The structures of bean seeds and corn seeds are as shown in the figure:

(1) In the figure, the structure represented by the number 2 is the radicle, and the structure represented by the number 10 is the endosperm. ．

(2) Five cotyledons, which provide nutrients for the radicle, hypocotyl and embryo.

(3) The branches develop from the 4 germs in Figure 1

(4) The embryo of the seed consists of four parts: germ, hypocotyl, radicle and cotyledon. It is a new The larvae of plants are the main parts of seeds; in the picture, numbers 1, 2, 4, and 5 in the bean seeds and numbers 7, 8, 9, and 11 in the corn seeds are collectively called embryos.

So the answer is: (1) Radicle; endosperm.

(2) Provide nutrition to the radicle, hypocotyl and embryo.

(3)4.

(3) Embryo.