Photosystem I is directly associated with:
1. passing electrons to plastoquinone
2. receiving electrons from plastocyanin
3. P680 as the chlorophyll a reaction-center
4. removal of electrons and protons from water

The electrons excited to higher energy levels during photosynthesis belong to:

In cyclic electron flow:
1. the electron begins in a pigment complex called photosystem I, passes from the primary acceptor to ferredoxin and then to plastoquinone, then to cytochrome b6f, and then to plastocyanin before returning to chlorophyll.
2. the electron begins in a pigment complex called photosystem II, passes from the primary acceptor to ferredoxin and then to plastoquinone, then to cytochrome b6f, and then to plastocyanin before returning to chlorophyll.
3. the electron begins in a pigment complex called photosystem I, passes from the primary acceptor to ferredoxin and then to plastocyanin, then to cytochrome b6f, and then to plastoquinone before returning to chlorophyll.
4. the electron begins in a pigment complex called photosystem II, passes from the primary acceptor to ferredoxin and then to plastocyanin, then to cytochrome b6f, and then to plastoquinone before returning to chlorophyll.

You add a water-soluble inhibitor of photosynthesis to the roots of a plant. The plant is actively transpiring. You are surprised that photosynthesis is not reduced. This is most likely due to:

1. Xylem vessels being dead at maturity

2. Inability of roots to take up water-soluble chemical

3. Endodermis

4. Transport of the inhibitor by phloem

In the light dependent reactions of photosynthesis:
1. NADPH is reduced to ${\mathrm{NADP}}^{+}$ by the enzyme NADP reductase.
2. initial carbon fixation takes place forming a 3 carbon compound.
3. ATP is not produced.
4. light is absorbed and energy is transported to reaction-center chlorophyll a

The first step for initiation of photosynthesis will be
1. Photolysis of water
2. Excitement of chlorophyll molecule due to absorption of light
3. ATP formation
4. Glucose formation

The ions comprising the Oxygen Evolving Complex associated with PS II are:

Identify the correct statement:
1. The light reactions provide ATP and NADPH to the Calvin cycle.
2. The light reactions provide ${\mathrm{CO}}_2$ to the Calvin cycle.
3. The light reactions supply oxygen to the Calvin cycle.
4. Calvin cycle is in no way dependent on the light reactions.

Identify the incorrect statement regarding non-cyclic photophosphorylation:
1. Being a light reaction, non-cyclic photophosphorylation occurs in the thylakoid membrane.
2. The photosystem II complex replaces its lost electrons from an external source.
3. It generates both ATP and NADPH
4. When the chloroplast runs low on ATP for the Calvin cycle, the plant may shift from cyclic to non-cyclic electron flow.