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  •  Aquatic primary production was measured using Light-and-Dark Bottle technique. If the initial oxygen concentration was I and the final oxygen concentration in the light bottle was L and that

 Aquatic primary production was measured using Light-and-Dark Bottle technique. If the initial oxygen concentration was I and the final oxygen concentration in the light bottle was L and that in the dark bottle D, the gross productivity (in terms of oxygen released) is given as

 

Option: 1

 L- I


Option: 2

 I - D


Option: 3

I- L


Option: 4

L - D


Answers (1)

best_answer

The gross productivity (P) in terms of oxygen released can be calculated using the Light-and-Dark Bottle technique as follows:

P = (L - D) - (I - D)

Where:

L is the final oxygen concentration in the light bottle (in mg/L).

D is the final oxygen concentration in the dark bottle (in mg/L).

I is the initial oxygen concentration (in mg/L).

The term (L - D) represents the net productivity, which is the difference in oxygen concentration between the light and dark bottles. The term (I - D) accounts for any oxygen consumed during the incubation period in both bottles.

By subtracting the oxygen consumed from the net productivity, we obtain the gross productivity, which represents the total oxygen released by photosynthesis.

Hence, the correct answer is option 4. 

Posted by

Rishabh

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