The graph below shows the mass of plants as succession progresses. What is the
cause of the drop in the moss population?
Pine
Trees
Shrubs
Mass of Plants
Oak
Trees
Grasses
Mosses
Time
The formation of the climax community of the forest
Competition for light and resources with grasses
A lack of soil nutrients in the environment
Competition for light and resources with the oak tree

Competition for light and resources with grasses

Explanation:

Mosses are small, flat brioftas that have no conductive vases, flowers, fruits and seeds. In a situation where a region has an intense density of trees as shown in the question above, mosses may be left with a limited amount of resources necessary for their survival, which will decrease their population. As a result, the moss will compete with other plant species.

In relation to the question above, the population of mosses would decline due to the competition for resources with grasses, this is because grasses have advantages in the absorption of resources, due to their biology.