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

Give one example for each of the following:
$(i)$ Eurythermal plant species: $................$.
$(ii)$ $A$ hot water spring organism: $................$.
$(iii)$ An organism seen in deep ocean trenches: $................$.
$(iv)$ An organism seen in a compost pit: $................$.
$(v)$ $A$ parasitic angiosperm: $................$.
$(vi)$ $A$ stenothermal plant species: $................$.
$(vii)$ Soil organism: $................$.
$(viii)$ $A$ benthic animal: $................$.
$(ix)$ Antifreeze compound seen in Antarctic fish: $................$.
$(x)$ An organism which can conform: $................$.

Define/Explain: Ecological niche.

Match the types of niche in Column-$I$ with their description in Column-$II$.

$i$. Habitat niche	$a$. In the absence of competition in the habitat
$ii$. Trophic niche	$b$. Position of organism in the environmental gradient
$iii$. Multidimensional niche	$c$. Physical space occupied by an organism
$iv$. Fundamental niche	$d$. Level of organism in the food chain

The wide variety of natural habitats is based on which of the following?

Stenohaline fishes are represented by