Especialidades JA/Moluscos/Respuestas

Moluscos
Asociación General Estudio de la naturaleza	Destreza: 2 Año de introducción: 1938

Requisitos

1

¿Cuál es el significado del término «molusco»?

2

Identificar a partir de conchas o dibujos los siguientes:

2a

Manto

2b

Pie

2c

Dientes

2d

Costillas

2e

Válvula

2f

Margen dorsal

2g

Ápice

2h

Opérculo

2i

Canal

3

¿Se encuentran todos los moluscos en las playas? ¿En qué otro lugar se encuentran? ¿Qué áreas del mundo ofrecen la variedad más grande de conchas?

4

Describir el movimiento de los moluscos de un lugar a otro.

Mollusks have several methods of getting around, depending on the species. Some have tiny hair-like structures on the foot called cilia which they use to propel themselves through a slimy substance they secrete. Others generate waves of motion along the length of the foot. Still others pump water through their shells and let the resulting jet push them forward.

5

¿Cómo los moluscos se protegen a sí mismos?

Mollusks pull the soft portion of their bodies into their shells and seal the entry with their operculum. They can also burrow below the surface of the seafloor, river banks, river bottoms, or lake banks and lake bottoms.

6

¿Cómo están hechas las conchas de los moluscos y de qué materiales están hechas?

Shells are formed when the animal secretes calcium carbonate from the mantel. The calcium carbonate hardens into a shell. The apex of the shell is formed first, and as the animal grows, more is added to the shell at the opening.

7

Enumerar y explicar cinco formas en que son utilizadas las conchas por el hombre.

Shells are used to mark the frets on a guitar's fingerboard

Shells have been used by man in the following ways:

Money

Shells have been used in many cultures as a form of money.

Buttons

Buttons were originally cut from shells. Plastic buttons we use today still resembled the pearly surface of the inside of a seashell.

Adornment

Many cultures made (and make) jewelry from shells. Holes can be drilled into shells to make beads. Shells are also inlaid into wood in an artform called intarsia (also in marquetry and parquetry).

Hair combs

Shells have been cut to shape and used to comb hair.

Fret board markers

The markers (often round dots) between the frets on the fingerboard of a guitar (or other stringed instrument) are made of shell.

Utensils

Shells were used to make spoons, knives, cups, and dishes by primitive cultures.

Chemistry

Shells are made from calcium carbonate, a chemical useful in the laboratory. Calcium carbonate is widely used medicinally as an inexpensive dietary calcium supplement or antacid. It is also used in the pharmaceutical industry as a base material for tablets of other pharmaceuticals.

Lime

Seashells can be crushed to make lime which is used to raise the pH level in soil.

8

Explicar los términos «unívalvos» y «bívalvos» tal como se aplica a los moluscos.

Univalve (gastropod)

Bivalve

A bivalve is a mollusk with a two-part shell, such as an oyster, clam, scallop, or mussel. A univalve is a mollusk with a one-part shell, such as a snail, conch, or whelk.

9

Dar el nombre común de cinco diferentes clases de conchas y nombrar de su propia colección un molusco de cada clase.

Bivalves

An assortment of bivalves

Bivalves typically have two-part shells, with both valves being symmetrical along the hinge line. The class has 30,000 species, including scallops, clams, oysters and mussels.

10

Hacer una colección de 20 diferentes conchas, clasificarlos y mencionar dónde fue encontrada cada una y cuándo llegó a su posesión.

You can collect shells on beaches or buy them at craft stores. If buying them, it is cheaper to buy a variety pack rather than getting them individually. Once you have 20 different types of shells, you can begin the process of identifying them. For this you will need a field guide such as one of these:

11

¿Cuál es la fuente de perlas? ¿Qué lecciones espirituales nos enseñan las perlas? Leer y discutir de Palabras de Vida del Gran Maestro de Elena G. de White, páginas 82 a 92.

Source of Pearls

A pearl is a hard, rounded object produced within the soft tissue (specifically the mantle) of a living shelled mollusk. The finest quality pearls have been highly valued as gemstones and objects of beauty for many centuries, and the word pearl has become a metaphor for something rare, fine, and admirable.

Comentarios de Elena de White

El libro de Elena de White, Palabras de vida del gran Maeastro, se puede leer por internet. Las páginas requeridas aquí se puede encontrar en el capítulo 9.

12

Empareje los textos bíblicos que mejor respondan A-J:

Levítico 11:9 y 10	a. ¿En qué día fueron creadas las criaturas acuáticas?
Hechos 16:14	b. El número de criaturas acuáticas es innumerable.
Isaías 50:2	c. Criaturas acuáticas perecen fuera del agua.
Apocalipsis 21:21	d. Job consideró el coral de gran valor.
1 Timoteo 2:9	e. Salomón estaba familiarizado con la vida marina.
Génesis 1:20 y 21	f. Jesús utiliza 2 veces una concha para enseñar una lección espiritual.
1 Reyes 4:33	g. Una empresaria se dedicaba a la venta de los famosos tintes de púrpura garantizados, tomado de los mariscos del Mediterráneo llamado Murex.
Salmo 104:25	h. Pablo no apoya el uso de perlas.
Mateo 7:6; 13:45 y 46	i. Los moluscos son impropios para la alimentación.
Job 28:18	j. Las 12 puertas de la Santa Ciudad son 12 perlas.

i. Shell creatures are unfit for food.

" 'Of all the creatures living in the water of the seas and the streams, you may eat any that have fins and scales. But all creatures in the seas or streams that do not have fins and scales—whether among all the swarming things or among all the other living creatures in the water—you are to detest. Leviticus 11:9,10

j. The twelve gates of Holy City are twelve pearls.

The twelve gates were twelve pearls, each gate made of a single pearl. The great street of the city was of pure gold, like transparent glass. Revelation 21:21