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Environmental systems and societies paper 1 SL Spanish 2016...
Environmental_systems_and_societies_paper_1__SL_Spanish_2016_November.pdf
Showing 13-14 out of 16
Environmental systems and societies paper 1 SL Sp...
Environmental_systems_and_societies_paper_1__SL_Spanish_2016_November.pdf-Número de convocatoria del alumno N16/4/ENVSO/SP1/SPA/TZ0/XX
Environmental systems and societies...
Environmental_systems_and_societies_paper_1__SL_Spanish_2016_November.pdf-Número de convocatoria del alumno N16/4/ENVSO/SP1/SPA/TZ0/XX
Page 13
– 13 –
Véase al dorso
6.
Figura 6:
Efectos de la contaminación orgánica (aguas residuales sin tratar descargadas de
una tubería) en un ecosistema fluvial.
Algas
Microorganismos
0
50
100 150 200 250 300 350 400 450
Distancia desde el punto de descarga (m)
0
50
100 150 200 250 300 350 400 450
Distancia desde el punto de descarga (m)
0
50
100 150 200 250 300 350 400 450
Distancia desde el punto de descarga (m)
Demanda biológica
de oxígeno
Turbidez
Tamaño
poblacional
salida de tubería de
aguas residuales
Gráfica A
Gráfica B
Gráfica C
[Fuente: Dr. Mel Zimmerman, profesor de biología y director de Clean Water Institute en Lycoming College]
(Esta pregunta continúa en la página siguiente)
16EP13
N16/4/ENVSO/SP1/SPA/TZ0/XX
Page 14
– 14 –
(Pregunta 6: continuación)
(a)
Defina
demanda bioquímica de oxígeno (DBO)
.
[1]
..........................................................................
..........................................................................
..........................................................................
(b)
Resuma cómo varía la turbidez después del punto de descarga de aguas residuales
sin tratar en la
gráfica B
.
[2]
..........................................................................
..........................................................................
..........................................................................
..........................................................................
..........................................................................
..........................................................................
(c)
Sugiera qué aspecto tendría la curva de crecimiento de la población de algas en
la
gráfica C
si los contaminantes hubieran sido nitratos y fosfatos liberados por la
escorrentía de fertilizantes.
[3]
..........................................................................
..........................................................................
..........................................................................
..........................................................................
..........................................................................
..........................................................................
..........................................................................
..........................................................................
..........................................................................
..........................................................................
..........................................................................
(Esta pregunta continúa en la página siguiente)
16EP14
N16/4/ENVSO/SP1/SPA/TZ0/XX
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