Final answer:
The descriptions and structures are: a. Embryo; b. Seed; c. Endosperm; d. Seed; e. Embryo; f. Endosperm.
Step-by-step explanation:
a. This structure undergoes a series of distinct developmental stages regarding the cotyledons. Embryo
b. This is the mature dormant structure during unfavorable conditions. Seed
c. This structure performs a nutritive function. Endosperm
d. This one structure contains the other two. Seed
e. This is the first stage in the next sporophyte generation. Embryo
f. This structure is triploid following the process of double fertilization. Endosperm
Contains a region called the hypocotyl.