In sunlit leaves of a plant, the thylakoid lumen has a comparatively high concentration of:Group of answer choiceselectronsProtonsRubiscochlorophyll

The thylakoid lumen in sunlit leaves of a plant has a comparatively high concentration of Protons.

Here's the step by step process:

1. Photosynthesis begins in the thylakoid lumen of the chloroplasts in plant cells.

2. When sunlight hits the chlorophyll in the thylakoid membranes, it excites electrons and boosts them to a higher energy level.

3. These high-energy electrons are then passed along a series of proteins (the electron transport chain) embedded in the thylakoid membrane.

4. As the electrons move along the chain, their energy is used to pump protons (H+ ions) from the stroma of the chloroplast into the thylakoid lumen.

5. This creates a high concentration of protons within the thylakoid lumen, setting up a proton gradient.

6. The protons then flow back down their concentration gradient through a protein called ATP synthase, driving the production of ATP, the energy currency of the cell.

7. This process is known as photophosph