Herbicides and Photosynthesis

These flashcards cover key concepts related to herbicides, their effects on photosynthesis, and the processes of photophosphorylation.

What do triazines do in photosynthesis?

Triazines bind to Phaeophyton, preventing it from accepting an electron from p680 (PSII).

What is the effect of Paraquat on PSI?

Paraquat blocks the ability of PSI (p700) to donate electrons to ferredoxin.

Which herbicides block cyclic and non-cyclic photophosphorylation?

Heparin, DCMU, and Triazines block both cyclic and non-cyclic photophosphorylation.

Which herbicide alone blocks NADPH production?

Heparin only blocks NADPH production.

Which herbicides affect ATP production?

Heparin, DCMU, and Triazines affect ATP production.

Do all living plant cells contain functional chloroplasts?

No, only some living plant cells contain functional chloroplasts.

What reaction does ATP synthase catalyze?

ATP synthase catalyzes the reaction: ADP + phosphate → ATP.

What powers the ATP synthesis in thylakoid membranes?

The electrochemical gradient of H+ generated by the electron transport chain powers ATP synthesis.

What happens during cyclic photophosphorylation?

ATP is produced; neither NADPH nor O2 are produced.

What is produced during non-cyclic photophosphorylation?

ATP, NADPH, and O2 are all produced.