Question

Deposition of calcareous shell around zygote is observed in:

• A. Quail and turtles
• B. Quails and sand sharks
• C. Turtles and Sand sharks
• D. Platypus and sting rays

Answer 1

The correct option is A Quail and turtles

Deposition of a calcareous shell around zygote resulting in the formation of eggs is the property of oviparous animals such as birds and reptiles. This offers protection and nourishment to the developing young ones. Quail and turtles are oviparous animals.

Most mammals except Platypus and Echidna exhibit viviparity where they give birth to their young ones. The young ones obtain nourishment from the mother through placental connection.

Ovoviviparous animals are intermediate between the viviparous and oviparous organisms. They produce eggs which remain inside the body of the parent till the young ones mature and are ready to hatch out. These eggs do not have a calcareous shell. After completing the development, the eggs hatch and the parent gives birth to the young ones. Sand turtles and stingrays are ovoviviparous.