Which water depth had the biggest difference in survival rates tor embryos with
ID: 143296 • Letter: W
Question
Which water depth had the biggest difference in survival rates tor embryos with UV-B protection versus embryos without UV-B protection? O 100 cm 50 O 10 cm Submit Part B According to the graph the percent transmission of UV-B relative to light intensity at the waters surface O Decreases only below a certain threshold depth. O Decreases with increasing depth O Remains unchanged O Increases with increasing depth Submit PartC f the UV-B radiation at the surtace has an intensity of 0 27 wattsmi, approxomately what is the intensity at a depth of 100 cm? O 6.75 watts/m O 1.08 wattsm O 25 watts/m2Explanation / Answer
A. The biggest difference between the survival rates of UV-B protected and unprotected can be seen at the depth of 10 cm (see in the figure the lengths of yellow and brown bars differ the most at 10 cm)
B. Percent transcmission of UV-B relative to light intensity decreases with increasing depth (in the figure notice the blue curve, its a negative curve indicated that less UV-B reaches the depth of the water body. This is parallel to the survival rates too as at deepest point, survival rates of the embryo are higher and that there is little difference between the protected and the non protected ones)
C. At 100 cm, the percent transmission is about 25%, so if the intensity at the surface is 0.27, 25% of this 0.27 is reaching 100cm or 0.27*25 = 6.75watts/m2
D. Second option is correct "at shallow depthes, UV-B trnsmission is high and survival rates of unproteced embryos are low" (In the graph, at shallow depths i.e. at say about 10 cm, the curve of percent UV-B transmission marks about 80% (high transmission) and the yellow bar for unprotected embryos is low (low survival)
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