You need to find out why the GBR water is inhibiting (stopping) photosynthesis in the algae. The three major parts of photosynthesis are PSI, PSII and the Calvin cycle. The database has provided 3 things that could be inhibiting photosynthesis: high sea temperatures, paraquat, and diuron.

Justify your choice by writing a hypothesis to explain how it has stopped the algae from making ATP, NADPH and sugars. You will be able to revise your hypothesis as you do more experiments.

Increasing the temperature only decreases the sugar, not the ATP and NADPH. I predict that Diuron will be inhibiting photosynthesis because photosynthesis as a whole should not work if Photosystem II is interfered with. Also, because Paraquat only lowers NADPH and sugar and not ATP, Diuron is the only choice left.

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ahsan57900 ahsan57900 · Answer 2 · 2021-08-14T13:35:09+02:00

Diuron and paraquat inhibit photosynthesis as well as ATP production whereas high temperature decreases the ATP production not stop it.

Diuron is the chemical that inhibits the photosynthesis BY stopping photosystem 2 from sending electrons to the electron transport chain. If there is no electron so there will be no hydrogen ions which is needed to make ATP . At high sea temperatures, the activity of photosynthesis decreases not stopped because high temperature affect enzymes. Paraquat also inhibits the production ATP in algae by disrupting electron transport chain which is important stage for the production of ATP molecules.

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