Match the following in Column $I$ with the means adopted to tide over periods of unfavorable conditions in Column $II$.

$i$. Birds	$c$. Migration
$ii$. Seeds	$a$. Dormancy
$iii$. Snails	$d$. Aestivation
$iv$. Polar bear	$b$. Hibernation

Assertion : Biotic community has higher position than population in ecological hierarchy.
Reason : Population of similar individuals remains isolated in the community.

Invertebrates living in the deep sea, at extreme depths, experience pressure how many times greater than the normal atmospheric pressure (in $\times$)?

Identify $X$ in the given figure, which represents the biome distribution with respect to mean annual temperature and mean annual precipitation.

Consider the following four statements $(1-4)$ about certain desert animals such as kangaroo rat.
$(1)$ They have dark colour and high rate of reproduction and excrete solid urine.
$(2)$ They do not drink water,breathe at a slow rate to conserve water and have their body covered with thick hairs.
$(3)$ They feed on dry seeds and do not require drinking water.
$(4)$ They excrete very concentrated urine and do not use water to regulate body temperature.
Which two of the above statements for such animals are true?

Select the incorrect statement with respect to ecotypes.