In 1/2 distichous phyllotaxy

Options

A. 2nd leaf lies on 1st leaf at 180° angle
B. 3rd leaf on 1st leaf at 180° angle
C. 1st leaf lies exactly below 2nd leaf at 120° angle
D. None of these

Answer

B

Explanation

In distichous or 1/2 phyllotaxy the leaf on the second node is just opposite the leaf on the first node the third leaf is above the first leaf, the fourth above the second and so on. Thus the angular divergence is clearly `180^@` and all the leaves fall in two opposite orthostichies.