With respect to the stages of embryo development in dicots, select the correct option.
With respect to the stages of embryo development in dicots, select the correct option.
The correct option is D I-shaped→ octant stage→ triangular-shaped→ heart-shaped
In dicots, the zygote divides transversely to form a terminal (apical) cell and a basal cell. The terminal cell is termed the embryo cell. The larger basal cell is called the suspensor cell. The terminal cell by subsequent divisions gives rise to the embryo while the basal cell contributes to the formation of the suspensor. The terminal cell undergoes vertical division to form an I-shaped embryo (4 celled). Each of the 4 cells undergoes a transverse division to form the octant stage. At the time of development of octant, basal cells divide transversely forming a 6-10 celled filament, the suspensor which attains its maximum development by the time the embryo attains a globular stage.
With continuous development, the embryo becomes triangular and then heart shaped which is made up of 2 primordia of cotyledons.
In dicots, the zygote divides transversely to form a terminal (apical) cell and a basal cell. The terminal cell is termed the embryo cell. The larger basal cell is called the suspensor cell. The terminal cell by subsequent divisions gives rise to the embryo while the basal cell contributes to the formation of the suspensor. The terminal cell undergoes vertical division to form an I-shaped embryo (4 celled). Each of the 4 cells undergoes a transverse division to form the octant stage. At the time of development of octant, basal cells divide transversely forming a 6-10 celled filament, the suspensor which attains its maximum development by the time the embryo attains a globular stage.
With continuous development, the embryo becomes triangular and then heart shaped which is made up of 2 primordia of cotyledons.
