Presence of plants arranged into well defined vertical layers depending on their height can be seen best in
tropical rainforest
grassland
temperate forest
tropical savannah.
(a)
$A$ : Different ecotypes of a species despite being genotypically different are interfertile. $R$ : They are locally natural selections from a pool of genetic variations found in gene pool of a species.
Ectothermic animals are also called
Plants are killed in winter by frost
Submerged hydrophytes show
Maximum contribution of $O_2$ is from
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