Question

Angle of divergence in tristichous phyllotaxy is

• A. ${140}^o$
• B. ${135}^o$
• C. ${180}^o$
• D. ${120}^o$

Answer 1

Answer: (D)

${120}^o$

Phyllotaxy is the arrangement of the leaves on the stem. Tristichous phyllotaxy is also called as 1/3 phyllotaxy. In this, the first, fourth, seventh leaf bases falls on the same plane; the second, fifth, eighth leaf bases on the same plane and third, sixth and nineth on the same plane one above the other. In this, angle of divergence is 120${}^0$.

Thus, the correct answer is '120${}^0$.'