Discussion
List of Sea water layers (List-I) and the density (List-II) are given below. Match the List-I and List-II and select the correct answer from the codes given below :
| List I | List II |
|---|---|
| (a) Photic layer | (i) Sharp density gradient |
| (b) Pycnocline layer | (ii) Highest density |
| (c) Deep/bottom layer | (iii) Lowest density. |
Answer: C
The correct matching is a-(iii), b-(i), c-(ii).
The photic layer at the surface is the warmest and is diluted by rain and rivers, so it has the lowest density. Below it, the pycnocline is the zone in which density increases sharply with depth, mainly because temperature falls quickly (the thermocline). The deep or bottom layer is cold and dense, so it has the highest density.
The other codes give the surface layer the sharp gradient or the highest density, or put the lowest density at the bottom, which would make the water column unstable.
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