Describe the embryonic plant inside?

Question

Thank you.

Answer 1

Which plant? The embryonic plant is the developing plant in a seed after double fertilization. A pollen grain contains two sperm nuclei...One sperm fertilizes the egg to form a zygote ~ embryo (new 2N sporophyte) and the second fertilizes the two polar nuclei to produce endosperm (the food/nutrient material in a seed). The integument forms a seed coat to contain the new developing plant. Is this enough?

Answer 2

Following fertilization the zygote undergoes an asymmetrical cell division that gives rise to a small apical cell that becomes the embryo and a large basal cell called the suspensor that functions to provide nutrients from the endosperm to the growing embryo. Asymmetrical cell division also seems to be important in the development of somatic embryos, and while failure to form the suspensor cell is lethal to zygotic embryos, it is not lethal for somatic embryos. From the eight cell stage (octant) the zygotic embryo, embryo patterning is apparent, somatic embryos at this stage may be quite variable, therefore zygotic and somatic embryo most comparable from the globular stage.

The globular stage the embryo develops radial patterning through a series of cell divisions, the outer layer of cells differentiates into the protoderm. The globular embryo can be though of as two layers of inner cells with distinct developmental fates, the apical layer will go on to produce cotyledons and shoot meristem, while the lower layer produces the hypocotyl and root meristem. Bilateral symmetry is apparent from the heart stage, provasular cells are also differentiate at this stage. In the subsequent torpedo and cotyledonary stages of embryogenesis, the embryo completes its growth by elongating and enlarging.