Why do most angiosperms have alternate phyllotaxy, with leaf emergence at an angle of 137.5° compared to leaves above and below?
A) to allow maximum exposure to light
B) to promote a leaf area index above 8
C) to reduce shading of lower leaves
D) to allow maximum exposure to light and to reduce shading of lower leaves

Question

Quizplus · Accepted Answer

Alternate phyllotaxy ensures that each leaf receives maximum exposure to light while also reducing shading of lower leaves. The angle of 137.5° is the result of the Fibonacci sequence, which is found in many natural growth patterns.

Why Do Most Angiosperms Have Alternate Phyllotaxy, with Leaf Emergence