Three species were studied in the field…
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Three species were studied in the field.
Species A lives where the temperature goes from to during the year. Species B lives only in a hot spring where the temperature is between and . Fish C was found in water of salinity from to parts per thousand. Fish D was found only in water of salinity to parts per thousand.
- Which species is eurythermal, and which is stenothermal?
- Which fish is euryhaline, and which is stenohaline?
- Which fish could be moved from a river to the sea with the least harm? Say why.
- NCERT names two kinds of place where the temperature goes above . Name them.
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The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) Species A bears of range, so it is eurythermal. Species B lives in of range, so it is stenothermal.
Step 2. (b) Fish C bears parts per thousand of range, so it is euryhaline. Fish D lives only in fresh water, so it is stenohaline.
Step 3. (c) Fish C. It can bear both the river and the sea. Fish D would have an osmotic problem in the sea.
Step 4. (d) Thermal springs and deep sea hydrothermal vents. The spring of species B is below , so it is one of the cooler ones.
Answer: (a) A eurythermal, B stenothermal; (b) C euryhaline, D stenohaline; (c) C; (d) thermal springs and deep sea hydrothermal vents.
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