What proportion of total solar radiation is received as $PAR$ (Photosynthetically Active Radiation)?

  • A
    Approximately $70\%$
  • B
    Approximately $60\%$
  • C
    Less than $50\%$
  • D
    More than $80\%$

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The second trophic level in a pond ecosystem is ..........

Of the total incident solar radiation,the proportion of $PAR$ is:

Which nutrient cycle is a sedimentary cycle?

In a given ecosystem,the number of individuals in a species remains more or less constant over a period of time. The constancy of this number is maintained by:

$A$: Stratification helps in the accommodation of a large number and types of plants in the same area.
$R$: It is the occurrence of horizontal zonation in the ecosystem.

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