Which of the following statements is true regarding turf?

The statement that turf includes various grass cultivars and combinations is true because turf refers to a specific layer of soil that's covered with grass plants, which can consist of different types of grass species or cultivars bred for desirable characteristics such as drought resistance, color, and texture. This diversity allows for tailored grass mixtures that can be suited to specific environmental conditions or aesthetic preferences.

In many landscaping and recreational contexts, the use of various grass types can improve the overall health and resilience of the turf. For example, some cultivars may thrive better in shaded areas while others are more adapted to full sun. This adaptability makes turf more versatile in landscape design, fulfilling different needs and functions.

The other statements do not accurately represent the comprehensive nature of turf. For instance, stating that turf is only composed of sod overlooks the broader definition that includes various grasses. While sod is indeed a functionally grown piece of turf, it is not the only component of what can be considered turf in landscaping. Additionally, the claim that turf cannot be used in landscapes is incorrect, as turf is commonly used in residential yards, sports fields, parks, and various landscapes due to its aesthetic appeal and functional benefits.