MDARD Michigan Core Pesticide Applicator Practice Exam

What defines host resistance in plants and animals?

1. Ability to attract more pests

2. Resistance of some species to certain pests

3. Growth rate of a specific organism

4. Size variations among different species

The correct answer is: Resistance of some species to certain pests

Host resistance in plants and animals refers to the inherent capacity of certain species to withstand or repel specific pests or pathogens. This resistance can manifest in various forms, such as physical barriers (like tougher skin or leaves) or biochemical defenses (like producing toxins or repellent compounds) that deter pests from feeding or reproducing. By understanding host resistance, farmers and agricultural professionals can select plant varieties or animal breeds that are more likely to thrive despite the presence of pests, leading to more sustainable agricultural practices. The other options do not accurately capture the essence of host resistance. For instance, the ability to attract more pests would contribute to greater infestations rather than resistance. Growth rate and size variations, while important ecological and biological factors, do not directly define how well an organism can fend off or avoid pests. Hence, the focus on resistance of certain species to particular pests makes the chosen answer correct.