The electron from photosystem II goes to photosystem I and finally taken up by NADP leaving an electron hole in photosystem II. This electron hole in photosystem II is filled up by the electron released from

Options

A. `CO_(2)`
B. `H_(2)O`
C. chlorophyll
D. light.

Answer

To solve the question regarding the electron hole in Photosystem II and what fills that hole, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Process of Photosynthesis**: Photosynthesis occurs in two main stages: the light-dependent reactions and the light-independent reactions (Calvin cycle). The light-dependent reactions involve two photosystems: Photosystem II (PSII) and Photosystem I (PSI).

2. **Identify the Role of Photosystem II**: In Photosystem II, light energy is absorbed, which excites electrons. These electrons are then transferred to an electron transport chain, ultimately moving to Photosystem I.

3. **Recognize the Electron Hole**: When an electron is transferred from Photosystem II to Photosystem I, it creates an electron hole in Photosystem II. This hole needs to be filled for the process to continue.

4. **Determine How the Electron Hole is Filled**: The electron hole in Photosystem II is filled by electrons derived from the splitting of water molecules (photolysis of water). This reaction releases oxygen as a byproduct and provides the necessary electrons to replace those lost from Photosystem II.

5. **Conclude the Source of Electrons**: Therefore, the electron that fills the electron hole in Photosystem II comes from water.

### Final Answer:
The electron hole in Photosystem II is filled by the electron released from **water**.

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