Current location - Recipe Complete Network - Fat reduction meal recipes - The picture is a schematic diagram of the structure of a kidney bean seed. Please answer according to the picture: (1) When a seed germinates, the first thing to break through the seed coat is ______.
The picture is a schematic diagram of the structure of a kidney bean seed. Please answer according to the picture: (1) When a seed germinates, the first thing to break through the seed coat is ______.
The picture is a schematic diagram of the structure of a kidney bean seed. Please answer according to the picture: (1) When a seed germinates, the first thing to break through the seed coat is ______. (fill in text) (2)

It can be seen from the picture: 1 embryo, 2 hypocotyls, 3 radicles, 4 cotyledons, and 5 embryos.

(1) The process of seed germination: During the germination process, seeds first absorb water, expand in size, and rupture the seed coat. At the same time, the life activities in the embryo become active. After receiving nutrients and energy from the cotyledons, it begins to divide and grow: the radicle elongates, protrudes from the seed coat, and develops into a root. Soon, some fine roots sprouted from around this root.

(2) The embryo develops into the stem and leaves, and the hypocotyl develops into the part connecting the stem and the root.

(3) All plant seeds include seed coat and embryo. The embryo is composed of four parts: germ, hypocotyl, radicle and cotyledon. Bean seeds have two cotyledons, which contain nutrients. Stored in cotyledons. Corn seeds have only one cotyledon, and nutrients are stored in the endosperm.

(4) When a flower completes pollination and fertilization, the ovary development situation is

. We also know that the main part of the seed is the embryo. The embryo is the larvae of a new plant, so the embryo, the main part of the seed, develops from the fertilized egg.

(5) The conditions for seed germination are divided into internal conditions and external conditions. The internal conditions are a complete and viable embryo and nutrients for embryo development; the external conditions are suitable temperature, appropriate amount of water and sufficient air. Early spring sowing often affects seedling emergence due to low temperature. In order to solve this problem, plastic films are often used to cover the ground to increase the ground temperature and promote early and uniform emergence. Therefore, after sowing in early spring, plastic films are often used to cover the ground. The main reason for promoting early emergence is to provide an appropriate temperature for seed germination.

So the answer is: (1) radicle; (2) 1; (3) endosperm; (4) fertilized egg; (5) providing suitable temperature for seed germination.

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