A group of students investigated two habitats: dense woodland and open grassland. • Trees are the dominant plants in woodland. The trees form a canopy under which flowering herbs, small shrubs and grasses grow. • Grasses are the dominant plants in grassland. The grasses and small flowering plants form a continuous ground cover with only a few small shrubs present. [Figure 1.1] shows photographs of the two areas. The students decided to compare the adaptations for reducing water loss in the plants growing in each area. The students suggested the following hypothesis: The density of stomata will be higher in plants found in the woodland habitat than in the grassland habitat.