In which one of the following habitats does the diurnal temperature of the soil surface vary the most?

Most dominant direct factor which influences the growth of plants is

Given below are five statements.
$A.$ Organisms living in oceans,lakes,and rivers also face water-related problems.
$B.$ Euryhaline can tolerate a wide range of salinities.
$C.$ Stenohaline are restricted to a narrow range of salinities.
$D.$ Many freshwater animals cannot live for long in sea water because of the osmotic problems they would face.
$E.$ The salt concentration (measured as salinity in parts per thousand) is less than $5$ in inland waters,$30-35$ in the sea,and $>100$ in some hypersaline lagoons.

$A$ xeric environment is characterized by:

Which of the following is the most ecologically relevant environmental factor?

The photic or euphotic zone extends to what depth from the upper surface of the sea?