Alpine forests occur at altitudes of:

Based on the graph given below,identify the $INCORRECT$ statement.

Animals floating or swimming in the surface film of water are called:

Plants which produce characteristic pneumatophores and show vivipary belong to

$I.$ 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.

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