Plant embryos . a. rely on protection and resources supplied from the maternal plant. b. result from fertilization external to the maternal tissue. c. start haploid but become diploid as they grow. d. are produced by meiosis of the diploid gametophyte body. e. are the beginning of the gametophyte stage.

A) rely on protection and resources supplied from the maternal plant.

Explanation:

The embryo is a structure formed after the fusion of the male gamete and female gamete. A diploid zygote is formed after cellular division forms the embryo in the female gametophyte and therefore is considered the diploid tissue.

The embryo requires the nutrients for growth and absorb them from the surrounding female gametophyte structure like endosperm in the angiosperm. The embryos grow and form the sporophytic structure.

Thus, Option-A is correct.

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answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;