Consider a single electron's movement through the light reactions. Put these steps of the light reactions in the correct order from this electron's perspective:
1. Light excites the electron in photosystem I.
2. Light excites the electron in photosystem II.
3. The electron reduces NADP+ to NADPH.
4. The electron passes through an electron transport chain, which helps generates a H+ gradient used to make ATP.
steps 2, 4, 1,3
steps 1, 2, 3, 4
steps 2, 3, 1,4
steps 1, 4, 2, 3

steps 2, 3, 1, 4

Explanation:

The light dependent reaction of photosynthesis involves the production of ATP and NADPH needed for the next stage of photosynthesis (Calvin cycle) to produce sugars. The light stage occurs in the thylakoid membrane of the chloroplast, which contains certain complex pigments called PHOTOSYSTEM.

The order or electron flow in the light stage is as follows:

- Light excites the electron in photosystem II to split water into hydrogen and electrons.

- Light excites the electron in photosystem I and loses its electrons to the final electron acceptor, NADP+

- The electron reduces NADP+ to NADPH

- The electron passes through an electron transport chain, which helps generates a H+ gradient used to make ATP from ADP as catalysed by ATP synthase

prophase: we can observe the chromosomes to coil up and condense. they become visible. nuclear membrane and envelope disintigrate.s

metaphase: chromosomes align at the center, the metaphase plate. spindle fibers attach to centromeres of the sister chromatids. they meet at kinetochores.

anaphase: sister chromatids are pulled towards each opposing centromere, set on different poles.

telophase: chromosomes are now clustered up only on either sides of the cell. nuclear membranes reform, and a new cell wall forms along the cell plate. this will lead to cytokinesis, the process that divides the cell membrane and forms the cell wall.

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