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Which one is correct? I. In a hot cl...

Which one is correct?
I. In a hot climate reptiles can maintain a constant body temperature in the day by behavioural regulation.
ll. The body temperature of thermoconformers changes with ambient temperature.
III. In aquatic osmoconformers, the osmolarity of body fluids changes with that of ambient water.
IV. Small animals have a larger surface area relative to their volume, therefore tend to lose body heat very fast when it is cold outside, then they have to expend much energy to generate body heat through metabolism.

A

All

B

None

C

Only IV

D

I, II, III

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statements are correct regarding organisms and their physiological adaptations, let's analyze each statement step by step. ### Step-by-Step Solution: 1. **Statement I**: "In a hot climate, reptiles can maintain a constant body temperature in the day by behavioural regulation." - Reptiles are ectothermic animals, meaning they rely on external sources of heat to regulate their body temperature. In hot climates, they can indeed maintain a more constant body temperature by behavioral adaptations such as seeking shade or burrowing underground to avoid excessive heat. - **Conclusion**: This statement is **correct**. 2. **Statement II**: "The body temperature of thermoconformers changes with ambient temperature." - Thermoconformers are organisms that do not regulate their internal body temperature and instead allow it to fluctuate with the ambient temperature. This is typical of many marine organisms. - **Conclusion**: This statement is **correct**. 3. **Statement III**: "In aquatic osmoconformers, the osmolarity of body fluids changes with that of ambient water." - Osmoconformers are organisms that maintain an osmotic balance with their environment. In aquatic environments, their body fluids will indeed change osmolarity to match that of the surrounding water. - **Conclusion**: This statement is **correct**. 4. **Statement IV**: "Small animals have a larger surface area relative to their volume, therefore tend to lose body heat very fast when it is cold outside, then they have to expend much energy to generate body heat through metabolism." - Smaller animals have a higher surface area-to-volume ratio, which leads to faster heat loss in cold environments. To compensate for this heat loss, they must increase their metabolic rate to generate sufficient body heat. - **Conclusion**: This statement is **correct**. ### Final Conclusion: All four statements (I, II, III, and IV) are correct. Therefore, the answer to the question is that all statements are correct. ---
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