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Terrarium
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NASA Why? Files segment explaining what a terrarium is and how it works.
Hey, Dr. D, look what I brought you.
00:00:00
Terrific.
00:00:02
Looks like you brought something from my terrarium.
00:00:03
Yeah.
00:00:05
Ranger Cortez from Sandy Bottom Park said you would like them.
00:00:06
Thank you.
00:00:08
My terrarium is coming along pretty good.
00:00:13
I'm being very careful to only put plants in that only require the same conditions.
00:00:15
Can you tell us more about how a terrarium works?
00:00:19
Sure.
00:00:21
My sealed terrarium must be self-sufficient.
00:00:22
The only thing that can come into the terrarium is light.
00:00:24
We already learned that light is the basic need of plants.
00:00:27
Water is recycled in a terrarium.
00:00:29
Plants give off water, which collects on the plastic,
00:00:31
runs down the side into the soil where it's collected by the roots and recycled.
00:00:33
Wow, that's pretty neat.
00:00:37
We already talked about how the plants basically just carbon dioxide.
00:00:39
Plants consume carbon dioxide and produce oxygen.
00:00:42
But what replaces the carbon dioxide so the plants don't die?
00:00:45
Well, animals breathe in oxygen and breathe out carbon dioxide,
00:00:49
but obviously there aren't any animals in there.
00:00:52
That's true, but there are decomposers in the soil like bacteria and fungi.
00:00:55
They also consume carbon dioxide and produce oxygen.
00:00:59
They also break down dead materials and produce the nutrients that the plants need.
00:01:03
It looks like everything gets recycled.
00:01:06
It turns out that plants use some oxygen to produce the energy they need
00:01:09
and give off carbon dioxide in the process.
00:01:12
This is called respiration.
00:01:14
Fortunately, plants produce much more oxygen than they consume.
00:01:16
I'm glad about that.
00:01:19
There's a lot going on in that terrarium.
00:01:20
It would be great if we could make our Mars habitat as self-sufficient as your terrarium.
00:01:22
Yeah, just add sunlight.
00:01:27
We've got to get going. We've got a lot of work to do.
00:01:29
Yeah.
00:01:32
Bye, Dr. D.
00:01:33
Bye.
00:01:34
- Valoración:
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- Idioma/s:
- Niveles educativos:
- ▼ Mostrar / ocultar niveles
- Nivel Intermedio
- Autor/es:
- NASA LaRC Office of Education
- Subido por:
- EducaMadrid
- Licencia:
- Reconocimiento - No comercial - Sin obra derivada
- Visualizaciones:
- 341
- Fecha:
- 28 de mayo de 2007 - 15:33
- Visibilidad:
- Público
- Enlace Relacionado:
- NASAs center for distance learning
- Duración:
- 01′ 38″
- Relación de aspecto:
- 4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
- Resolución:
- 480x360 píxeles
- Tamaño:
- 10.00 MBytes
