Question

In order to estimate the gross primary productivity (GPP) of a pond containing phy-

toplankton 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 ml−1

. The DO content when measured after 24 hours of incubation

was as follows:

Bottle X: 2 mg ml−1 after incubation in dark

Bottle Y: 18 mg ml−1 after incubation in light

What is the GPP of the pond? ​

Answer 1

Answer:

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