At the end of the electron transport chain, where is the light energy that was absorbed and converted by chlorophyll stored? List two answers.

When luminous energy reaches Photosystem II, electrons get excited, and their transport along the chain begins. At the end of the electron transport chain, the light energy is stored in ATP and NADPH molecules.

Steps in the electron transport chain:

1.Luminous energy is trapped by chlorophyll in Photosystem II.

2.When the pigment molecules absorb light, electrons provided by water molecules, get in a higher energy level.

3.The excited electrons go through the electron transport chain from Photosystem II to a less energetic level in photosystem I.

4.When the excited electrons leave photosystem II, they are replaced by new electrons extracted from the water molecules.

5.Luminous energy absorbed move the electrons from the photosystem I to another electron acceptor, from where they get transported again and used to produce NADPH molecules.

6.When electrons leave Photosystem I, they are replaced by new electrons coming from photosystem II.

7.When the water molecule breaks down, hydrogen ions remain in the thylakoid lumen, from where they are pumped to the stroma by the ATP synthase.

8.The released energy is used to produce ATP molecules.

9.Hydrogen ions go back from the stroma to the thylakoid compartment.

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In light-dependent reactions, the energy from sunlight is absorbed by chlorophyll and converted into chemical energy in the form of electron carrier molecules like ATP and NADPH. Light energy is harnessed in Photosystems I and II, both of which are present in the thylakoid membranes of chloroplasts

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