Rayat Shikshan Sansthas Swami Ramanand Vidyalay Jr College

Rayat Shikshan Sanstha’s Swami Ramanand Vidyalay & Jr. College, Ramanandnagar. Tal-Palus Dist-Sangli PPT Presented by Shri. Taralekar S. M. H. S. C. D. Ed.

th 7 Std. Sub- English

UNIT NO. 3 ACTIVITY NO : 3. 5 How Pearls Form

How Pearls Form

GEMSTONES Diamonds Rubies

Emeralds Sapphires

WE GET DIAMONDS AND OTHER GEMSTONES FROM ROCKS IN MINES.

PEARLS Oysters Oyesters are a kind of selfish. They live in water. An oyster has a soft body. It is protected by a shell made up of two parts held together by an elastic ligament.

INSIDE OF PEARL OYSTERS SHELL The inside of pearl oyster’s shell look smooth, shiny and beautiful. It is usually white with a tinge of other colours in it. This smooth, shiny substanceis called nacre or mother-ofpearl. this substance is produced by the oyster’s mantle- a skinlike organ.

BOTTOM OF OCEAN

PERSIAN GULF PEARL DIVERS.

KOKICHI MIKIMOTO JAPAN OYSTER -BED

ROUND AND DROP SHAPED PEARLS Irregular shaped Pearls

BLEMISHES OR FLAWS ON SURFACE OF PEARL

QUESTIONS Q. Write past forms of. 1) believe 2) add – 3) find 4) prepare – Q. Write plurals of. 1) pearl 2) ruby 3) oyster 4) mine – Q. Write describing words from page no. 94.

QUESTIONS Q. 1) Where do we get pearls form? Q. 2) Where do oysters live? Q. 3) How is oyster protected? Q. 4) What is mantles work? Q. 5) Where are pearl oyster found? Q. 6) Who devoleped a process for obtaining pearls?