Observe the structural diagrams of the cauliflower and corn seeds and answer the following questions: (1) Write the names of the structures represented by the numbers in the cross-section of the cauliflower seed: 2____ Solution: The structures of the kidney bean seed and the corn seed are shown in the diagrams:

(1) In the diagrams, the structure represented by the number 2 is the radicle, and the structure represented by the number 4 is the germ.

(2) The nutrients of the bean seed are stored in the cotyledons, and the nutrients of the corn seed are stored in the endosperm. Starch turns blue when exposed to iodine solution. The nutrients in corn seeds are mainly starch, and the nutrients in corn seeds are mainly stored in the endosperm. Therefore, if you put a drop of iodine solution on a corn seed section, the endosperm will turn blue. The function of endosperm is to store nutrients.

(3) The embryo of a seed consists of four parts: the germ, the embryonic axis, the radicle and the cotyledon, which is the young body of a new plant and the main part of the seed; 1, 2, 4, 5 in the bean seed and 7, 8, 9, 11 in the corn seed are collectively called the embryo.

The answers are:

(1) radicle; germ

(2) 10; storage of nutrients;

(3) embryo.