A graph plots an organism's internal body temperature (y-axis) against external temperature (x-axis). Line P stays flat across the whole range. Line Q rises steadily as external temperature rises. Line R stays flat over a limited range and then rises with external temperature. Which identification is correct?
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Regulators, such as birds and mammals, keep a constant body temperature whatever the outside temperature. Conformers' body temperature changes with the surroundings, and partial regulators regulate only over a limited range, beyond which they conform.
- A.
A conformer's body temperature follows the outside, which is line Q, not P.
- B.
A regulator keeps a constant internal temperature over the whole range, which is line P.
- C.
A partial regulator holds steady only over a limited range, which is line R.
NCERT: Class 12 Biology, Chapter 11