Humber/Ontario Real Estate Course 3 Exam Practice

Which of the following is a common cause of mold growth in homes?

1. Dust accumulation.

2. Lack of heating systems.

3. Poor ventilation.

4. Exposure to sunlight.

5. Excessive insulation.

6. High-quality building materials.

The correct answer is: Poor ventilation.

The presence of poor ventilation is a significant contributor to mold growth in homes. Mold thrives in damp and humid environments, which can be exacerbated by inadequate airflow. When air circulation is limited, excess moisture from everyday activities, like cooking, bathing, or even breathing, can accumulate indoors. This trapped moisture creates the ideal conditions for mold spores to settle and grow, particularly in areas like basements, bathrooms, and kitchens where humidity levels are typically higher. In contrast, dust accumulation can contribute to mold growth indirectly if it retains moisture, but it is not a primary cause. Lack of heating systems can lead to cold, damp environments, but it is the resulting humidity that encourages mold. Exposure to sunlight typically helps reduce indoor moisture levels, as sunlight can dry out surfaces and inhibit mold growth, while excessive insulation, if designed properly, should not hinder airflow. Finally, high-quality building materials can often help prevent mold if they are designed to resist moisture, demonstrating that the quality of materials can actually contribute positively to reducing mold issues in specific scenarios.