Disease Resistance - GCSE Biology Definition

Disease resistance is the ability of an organism, like a plant or an animal, to prevent or fight off infections caused by harmful pathogens, such as bacteria, viruses, or fungi. This can happen naturally, where the organism's body stops the pathogens from causing harm, or through adaptations developed over time. For example, some plants produce chemicals that repel insects or stop diseases from spreading. In animals, the immune system plays a big role in disease resistance by recognising and destroying harmful microorganisms. Understanding disease resistance helps us learn how to protect crops and animals from illness, ensuring they stay healthy and productive.