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(B) These variants are called ecophenes (or ecads). Ecophenes are morphological variations within a species that are induced by environmental factors

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Ecophenes

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(B) These variants are called ecophenes (or ecads). Ecophenes are morphological variations within a species that are induced by environmental factors rather than genetic differences. When these variants are grown under uniform environmental conditions,the morphological differences disappear,confirming that they are not genetically distinct. This phenomenon is a classic example of phenotypic plasticity,where the same genotype produces different phenotypes in response to different environmental conditions such as altitude,temperature,or soil $pH$.

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

Column $I$	Column $II$
$i$. Thick cuticle on leaf surface	$a$. Desert lizards
$ii$. Leaves reduced to spines	$b$. Archaebacteria
$iii$. Burrow into sand to escape from heat	$c$. Desert plants
$iv$. Hot springs	$d$. Opuntia

$A$ plant species shows several morphological variations in response to altitudinal gradient. When grown under similar conditions of growth,the morphological variations disappear and all the variants have common morphology. What are these variants called?

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Which of the following are the dominant plants of the cold desert?

How can seals survive in a polar climate where the temperature prevails below $0^{\circ} C$?

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

Despite variations in external environment,organisms try to maintain constancy of its internal environment which is called . . . . . . .

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