Blue-green algae are commonly found growing in paddy fields as they act as a good

Biofertilizer

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Pest controlling agent

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Oxygenating organisms

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Pollution abatement agent

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Solution

The correct option is D Biofertilizer
Blue-green Algae (BGA) is a type of biofertilizer used as an alga form. Important species are Cyanobacteria, Anabaena, Nostoc, Tolypothrix. The algal mat in paddy fields protects loss of moisture from the soil.
A. Bio-fertilizers are eco-friendly are environmentally safe and have low cost. They are widely used in paddy production. The most common bio-fertilizers are Azospirillum, Phosphobacteria, Blue-green algae, Azolla and mycorrhiza.
So the correct answer is "Biofertilizers".

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