123. From the table below, match the pellagic zones with their respective depths and choose the correct option:
1. I-x; II-w; III-y; IV-z
2. I-w; II-x; III-z; IV-y
3. I-z; II-y; III-x; IV-w
4. I-y; II-z; III-w; IV-x
What Are Pelagic Zones?
The pelagic zone refers to the open ocean, away from the coast and ocean floor. It is divided into several depth-based layers, each with unique environmental conditions and marine life. These zones are:
Major Pelagic Zones and Their Depths
| Pelagic Zone | Approximate Depth Range | Key Characteristics |
|---|---|---|
| Epipelagic (I) | 0 – 200 meters | Sunlit zone; supports photosynthesis |
| Mesopelagic (II) | 200 – 1000 meters | Twilight zone; very little light |
| Bathypelagic (III) | 1000 – 4000 meters | Dark zone; cold with high pressure |
| Abyssopelagic (IV) | 4000 – 6000 meters | Near freezing; very high pressure, no sunlight |
Matching Example
If the table in your question lists the zones as I, II, III, IV and the depths as w, x, y, z, then match them based on the above chart:
-
I → Epipelagic → 0–200 m
-
II → Mesopelagic → 200–1000 m
-
III → Bathypelagic → 1000–4000 m
-
IV → Abyssopelagic → 4000–6000 m
So, if the table shows:
-
w = 0–200 m
-
x = 200–1000 m
-
y = 1000–4000 m
-
z = 4000–6000 m
Then the correct match would be:
I-w; II-x; III-y; IV-z
So the correct answer is likely:
Option 2: I-w; II-x; III-y; IV-z
Conclusion
Understanding the pelagic zones helps in studying marine biology, ecological zoning, and oceanographic research. Each zone supports distinct forms of life and ecological processes, especially influenced by depth and light availability.
