Instructions: Choose the phrase that best answers each question.
1. Examine Figures 1 and 2. Which division of the pelagic realm has insufficient light for photosynthesis and a rapid decrease in temperature?
A) Intertidal
B) Subtidal
C) Bathyal
D) Abyssal
E) Hadal
2. Examine Figure 3. Which of the following best describes conditions in the surface (photic) zone?
A) High in both nutrients and dissolved oxygen.
B) Low in both nutrients and dissolved oxygen.
C) High in nutrients and low in dissolved oxygen.
D) Low in nutrients and high in dissolved oxygen.
3. Examine Figure 4. At 10 meters depth, what percentage of incoming solar energy is available in turbid coastal water?
A) 30%
B) 20%
C) 10%
D) 5%
4. Examine Figure 5. This diagram shows that in polar latitudes (for example, the Siberian Sea), phytoplankton biomass is highest in
A) February-March
B) April-May
C) June-July
D) August-September
5. Examine Figure 8. This diagram shows that an organism living at Mean Sea Level would be exposed to air for what percentage of the tidal day?
A) 0%
B) 25%
C) 50%
D) 75%
E) 100%
1. Examine Figures 1 and 2. Which division of the pelagic realm do you think contains the most biomass (amount of living organisms)? Why did you choose this division?
2. Examine Figure 3. Look at the concentration of nutrients (nitrates, phosphates, and silicate---panels 2, 3, and 4) in the photic zone. Are there places in the ocean where the surface concentration of nutrients in the photic differs from that shown in this figure? (Hint: think about a physical process we talked about recently in class. This process operates along our coast.)
3. Examine Figure 5. Given the relationship shown in this figure, in which division of the ocean (from Figure 1) do you think zooplankton prefer to live? Keep in mind that zooplankton are very small animals that have limited mobility (that is, they need to be near their food source).
4. Examine Figures 5 and 6. Why do you think gray whales migrate to Alaska in the summertime?
5. Examine Figure 8. It is difficult for organisms to be exposed above the watery environment they prefer. Think of one possible adaptation that would help an organism retain moisture while it is out of water and exposed to air.