Chapter:

Ecosystem

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