(a) Hypocotyl is part of embryonic axis below level of cotyledons. It terminates with the radicle or root tip where as Epicotyl is part of embryonic axis above the level of cotyledon. It terminates with the plumule or stem tip.

(b) Coleoptile is hollow foliar sheath that surrounds the plumule where as Coleorhiza is a sheath enveloping the radical or root cap.

(c) Integument is the protective covering around ovule. It is thin and living. It is formed before fertilization where as Testa is outer covering of seed coat. It is non-living. It is formed after fertilization

(d) Perisperm is remnant of nucellus in a seed. It is dry where as Pericarp is wall of ripened ovary or fruit and may be fleshy or dry.