Why is soil depth important for plants?

Correct answer: Deep soil helps roots spread and take water

Soil depth matters because roots need enough space to grow, anchor the plant, and reach stored water and nutrients. Deep soil can provide a larger zone for root development, which may help a plant obtain moisture during periods when the surface becomes dry. Therefore, option A is correct. The benefit is not simply the word “deep”; it depends on the soil also having suitable moisture, air, and nutrients.

The other choices are incorrect because deep soil does not block sunlight or remove air, and it does not always destroy plants. In fact, many plants benefit from adequate soil depth, although very shallow, waterlogged, compacted, or poor soil can limit growth. The question’s basic reasoning is to connect soil depth with root space and access to water, making the first option the best answer.