Question

define phyllotaxy briefly

Answer 1

phyllotaxy is the mode of arrangement of leaves on the stem of a given plant.
The mode of arrangement of leaves are of two types. They are: (1) Cyclic Phyllotaxy and (2) Spiral phyllotaxy.
here is a definite law according to which the leaves are arranged on the stem of a particular species. The arrangement is always regular and leaves are never placed on the stem in a haphazard manner.

Cyclic Phyllotaxy:

In the cyclic type of phyllotaxy the leaves at each node form a whorl with the leaves placed on a circle in which the angles between adjacent leaves are the same

Verticillate Phyllotaxy:

Nerium odorum  shows three leaves forming a whorl at each node while Alstonia scholaris  shows five or more leaves. These are instances of the verticillate type. Sometimes verticillate phyllotaxy is designated as whorled phyllotaxy.

Answer 2

Phyllotaxy refers to the pattern or arrangement of leaves on the stem or branch of a plant in Biologcal.It is of three types, alternate, opposite, and whorled phyllotaxy. In a science.lternate phyllotaxy, a single leaf arises from the node of a branch.. Plants with opposite phyllotaxy have two leaves arising from the node in opposite directions. It is found in guava and jamun plants. So this is the phyllotaxy present in guava.