Many tribes live in the high altitude of the Himalayas. What physiological adaptation do they exhibit?

Which feature of an elephant suggests that it is an animal of a hot climate?

$I.$ 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.

$I.$ Many xerophytic plants have thick cuticle on leaf epidermis and sunken stomata.
$II.$ Some xerophytic plants have a special photosynthetic pathway $(CAM)$ that enables their stomata to close during the day.
$III.$ $Opuntia$ has spines (modified leaves) and a photosynthetic phylloclade (stem).
$IV.$ All adaptations are genetically fixed in all organisms.
Choose the combination of correct statements.

Annual migration does not occur in the case of ............ .

Match the columns:

Column-$I$	Column-$II$
$(a)$ Bears	$(i)$ Diapause
$(b)$ Snails	$(ii)$ Hibernation
$(c)$ Zooplanktons	$(iii)$ Dormancy
$(d)$ Seeds	$(iv)$ Aestivation