Bubbles of gases support masses of floating Spirogyra in a pond. The gas is

Oxygen

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Nitrogen

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Carbon dioxide

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Ethane

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Solution

The correct option is A Oxygen
Spirogyra: a member of a genus of around 400 species of free-floating green algae (division Chlorophyta) found in freshwater environments. Named for their beautiful spiral chloroplasts, Spirogyra is filamentous alga that consists of thin unbranched chains of cylindrical cells. They can form masses that float near the surface of streams and ponds, buoyed by oxygen bubbles released during photosynthesis. They are commonly used in laboratory demonstrations. Hence the correct option is A.

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