Q.Assertion: The best quality of pearl is known as lingha pearl and obtained from marine oysters.
Reason: Nacre is secreted continuously by the epithelial layer of the mantle and deposited around the foreign particle
a. Assertion is true, Reason is false
b. Assertion and Reason are false
c. Assertion is false But Reason is true
d. Assertion and Reason are true

Step 1. Check the Assertion: the chapter states that pearl beds on rock ridges and dead coral (inhabited by marine pearl oysters) produce the best-quality pearls, called 'Lingha Pearl', and separately confirms that marine oysters generally give better-quality pearls than freshwater bivalves — so the Assertion is true.

Step 2. Check the Reason: the chapter states directly that nacre is secreted continuously by the epithelial layer of the mantle and deposited around a foreign particle that has entered the shell — so the Reason is also true. …

Verify the Assertion and Reason separately against the chapter's pearl-formation and pearl-quality content, t …

• Assuming the Reason must be false simply because it describes general pearl formation rather than something Lingha-pearl-specific, when the quest …