Question

use the drop - down menus to put the events of the light - dependent reaction of photosynthesis in the correct order. atp and nadph are produced. electrons are transported from psii to psi. light enters the chloroplast. oxygen is released as waste. the water molecule is split.

Explanation:

1. Light enters the chloroplast: This is the starting point as light is the energy source for the light - dependent reactions. Chloroplasts are the organelles where photosynthesis occurs, and light must first reach them.
2. The water molecule is split: When light is absorbed by Photosystem II (PSII), it provides the energy to split water molecules (\(H_2O\)). This process is called photolysis.
3. Oxygen is released as waste: As a result of water - splitting, oxygen (\(O_2\)) is produced and released.
4. Electrons are transported from PSII to PSI: The electrons from the split water molecules are passed through an electron - transport chain from PSII to Photosystem I (PSI).
5. ATP and NADPH are produced: At the end of the electron - transport chain, ATP (through chemiosmosis) and NADPH (by the reduction of \(NADP^+\)) are synthesized. These are energy - rich molecules that will be used in the light - independent reactions (Calvin cycle).

Answer:

1. Light enters the chloroplast.
2. The water molecule is split.
3. Oxygen is released as waste.
4. Electrons are transported from PSII to PSI.
5. ATP and NADPH are produced.