As shown in the figure, the seed structure of kidney beans is shown. Please answer according to the figure: (1) Write the names of each structure in the figure: ① _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ : (1) in the figure; ① Cotyledons? 2 germ? ③ hypocotyl? ④ radicle? ⑤ Seed coat.

(2) Kidney bean belongs to dicotyledonous plants, and its seed structure includes seed coat and embryo, and embryo includes radicle, hypocotyl, embryo and cotyledon, among which seed coat has protective function; The radicle eventually developed into the main root of the seedling; The hypocotyl eventually develops into a part connecting the stem and the root; The germ eventually develops into stems and leaves; Cotyledons store a lot of nutrients.

(3) The embryo of kidney bean seed is composed of ① cotyledon, ② embryo, ③ hypocotyl and ④ radicle, and the seed coat has protective function.

So the answer is: (1)① Cotyledon? 2 germ? ③ hypocotyl? ④ radicle? ⑤ Seed coat. (2) ① Cotyledon (3) embryo; ⑤； seed coat