¿Realmente comen tierra las lombrices?

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¿Realmente comen tierra las lombrices?

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CONVERSEMOS:

¿Cómo podrías averiguar si las lombrices son una plaga o si son buenas? ¿Qué evidencia necesitarías?

Paso
01/08
Obtén estos materiales. Obtendrás una lombriz más adelante.
Paso
02/08
Dobla o rompe tu toalla de papel para que quepa en medio
de tu plato.
Paso
03/08
Moja tu toalla de papel con una cucharada de agua.
Paso
04/08
Coloca tu pedazo de papel de construcción negro sobre el plato,
de esta forma. No lo presiones
Paso
05/08
Tomen turnos para ir a la Estación de Lombrices. Llevense su
plato. Desentierren una lombriz con cuidado y enjuaguenla con
agua. Pónganla sobre la toalla de papel.
Paso
06/08
La lombriz puede tardar varios minutos en empezar a moverse.
Cuando puedan, contesten las preguntas número uno y dos en
sus hojas de trabajo.
Paso
07/08
¿Su lombriz encontró un lugar donde descansar o esconderse?
Contesten la pregunta #3. Platiquen con las personas en su mesa
sobre lo que hicieron sus lombrices.
Paso
08/08
Conversemos. Luego ve el siguiente video.

CONVERSEMOS (1 de 2):

Darwin no dejó a todos convencidos. ¿Qué evidencia adicional apoyaría la afirmación de Darwin?

CONVERSEMOS (2 de 2):

¿Se te ocurren otras formas en las que las lombrices podrían ser buenas para un jardín aparte de que mezclan y separan el suelo?

CONVERSEMOS:

¿Crees que las lombrices comen tierra o que comen otras cosas?

Paso
01/15
Forma un equipo con algunos amigos y amigas. Cada uno de
ustedes hará su propio experimento, pero compartirán sus ideas.
Paso
02/15
Obtén estos materiales.
Paso
03/15
Observaste a las lombrices y viste que se arrastraron sobre o
debajo de la toalla de papel húmeda. Conversemos:
Paso
04a/15
Conversemos:
Paso
04b/15
Esta es nuestra idea. Queremos darle a la lombriz la oportunidad
de elegir entre una área húmeda y una área seca. Sabremos lo
que prefiere observando a dónde se va.
Paso
05/15
Escribe tu nombre cerca de la pregunta número uno. Luego pon
una toalla de papel seca sobre el plato y moja la mitad.
Paso
06/15
Vas a poner la lombriz en el medio de la toalla de papel. Luego,
la observarás durante un minuto lo qué hace la lombriz.
Paso
07/15
Agarra con cuidado la lombriz de tu último experimento y prepárate.
Cuando diga ¡fuera!, pondrás la lombriz en el medio de la toalla de
papel. En sus marcas, listos, ¡fuera!
Paso
08/15
Haz que todos en tu mesa digan a dónde se fue su lombriz. Escribe
estos resultados en el número 2, 3, y 4 de tu hoja de trabajo.
Paso
09/15
Conversemos:
Paso
10a/15
En este experimento, la lombriz se fue al lado seco. Mira la foto
de cómo hizo el experimento y conversemos.
Paso
10b/15
Esta no parece una prueba justa. Una prueba justa debería de poner
a prueba solo una cosa a la vez. Conversemos.
Paso
11/15
Las diferencias en la humedad y la luz afectan el comportamiento
de una lombriz. Conversemos y contesta la pregunta #5.
Paso
12a/15
Ahora te toca a tí diseñar un experimento. Platica sobre esta
pregunta y después contesta la pregunta número seis.
Paso
12b/15
Estás son varias preguntas que podrías responder con los
resultados de un experimento. Puedes quedarte con la pregunta
que a tí se te ocurrió o cambiarla por una de éstas.
Paso
13/15
Conversemos, y luego contesta la pregunta #8.
Paso
14/15
¿Qué puedes hacer para asegurarte que tu experimento sea una
prueba justa? Contesta la pregunta #9.
Paso
15/15
Te mostraremos el experimento que nosotros hicimos. Regresa
las lombrices a la Estación de lombrices, y luego ve el último video.
Slide Image
Slide Image

suelo


1 de 15

pedacitos de piedras y de otros materiales que cubren la superficie de la Tierra
Slide Image

nutriente


2 de 15

sustancia que un ser viviente necesita para crecer y mantenerse sano
Slide Image

fertilizante


3 de 15

un material que contiene nutrientes que ayudan a las plantas a crecer
Slide Image

organismo


4 de 15

cualquier ser vivo
Slide Image

descomponedor


5 de 15

un ser vivo que puede desintegrar a seres vivos muertos
Slide Image

humus de lombriz


6 de 15

desperdicio de lombriz (o popó de lombriz)

dióxido de carbono


7 de 15

un tipo de gas que las plantas ingieren y que los animales liberan al respirar
Slide Image

sistema


8 de 15

un conjunto de cosas que se afectan entre sí y funcionan juntas
Slide Image

observar


9 de 15

ponerle mucha atención a algo
Slide Image

afirmación


10 de 15

decir o escribir una idea
Slide Image

experimento


11 de 15

una prueba que se usa para descubrir más información sobre una pregunta
Slide Image

control


12 de 15

algo que no cambia en un experimento
Slide Image

variable


13 de 15

algo que se puede cambiar en un experimento para poner a prueba una idea
Slide Image

prueba justa


14 de 15

un experimento en el que se cambia solo una cosa y todo lo demás se queda igual
Slide Image

evidencia


15 de 15

información que puede ser usada para respaldar o rechazar una idea

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Exploration
Agriculture Helpers - earthworms on the ground by Image used under license from Shutterstock.com: DAMIAN Films
Peasant Woman Digging, the Jardin de Maubuisson, Pontiose by Camille Pissarro
Rainy Sidewalk by Vince Mig
Watering Can by Momentmal , used under CC0
caterpillar green tree by Image used under license from Shutterstock.com: Ikpro
common earthworm, Lumbricus terrestris, pulling leaves into tunnel in soil, ground, earth, UK by Image used under license from alamy.com: Papilio
drawing of woman and children in garden by Ernest Walbourn
earthworm in water on sidewalk by Carl Barrentine
football field by JSN Young , used under CC0
hands holding earthworms in soil by Image used under license from alamy.com: Rachel Husband
large green caterpillar eating leaf by Luke Gilliam , used under CC BY
person in running shoes walking, rear shot by Image used under license from Shutterstock.com: Kekyalyaynen
portrait of Charles Darwin by George Richmond
close earthworm photo by Image used under license from Shutterstock.com: kzww

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Lesson narration:

Activity Prep

Print Prep
In this lesson, students discover the critical role earthworms play in decomposing dead material and releasing nutrients into the soil. During a two-part activity, Ask a Worm, students observe earthworms and then design their own “fair test” investigations of earthworm behavior. Students first make close observations of worms. Then, students conduct a simple experiment with multiple trials to figure out if worms prefer dry or wet areas. They consider what a “fair test” is and design an experiment to answer other questions about worms.
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16 mins

Wrap-Up

4 mins

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Ecosystems Lesson 4: Do worms really eat dirt?

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