Question

In photosystem II, as high-energy electrons are passed to the electron transport chain the chlorophyll gains new electrons from

Answer 1

Ans.

Photosystem II is also known as water-plastoquinone oxidoreductase that performs light-dependent reactions of the photosythesis. In these reactions, water molecules act as electron donors as electrons are passed to the electron transport chain to make energy molecules or ATP and the chlorophyll gains new electrons by spliting of water molecules.

Thus, the correct answer is option b). Water molecules.

Answer 2

Answer: b. Water molecules

When sunlight is absorbed by one of many pigments present in photosystem II the light energy is distributed from pigment to pigment until it reaches the reaction center of photosystem II. The electrons present in the reaction center jumps to higher energy state on receiving light energy. Each high energy electron is passed to an acceptor molecule (plastoquinone) and replaced with an electron produced by splitting of water. The splitting of water produces oxygen and electrons. The high energy electrons are transferred to electron transport chain. The energy present in these electrons creates a gradient in the thylakoid membrane of chloroplast. The gradient facilitates the flow of H⁺ ions across thylakoid membrane and which lead to the production of ATP by enzyme ATP synthase.

Therefore, water is required to produce electrons in photosystem II.

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