The term Pteridophyta was first coined by Haeckel. Eichler (1883) divided the plant kingdom into …

They are the earliest known vascular plants that originated in the Silurian period (400 million …

Telome theory was proposed by Walter Zimmerman (1952, 1965). This theory is based on fossil …

In the kingdom Fungi, there are two major phyla- Ascomycota and Basidiomycota. These two together …

Modern embryology seems to comprise three main disciplines. The first, or descriptive embryology, is a …

The phenomenon of polyembryony, i.e., the occurrence of more than one embryo in a seed, …

Apomixis maybe defined (Winkler, 1908, 1934) as the substitution for sexual reproduction (amphimixis) of an …

Fertilization is the union of male and female gametes to produce a zygote. There are …

The angiosperm female gametophyte is critical for plant reproduction. It contains the egg cell and …

In 1898, Nemec noted that in the petaloid anthers of Hyacinthus orientalis, the pollen grains …