How would Si depletion in the photic zone of the open ocean affect the biological pump and the C cycle?
What will be an ideal response?
Answer: Si is required for diatoms to fix carbon dioxide into organic carbon, thus Si depletion would reduce primary production. The biological pump is the sinking and sequestration of organic carbon into deep ocean water and sediments. Si depletion would slow down the biological pump and would reduce the amount of carbon dioxide removed from the atmosphere and stored in deep ocean water and sediments, resulting in increased atmospheric carbon dioxide.
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. Effective treatment of wastewater/sewage is reflected in a(n)
A. lower BOD. B. higher BOD. C. unchanging BOD. D. increase in sulfur.
You discover two species of sponge, one red and one blue, near a deep sea vent. You genetically engineer the red sponge to produce the same CAMs as the blue sponge. You then take each sponge - the blue sponge and the engineered sponge - dissociate their cells, and mix the red and blue cells together. Which of the following will you most likely observe?
A. one sponge with a red side and a blue side B. one blue sponge and one red sponge C. one sponge with blue cells and red cells randomly distributed D. a bunch of red and blue cells that stay dissociated E. one sponge with alternating red and blue layers of cells
A group of individuals of a single species that live together in the same place and time is referred to as a(n) ____
a. community b. biome c. population d. gene pool e. ecosystem
A graphic tool used to determine the probable outcome of genetic crosses is the
a. Mendelian box. b. Archimedian triangle. c. Euclid box. d. Hardy-Weinberg graph. e. Punnett square.