Concept
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Created by Boundless
Double Fertilization in Plants
Embryo development
Shown are the stages of embryo development in the ovule of a shepherd's purse (Capsella bursa). After fertilization, the zygote divides to form an upper terminal cell and a lower basal cell. (a) In the first stage of development, the terminal cell divides, forming a globular pro-embryo. The basal cell also divides, giving rise to the suspensor. (b) In the second stage, the developing embryo has a heart shape due to the presence of cotyledons. (c) In the third stage, the growing embryo is crowded and begins to bend. (d) Eventually, it completely fills the seed.
Source
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"OpenStax College, Pollination and Fertilization. October 17, 2013."
http://cnx.org/content/m44723/latest/Figure_32_02_08abcd_a.jpg
OpenStax CNX
CC BY 3.0.