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Ananya Obaid Ganesh
Asked: 2022-11-05T12:39:49+05:30 In:

A desert lizard (an ectotherm) and a mouse (an endotherm) are placed inside a chamber at 15ºC and their body temperature [T(L) for the lizard and T(M) for the mouse] and metabolic rates [M(L) for the lizard and M(M) for the mouse] are monitored. Which one of the following is correct –

(A)  T(L) and M(L) will fall while T(M) and M(M) will increase

(B)  T(L) and M(L) will increase while T(M) and M(M) will fall

(C)  T(L) and M(L) will fall, T(M) will remain same and M(M) will increase

(D)  T(L) and M(L) will remain same and T(M) and M(M) will decrease 

A desert lizard (an ectotherm) and a mouse (an endotherm) are placed inside a chamber at 15ºC and their body temperature [T(L) for the lizard and T(M) for the mouse] and metabolic rates [M(L) for the lizard and M(M) for the mouse] are monitored. Which one of the following is correct –

(A)  T(L) and M(L) will fall while T(M) and M(M) will increase

(B)  T(L) and M(L) will increase while T(M) and M(M) will fall

(C)  T(L) and M(L) will fall, T(M) will remain same and M(M) will increase

(D)  T(L) and M(L) will remain same and T(M) and M(M) will decrease 

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1 Answer

  1. Correct option (C) T(L) and M(L) will fall, T(M) will remain same and M(M) will increase 

    Explanation:

    Desert lizard is an ectotherm (poikilotherm) whose body temperature varies according to environmental temperature.

    So at 15ºC T(L) will fall due to fall in T(M)

    While mouse is an endotherm (Homeotherm) whose body temperature remains constant always due to variation is metabolic rate

    In homeotherms metabolic rate is inversely proportional to environmental temperature. So at 15ºC T(M) remain same and M((M) will increased.  

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