Difference between revisions of "AY Honors/Shells - Advanced/Answer Key/es"

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|stage=00
 
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|honorname=Moluscos - Avanzado
 
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|skill=3
 
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|year=1949
 
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|category=Estudio de la naturaleza
 
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<!-- 3. Learn the classification terms of mollusks, know the distinguishing characteristics of each, and become acquainted with several species under each class. -->
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<!-- 3. Conocer los términos de la clasificación de los moluscos, conocer las características distintivas de cada uno y familiarizarse con varias especies de cada clase. -->
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There are ten classes of molluscs; eight of the classes have living representatives, the other two classes are known only from fossils. More than 250,000 species of mollusc are recognized and named. Snails (Gastropoda) account for about 80% of living mollusc diversity.
 
  
 
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<!-- 4 Distinguish between univalve and bivalve mollusks from the following considerations: -->
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<!-- 4 Distinguir entre moluscos unívalvos y bívalvos teniendo en cuenta las siguientes partes: -->
 
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<!-- 5. Identify from shells or drawings and know the meaning of the following concho logical terms: -->
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<!-- 5. Identificar a partir de conchas o dibujos y saber el significado de los siguientes términos lógicos de caracoles: -->
 
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<!-- 6. Explain the development of a shell. How long do mollusks live? -->
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<gallery perrow=3 widths=200>
 
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Image:Cypraea chinensis with partially extended mantle.jpg|The marine gastropod ''Cypraea chinensis'', the Chinese Cowry, showing partially extended mantle
 
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Image:Giant_clam_or_Tridacna_gigas.jpg|The giant clam (''Tridacna gigas'') is the largest extant bivalve
 
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Image:A fossil shell with calcite.jpg|Fossil shell covered in calcite crystals
 
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In those molluscs which have a shell, the shell grows gradually over the lifetime of the mollusc by the addition of calcium carbonate to the leading edge or opening, and thus the shell gradually becomes longer and wider, in an increasing spiral shape, to better accommodate the growing animal inside. The animal also thickens the shell as it grows, so that the shell stays proportionately strong for its size.
 
  
 
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<!-- 7. Give some facts about the life of a ''Strombus pugilis'' (fighting conch) and explain why this shell is so named. -->
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<!-- 7. Dar algunos datos sobre la vida de un caracol Strombus pugilis (conchas luchadora) y explicar la razón por la que éste molusco es llamado así. -->
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The West Indian Fighting Conch is an aggressive sea snail with a nasty sting which it uses to defend itself against marine predators.  These shells are best collected when the tide goes out, as great numbers of them suddenly emerge from the sand and retreat to the surf.  If one is flipped over, it can right itself using its sharp operculum.
 
  
 
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<!-- 8. Explain the activities of the shipworm. -->
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<!-- 8. Explicar las actividades del molusco broma. -->
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{{:Adventist Youth Honors Answer Book/Nature/Shipworm}}
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<!-- 9. What accounts for the distribution of mollusks. -->
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<!-- 9. ¿Cómo se explica la distribución de los moluscos? -->
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molluscs have few requirements in order for them to thrive.  They need moisture, but if they find themselves in a dry environment, they are able to seal themselves (and their moisture) inside their shells until external moisture becomes available again.  Thus, molluscs can be found in nearly every habitat on Earth - even deserts!
 
  
 
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<!-- 10. Name two mollusks that have no shells. -->
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<!-- 10. Nombrar dos moluscos que no tienen conchas. -->
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Image:Unknown slug on rhubarb.jpg|<center>Slug</center>
 
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Image:Octopus in sea life Helsinki.jpg|<center>Octopus</center>
 
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Image:Cuttlefish.jpg|<center>Cuttlefish</center>
 
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Image:Mastigoteuthis flammea.jpg|<center>Squid</center>
 
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<!-- 11. Find answers for the following interesting questions: -->
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<!-- 11. Encontrar respuestas a las siguientes preguntas interesantes: -->
 
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Many people find the very rounded, shiny, porcelain-like shells of '''cowries''' pleasing to look at and to handle. Shells of certain species have historically been used as currency in several parts of the world, as well as being used, in the past and present, very extensively in jewelry, and for other decorative and ceremonial purposes.
 
  
 
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Tibetan Buddhists make use of a particular set of eight auspicious symbols, ''ashtamangala'', in household and public art. The '''chank shell''' or '''conch''' is one of these eight symbols:
 
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# Conch
 
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# Banner
 
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When a mollusc is invaded by a parasite or is irritated by a foreign object that the animal cannot eject, a process known as encystation entombs the offending entity in successive, concentric layers of inner shell material, which in some cases is nacre. This process eventually forms what we call pearls and continues for as long as the mollusc lives. Almost any species of bivalve or gastropod is capable of producing "pearls", even molluscs which have no inner nacreous layer. However, only a few species, such as the famous pearl oysters, can create pearls which are highly prized.
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<!-- 12. Name six commercial uses for shells. -->
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;Musical Instruments: Key touches and various decorations on musical instruments such as saxophones, trumpets, violins, banjos, tamburitzas and guitars are sometimes made of mother of pearl. It is used as inlays on many guitar fretboards.
 
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;Clothing: Mother of pearl buttons can be found on a variety of clothing such as shirts, skirts and coats.
 
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;Decorative Inlays: Nacre is also used as a decorative feature of watch faces, knives, guns and jewelry.
 
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;Building Material: Instead of using a marble or tile base, the mother of pearl tesserae can be glued to a fiberglass mesh. The result is a lightweight material that offers a seamless installation, and there is no limit to the sheet size. Mother of pearl sheets may be used on interior floors, exterior and interior walls, countertops, doors and ceilings. Insertion into architectural elements, such as columns or furniture is easily accomplished.  Conch shells are occasionally used as a building material, either in place of bricks or as bulk for landfill.
 
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;Jewelry: Pearls are highly prized jewelry components.
 
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;Souvenirs: In some countries, cleaned Queen Conch (''Strombus gigas'') shells or polished fragments are sold, mainly to tourists, as souvenirs or in jewelry. Without a permit, however, export is a breach of CITES regulations and may lead to arrest. This is most likely to occur on return to the tourist's home country while clearing customs. In the UK conch shells are the ninth most seized import.
 
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;Pets: Snails are often kept in aquariums along with fish.
 
  
 
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<!-- 13. Do one of the following: <br>a. Personally find and collect 40 species of shells. List each shell as to the place and date it was found, common name, scientific name, and class. <br>b. Make a collection of 50 species of shells you have found, received, or purchased. List each shell collected as follows: if personally found, give the information called for under letter "a" above; if received or purchased, give the name of the person from whom the shell was received, the habitat of the shell, the date of its acquisition, and its common name, scientific name, and class. -->
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<!-- 13. Realizar una de las siguientes actividades:<br>a. Personalmente encontrar y recolectar 40 especies de conchas que representan a las cinco clasificaciones. Hacer una lista de cada molusco con el lugar y la fecha en que fue encontrado, nombre común, nombre científico y la clase.<br>b. Hacer una colección de 50 especies de conchas que ha encontrado, recibido o comprado que representen las cinco clasificaciones. Hacer una lista de cada concha recogida de la siguiente manera: si la encontró personalmente, dar la información solicitada en el punto «a»; si la recibió o compró, dar el nombre de la persona de quien recibió la concha, el hábitat de la concha, la fecha de su adquisición, su nombre común, nombre científico y la clase. -->
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The best approach here is to get a good field guide and then try to identify the shells you have found.
 
  
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The five classifications of seashells are:
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;Gastropoda: (snails, conches, etc.)
 
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;Cephalapoda: Such as ''Spirula spirula''.  Although the whole animal is rarely seen, the internal shell is very light and commonly floats ashore on beaches. The internal shell of this animal is known as the "ram's horn shell".
 
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;Bivalvia: (clams, mussels, etc.)
 
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;Polyplacophora: (chitons)
 
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;Scaphopoda: (tusk shells)
 
  
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If you opt to purchase your collection, one possibility is to start with a kit containing specimens from all five of these classes. [http://www.seashells.com Seashells.com] carries a such a kit, reasonably-priced.
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==References==
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==Referencias==
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* http://depts.washington.edu/natmap/mollusks/glossary.html
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[[Category:Adventist Youth Honors Answer Book/es]]
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* http://www.informaworld.com/smpp/content~content=a793157051~db=all~jumptype=rss
 
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* http://seachestsecret.questacon.edu.au/assets/Delve_Deep_-_Pearl_Oysters.pdf
 
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Latest revision as of 04:23, 9 September 2021

Other languages:
English • ‎español
Moluscos - Avanzado

Nivel de destreza

3

Año

1949

Version

01.06.2024

Autoridad de aprobación

Asociación General

Shells Advanced AY Honor.png
Moluscos - Avanzado
Estudio de la naturaleza
Nivel de destreza
123
Autoridad de aprobación
Asociación General
Año de introducción
1949


1

Tener la especialidad de Moluscos.


Para consejos e instrucciones, véase Moluscos.


2

Definir el término «moluscos».



3

Conocer los términos de la clasificación de los moluscos, conocer las características distintivas de cada uno y familiarizarse con varias especies de cada clase.



4

Distinguir entre moluscos unívalvos y bívalvos teniendo en cuenta las siguientes partes:


4a

Concha



4b

Cuerpo del molusco



4c

Reproducción



4d

Movimientos



4e

Asegurando la alimentación



4f

Auto-preservación




5

Identificar a partir de conchas o dibujos y saber el significado de los siguientes términos lógicos de caracoles:


5a

Valva



5b

Ápice



5c

Apertura, orificio



5d

Biso



5e

Pie



5f

Mantel, manto



5g

Opérculo



5h

Nácar



5i

Epidermis



5j

Costillas



5k

Los dientes



5l

Líneas concéntricas



5m

Canal



5n

Espinas



5o

Espira



5p

Labios




6

Explicar el desarrollo de una concha. ¿Cuánto tiempo viven los moluscos?



7

Dar algunos datos sobre la vida de un caracol Strombus pugilis (conchas luchadora) y explicar la razón por la que éste molusco es llamado así.



8

Explicar las actividades del molusco broma.


AY Honors/Shipworm/es


9

¿Cómo se explica la distribución de los moluscos?



10

Nombrar dos moluscos que no tienen conchas.



11

Encontrar respuestas a las siguientes preguntas interesantes:


11a

¿Cómo están unidos los bívalvos y unívalvos a sus conchas?



11b

¿Cómo es controlado el color del molusco?



11c

¿Qué molusco tiene cuatro branquias?



11d

¿De qué animal del mar fue hecha la tinta india?



11e

¿Qué molusco hace girar un hilo de seda?



11f

¿Qué conchas se utilizaban para el dinero de tribus antiguas?



11g

¿Qué concha se considera sagrado por los tibetanos?



11h

¿De qué molusco se obtenía la tinta púrpura en los tiempos antiguos?



11i

¿Cuál es la fuente de las perlas? ¿Cómo se forman?




12

Nombrar seis usos comerciales de las conchas (moluscos).



13

Realizar una de las siguientes actividades:
a. Personalmente encontrar y recolectar 40 especies de conchas que representan a las cinco clasificaciones. Hacer una lista de cada molusco con el lugar y la fecha en que fue encontrado, nombre común, nombre científico y la clase.
b. Hacer una colección de 50 especies de conchas que ha encontrado, recibido o comprado que representen las cinco clasificaciones.
Hacer una lista de cada concha recogida de la siguiente manera: si la encontró personalmente, dar la información solicitada en el punto «a»; si la recibió o compró, dar el nombre de la persona de quien recibió la concha, el hábitat de la concha, la fecha de su adquisición, su nombre común, nombre científico y la clase.




Referencias

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