4
Question
'Nacre' is mother layer of:
'Nacre' is mother layer of:
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Solution
The correct option is C Pearl formation
- Pearl is secreted by the mantle of the pearl oyster.
- Nacreous layer is the innermost layer of the shell and is better known as the mother of pearl.
- This layer is responsible for the formation of pearl. It consists of alternate layers of calcium carbonate and conchiolin, which lie parallel to the surface of the shell.
- Any sort of foreign body enters and gets between the mantle and shell, it becomes enclosed in a sac of mantle epithelium.
- This foreign body now acts as an irritant and stimulates the mantle epithelium to secrete concentric layers of nacre around this foreign body which hardens and forms the pearl.
- Thus, the correct answer is option B.
- Pearl is secreted by the mantle of the pearl oyster.
- Nacreous layer is the innermost layer of the shell and is better known as the mother of pearl.
- This layer is responsible for the formation of pearl. It consists of alternate layers of calcium carbonate and conchiolin, which lie parallel to the surface of the shell.
- Any sort of foreign body enters and gets between the mantle and shell, it becomes enclosed in a sac of mantle epithelium.
- This foreign body now acts as an irritant and stimulates the mantle epithelium to secrete concentric layers of nacre around this foreign body which hardens and forms the pearl.
- Thus, the correct answer is option B.
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