How do biotic and abiotic factors in stored grains leads to poor marketability?

Biotic and abiotic factors can significantly affect the marketability of stored grains in several ways:

1. Biotic Factors: These are living factors such as insects, rodents, fungi, and bacteria.

   • Insects and Rodents: They can cause physical damage to the grains, reducing their quality and marketability. They can also contaminate the grains with their droppings, making them unfit for human consumption.

   • Fungi and Bacteria: These microorganisms can cause diseases in grains, leading to spoilage. Some fungi can produce mycotoxins, which are harmful to humans and animals. This not only reduces the quality of the grains but also poses a health risk, thus reducing their marketability.

2. Abiotic Factors: These are non-living factors such as temperature, humidity, and light.

   • Temperature: High temperatures can accelerate the growth of insects and microorganisms, leading to faster spoilage of grains. On the other hand, very low temperatures can also damage the grains and reduce their quality.

   • Humidity: High humidity can promote the growth of fungi and bacteria, leading to spoilage. It can also cause the grains to absorb moisture, making them less crisp and reducing their quality.

   • Light: Exposure to light can cause the grains to lose their color and become less appealing, reducing their marketability.

Therefore, proper storage conditions and pest control measures are crucial to maintain the quality of stored grains and ensure their marketability.