What gas is released during photosynthesis?

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Prepare for your Leaving Certificate Photosynthesis Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

What gas is released during photosynthesis?

Explanation:
Photosynthesis uses light energy to split water, and the resulting oxygen gas is released from the plant. The light-dependent reactions drive the splitting of water, providing electrons for the electron transport chain and producing O2 as a byproduct that exits the leaf. The overall equation shows oxygen on the product side, while carbon dioxide is taken in to build sugars, not released. Nitrogen isn’t produced in this process, and hydrogen isn’t released as free H2 gas; its role is in forming water or carrier molecules like NADPH.

Photosynthesis uses light energy to split water, and the resulting oxygen gas is released from the plant. The light-dependent reactions drive the splitting of water, providing electrons for the electron transport chain and producing O2 as a byproduct that exits the leaf. The overall equation shows oxygen on the product side, while carbon dioxide is taken in to build sugars, not released. Nitrogen isn’t produced in this process, and hydrogen isn’t released as free H2 gas; its role is in forming water or carrier molecules like NADPH.

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