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Which of the following is considered an abiotic factor that causes damage to stored food grains?
Rodents
Moisture
Bacteria
Mites
Moisture
Moisture is an abiotic (non-living) factor that promotes the degradation of stored grains by increasing water activity (awтАЛ). High moisture levels facilitate chemical reactions and create a micro-environment suitable for the growth of molds and fungi, leading to grain spoilage.
Moisture is an abiotic (non-living) factor that promotes the degradation of stored grains by increasing water activity (awтАЛ). High moisture levels facilitate chemical reactions and create a micro-environment suitable for the growth of molds and fungi, leading to grain spoilage.
Think of leaving a piece of bread on the counter in a humid room; it gets moldy much faster than bread kept in a dry, airtight container because the moisture provides the necessary environment for microbial life to thrive.
awтАЛ=p0тАЛpтАЛ тАФ where awтАЛ is water activity, p is vapor pressure of water in the substance, and p0тАЛ is vapor pressure of pure water.
Excess moisture increases the respiration rate of the grain embryos and promotes the growth of hydrolytic enzymes. High humidity levels above critical thresholds (typically >14%) trigger the activation of lipase and protease enzymes, which degrade lipids and proteins, leading to rancidity and fermentation.
Abiotic factors include moisture, temperature, and humidity, while biotic factors include rodents, bacteria, fungi, and insects.
Safe moisture content for most cereal grains is generally maintained below 12тИТ14%.
Moisture induces both chemical hydrolysis and biological activity, causing a rapid decline in grain viability and nutritional quality.
Food storage facilities
Agricultural siloing
A) Rodents are biotic factors (living organisms that consume or damage grains).
C) Bacteria are biotic agents that cause spoilage through enzymatic degradation.
D) Mites are biotic pests that feed on grain dust and embryos.
B is correct тАФ Moisture is a non-living (abiotic) environmental variable that chemically and physically destabilizes stored grain quality.
In competitive exams, always classify factors into Biotic (Living: Insects, Rodents, Fungi) and Abiotic (Non-living: Moisture, Temperature, Humidity) to quickly eliminate wrong options.