Photosynthesis

ATP is made during the light reaction using all of the following EXCEPT

• proton pump

• hydrogen ion gradient

• electron energy from photosystem II

• NADPH donating electrons

Plants use the following reactants for the light reaction

• Water and CO2

• Water and NADPH

• Water and NADP+

• NADPH and ATP

Rubisco is important in which step of photosynthesis

• energizing the electrons in chlorophyll

• carbon fixation when CO2 is connected to RUBP during calvin cycle

• regeneration phase as RUBP is made during calvin cycle

• reduction of the carbon chain during the calvin cycle

If the proton (H+) pump in the thylakoid was not working which molecule could not be made during the light reaction?

• NADPH

• ATP

• Water

• Oxygen gas

The NADP+ is

• oxidized during the light reaction

• reduced during the light reaction

• oxidized during the Calvin cycle

• reduced during the Calvin cycle

Which of the following would have the least affect on photosynthetic rate?

• increase the temp from 20 C to 30 C

• increasing the CO2 from 400 ppm to 600ppm

• increasing the light intesity from 40 Watts to 60 Watts

• increasing the amount of O2 from 20% to 30% in the air

What is FALSE about the calvin cycle

• uses the light reactions products

• produces a three carbon sugar (G3P)

• produces carbon dioxide

• produces NADP+

During noncyclic photophosphorylation all of the following occur EXCEPT

• ATP is made using electron energy that will leave on NADPH

• results in oxygen gas being produced

• water is split (photolysis)

• electrons from photosystem 1 return back to photosystem 1

Why does photorespiration occur?

• stomata are closed and CO2 levels are too low.

• stomata are closed and O2 levels are too low.

• stomata are open and too much water is leaving the plant

• stomata are open and the plant receives too much CO2

What does a C4 plant do?

• stores CO2 in a separate cell from its photosynthetic cell during the day

• stores CO2 in a vacuole during the night.

• can't store CO2 so it sufferes photorespiration

• can't store CO2 so it speeds up cellular respiration in order to make more CO2