Most grasses have which type of stem and root structure?

Most grasses possess a hollow stem structure along with a fibrous root system, making the second choice the correct one. The hollow stems allow for lighter structure while still providing necessary support to the plant, which is essential for wind resistance and growth in variable environments. The fibrous root system is adapted for efficient water and nutrient uptake from the surface soil, which is particularly advantageous for grasses in diverse ecosystems. This type of root structure also helps in preventing soil erosion, as the widespread and shallow roots can bind the soil more effectively compared to a tap root system.

Recognizing these characteristics helps one understand the ecological roles that grasses play in their environments, including their importance in preventing erosion and serving as a primary food source for various herbivores. Grasses are also adapted for quick responses to grazing pressure, and their stem and root structures facilitate rapid growth and recovery.