BrahMos WORLD INDIA MADHYA PRADESH BHOPAL SPORTS BUSINESS FUN FACTS ENTERTAINMENT LIFESTYLE TRAVEL ART & LITERATURE SCIENCE & TECHNOLOGY HEALTH EDUCATION DIASPORA WTN SPECIAL OPINION & INTERVIEW GOSSIP CORNER RECIPES DRINKS BIG MEMSAAB 2017 BUDGET 2017 FUNNY VIDEOS VIRAL ON WEB PICTURE STORIES Mahakal Ke Darshan
ABOUT US PRIVACY POLICY SITEMAP CONTACT US
logo
Breaking News

ABOUT MOLLUSKS

Monday - March 26, 2018 10:03 am , Category : Fun Facts

The beautiful seashells collected by people the world over are actually protective coverings for a vast array of invertebrates known as mollusks.

A mollusk  is an animal covered in a thin layer of tissue called a mantle which produces a calcium carbonate shell. Mollusks occur in varied habitats , sea and land ,from ocean bottom to mountaintop.
Typical shelled Mollusks divide into four categories : bivalves, chitons, gastropods, and tusk shells .

Bivalves ,such as oysters, clams, and mussels  , have a two part hinged shell. Most burrow into sediment and some attach to a firm surface.
Chitons are oval in shape  and have an interlocking eight part upper shell. Most of a chiton’s body is a single, flatfoot that it uses to pull itself along and to cling to surfaces.

Gastropods  (which means “stomach feet”) . The largest Mollusks group, include snails, slugs and limpets. Most have a spiral shell but some such as   slugs have no exterior shell.

Tusk shells have a long tube like shell that is open at both ends. The larger end contains the foot, head and tentacles; The smaller end admits water to breathe and removes waste.

Octopuses, squid, cuttlefish and nautiluses, also Mollusks are called cephalopods (literally, head feet).

Among these animals ,only the nautilus has full shell the squid and cuttlefish have a shell remnant inside the body .the octopus has no shell at all.
Cephalopods are predators that also scavenge. They draw food into their mouths and crush it with their sharps, parrot like beaks. Cephalopods travel by means of jet propulsion. They squirt water from their bodies to move forward and back. the octopus deftly manipulates its eight suctioned tentacles to travel.

Read------->

WHAT IS CHEMOSYNTHESIS

Leave a Comment
* Name
* Email (will not be published)
*
* - Required fields
 

RELATED NEWS