In order to estimate the gross primary productivity (GPP) of a pond containing phytoplankton and zooplankton, a student collected water samples from the pond in two bottles labelled X and Y. The dissolved oxygen (DO) of the samples immediately after collection was $8$ mg $m l^{- 1}$ . The DO content when measured after $24$ hours of incubation was as follows:
Bottle X: $2$ mg $m l^{- 1}$ after incubation in dark
Bottle Y: $18$ mg $m l^{- 1}$ after incubation in light
GPP of the pond is?

Question

In order to estimate the gross primary productivity (GPP) of a pond containing phytoplankton and zooplankton, a student collected water samples from the pond in two bottles labelled X and Y. The dissolved oxygen (DO) of the samples immediately after collection was

8

mg

m l^{- 1}

. The DO content when measured after

24

hours of incubation was as follows:
Bottle X:

2

mg

m l^{- 1}

after incubation in dark
Bottle Y:

18

mg

m l^{- 1}

after incubation in light
GPP of the pond is?

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