Final answer:
a)True, tall fescue is more heat-resistant than perennial ryegrass due to its pest-resistant and drought-resistant traits that help it better endure warm temperatures.
Step-by-step explanation:
The statement that tall fescue has greater heat resistance than perennial ryegrass is indeed true. Grass species like tall fescue that are pest-resistant and drought-resistant typically have adaptations that allow them to better withstand warm temperatures. Conversely, species without these traits, such as perennial ryegrass, may struggle and decline in number under the same conditions. Tall fescue's deeper root systems and broader leaves, for example, help it conserve water and endure heat stress better than perennial ryegrass, whose shallower roots and finer leaves might lead to quicker water loss and heat damage.
Understanding how different grass species respond to environmental stressors is important in fields like agriculture and ecosystem management. For instance, selecting the appropriate grass species for lawns, pastures, or restoration projects can significantly influence the success and maintenance of these green spaces.