An external source of electrons is not required during (1) Cyclic ETC in stroma (2) Photochemical phase in stroma lamella (3) Non-Cyclic ETC in chloroplast l (4) Light reaction in stroma?

Question

Answer

External Source of Electrons in Photosynthesis

Cyclic ETC in Stroma

During the cyclic electron transport chain (ETC) in the stroma, an external source of electrons is not required. This process occurs when the electrons from the excited photosystem I are passed back to the electron transport chain, creating a proton gradient that is used for ATP synthesis. This process only generates ATP and does not produce NADPH or oxygen.

Photochemical Phase in Stroma Lamella

The photochemical phase in stroma lamella also does not require an external source of electrons. During this phase, light energy is absorbed by photosystem II, which then excites electrons that are passed down the electron transport chain. This generates ATP and NADPH, which are used in the subsequent dark reactions of photosynthesis.

Non-Cyclic ETC in Chloroplast

The non-cyclic electron transport chain in chloroplasts uses an external source of electrons. During this process, photosystem II absorbs light energy, which excites electrons that are passed down the electron transport chain. This generates ATP and NADPH, which are used in the dark reactions of photosynthesis. Water molecules are split during this process, providing the electrons that are used in the electron transport chain.

Light Reaction in Stroma

The light reaction in the stroma also does not require an external source of electrons. During this process, photosystem I absorbs light energy, which excites electrons that are passed down the electron transport chain. This generates ATP and NADPH, which are used in the dark reactions of photosynthesis.

In summary, an external source of electrons is not required in the cyclic ETC in stroma and photochemical phase in stroma lamella, while an external source of electrons is used in the non-cyclic ETC in chloroplasts. The light reaction in the stroma does not require an external source of electrons.

Answer

Cyclic phosphorylation

Answer

1

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