Average temperature of thermal springs and deep sea hydrothermal vents exceeds (in $^{\circ} C$)

Deciduous forests are mainly found in regions where annual precipitation ranges between:

Define heliophytes and sciophytes. Name a plant from your locality that is either a heliophyte or a sciophyte.

Organisms that can tolerate and thrive in a wide range of temperatures are $P$,while those restricted to a narrow range of temperatures are $Q$. Choose the correct option for $P$ and $Q$.
$P \quad\quad Q$

$........$ is the most ecologically relevant environmental factor affecting the life of organisms.

Why are stenohaline organisms unable to survive in marine habitats for a long period?