Option 1: Compost - Compost is not a biofertilizer. It is a form of organic matter that is added to the soil to improve its structure and provide nutrients.
Option 2: Ammonium sulphate - Ammonium sulphate is a chemical fertilizer that provides nitrogen to plants. It is not a biofertilizer.
Option 3: Cattle dung - Cattle dung is a source of organic matter and nutrients for plants. It contains beneficial microorganisms that can improve soil fertility and plant growth, making it a biofertilizer.
Option 4: Algae and blue-green algae - Algae and blue-green algae are types of biofertilizers. They are rich in nutrients and can fix atmospheric nitrogen, making it available to plants. They also enhance soil fertility and improve soil structure.