their teeth become worn out. Thus, its teeth grow three to five inches annually.