The root systems of trees in tropical rain forests expand outward from the tree because
A)the trees are very short and do not need deep roots.
B)the ground temperatures in tropical forests are too high to allow for deep roots.
C)there is a shortage of rainfall in the region tends to prohibit effective plant growth.
D)the ground layer of vegetation in tropical forests is so thick so the roots extract nutrients from the vegetation.
E)the mineral content of the soil is shallow and hence roots expand laterally rather than vertically to exploit the shallow nutrient layer.

Question

Quizplus · Accepted Answer

The mineral content of the soil in tropical rain forests tends to be shallow, so tree roots expand laterally rather than vertically to exploit the shallow nutrient layer. This supports the growth of a diverse range of plant species, which create the dense ground layer of vegetation that characterizes tropical rain forests. Therefore, choice E is the best answer.

The Root Systems of Trees in Tropical Rain Forests Expand