Q. Consider the following statements:

1. Almost all birds and mammals are capable of thermoregulation and osmoregulation.
2. Nearly all plants cannot maintain a constant internal environment.
3. Aquatic animals and mostly all plants are conformers.

Which of the above statements is / are correct?
Answer: Only 1 and 3
Notes: Birds and mammals are capable of physiological regulation for temperature and osmosis, while a vast majority of animals and nearly all plants cannot maintain internal constancy, making them conformers. Statement 1 and 3 are therefore correct. Statement 2 is incorrect because although most, but not nearly all, plants lack homeostasis mechanisms for maintaining a constant internal environment.