In lower organisms,the formation of thick-walled spores helps them to survive in unfavorable conditions. What is this process called?

Which of the following are the dominant plants of the cold desert?

Planktons are organisms which:

Which of the following organisms can ensure constant body temperature and osmotic concentration by physiological and behavioural changes?

Which one of the following is $NOT$ a characteristic of a habitat?

$I.$ Biochemical adaptations are seen in organisms living at great depths of the ocean to face crushing pressure.
$II.$ Allen's rule explains adaptations in mammals living in colder climates.
$III.$ Altitude sickness is caused because the body does not get enough oxygen due to low atmospheric pressure at high altitudes.
$IV.$ Desert lizards lack behavioural means to manage their body temperature.
Choose the correct option for the above statements.