Mollusks Flashcard

Front

What do mollusks use as their skeleton?

Back

External shells

Answer explanation

Mollusks use external shells as their skeleton. These shells provide protection and support, distinguishing them from animals with internal bones, feathers, or scales.

Front

What are the smooth, shiny layers on mollusk shells called?

Back

Mother-of-pearl

Answer explanation

The smooth, shiny layers on mollusk shells are called mother-of-pearl, also known as nacre. This iridescent material forms the inner layer of the shell and is responsible for its luster.

Front

What are mollusks with one shell called?

Back

Univalves

Answer explanation

Mollusks with one shell are called univalves. This term specifically refers to organisms like snails and slugs, distinguishing them from bivalves, which have two shells.

Front

What are mollusks with two shells called?

Back

Bivalves

Answer explanation

Mollusks with two shells are called bivalves. They include clams, oysters, and mussels, which have a hinged shell divided into two parts, unlike univalves that have a single shell.

Front

How do bivalves eat?

Back

By opening their shells and letting water pass through

Answer explanation

Bivalves eat by opening their shells and filtering water through their gills, which trap food particles like plankton. This method allows them to efficiently obtain nutrients from the water.

Front

What is formed when a mollusk coats a piece of grit with mother-of-pearl?

Back

A pearl

Answer explanation

When a mollusk coats a piece of grit with mother-of-pearl, it forms a pearl. This process occurs as the mollusk secretes layers of nacre around the irritant, resulting in the creation of a pearl.

Front

Which type of mollusk pearls are considered the most beautiful?

Back

Oyster pearls

Answer explanation

Oyster pearls are considered the most beautiful due to their luster, shape, and variety of colors. They are produced by oysters, particularly the Pinctada species, which are renowned for creating high-quality pearls.

Front

Where can mollusks be found?

Back

In oceans, rivers, and on land

Answer explanation

Mollusks are diverse and can inhabit various environments, including oceans, rivers, and land. This adaptability allows them to thrive in multiple ecosystems, making "In oceans, rivers, and on land" the correct choice.

Front

What do the layers of a mollusk's shell resemble?

Back

Shingles on a roof

Answer explanation

The layers of a mollusk's shell resemble shingles on a roof because they are arranged in overlapping layers, similar to how roof shingles are placed to provide protection and structure.

Front

What is the main topic of the passage?

Back

Mollusks and their shells

Answer explanation

The passage primarily discusses mollusks and their shells, making this the main topic. The other options, such as types of fish, birds, and insects, are not relevant to the content of the passage.