Question

Why do most angiosperms have alternate phyllotaxy, with leaf emergence at an angle of 137.5° compared to leaves above and below?

A. to reduce shading of lower leaves
B. to allow maximum exposure to light
C. to promote a leaf area index above 8
D. to allow maximum exposure to light and to reduce shading of lower leaves

Answer 1

Answer: The answer is D: to allow maximum exposure to light and to reduce shading of lower leaves.

Step-by-step explanation:

The arrangement of leaves on a Stem is known as Phyllotaxy. It is used to enable them obtain maximum exposure to sunlight.

Leaves are classified as either alternate, spiral or opposite.

Leaves with alternate pattern arise at a different point (node) on the stem. This helps reduce shading of the lower leaves.