CATDOLL : CATDOLL: What do willow leaves develop from? What do rice seeds develop from?

1. What do willow leaves develop from?

Willow leaves develop from willow buds

The green leaves of willow trees develop from buds. In the structure of branch buds, the growth point can make the bud axis continue to extend, the leaf primordium will develop into young leaves, the young leaves will develop into leaves, the bud axis will develop into stems, and the bud primordium will develop into lateral buds. Therefore, thousands of branches and green leaves are developed from buds. Buds are the embryonic bodies of immature branches or flowers.

2. What did rice develop from?

Rice is a monocotyledonous plant. The seed (actually the fruit - caryopsis) structure includes three parts: seed coat and pericarp, embryo, and endosperm. The embryo includes four parts: plumule, hypocotyl, radicle, and cotyledon. Rice is the endosperm structure of rice seeds. It has the largest volume and stores a large amount of nutrients. After the seeds germinate, the plumule develops into stems and leaves, the radicle develops into roots, and the hypocotyl develops into the part connecting the roots and stems. The cotyledons absorb nutrients in the endosperm to supply the development of the embryo, so the rice we eat mainly comes from the endosperm of rice seeds.

3. What does the ovary develop from?

The ovary is the organ of angiosperms that grows seeds. It is located below the pistil of the flower and is generally slightly swollen. The ovary contains ovules, which can develop into seeds after fertilization. It is the main component of the pistil in the flowers of angiosperms. The ovary is composed of ovary walls and ovules. After pollination and fertilization, the ovary develops into a fruit. The ovary wall eventually develops into a fruit skin, which wraps the seeds. Some species form pulp, such as peaches and apples.

Zifang is Zhang Liang.

4. What do seeds develop from?

Teacher Wang will explain this question to you: The embryo develops from the fertilized egg (a sperm combines with an egg cell). The endosperm develops from the fertilized polar nucleus (a sperm combines with two polar nuclei). The seed develops from the embryo. The seed coat develops from the perianth. The pericarp develops from the ovary wall. The fruit develops from the ovary.

5. What does the embryo develop from?

Develops from the fertilized egg cell.

Embryo refers to the early stage of development of organisms: plumule, hypocotyl, radicle, cotyledon, which is an important part of the seed of seed plants, and also refers to the month of pregnancy of women. The embryo is a young plant body, which develops from the fertilization of the egg cell. All parts of the embryo are composed of embryonic cells, which are small, with thick cytoplasm, large nucleus and strong division ability.

6. What do corn seedlings develop from?

Each corn kernel develops from the ovary, and the seedling develops from the embryo of the corn seed.

7. What do cotyledons develop from?

Cotyledons develop from the embryo in the seed.

8. What do leaf primordia develop from?

Generally, the initial protrusion is formed by the division of several layers of cells on the surface, and then grows in three directions: length, width, and thickness. However, the thickness growth starts and stops early, making the leaf primordium flat at an early stage. Later, the base continues to widen, and the base of some plants (such as Gramineae) can surround the entire growth cone. From the protrusion to the cessation of thickness growth, the whole is still composed of meristems, and the appearance has not yet differentiated into leaves, petioles, and stipules, which can be called leaf primordium.

9. What do prokaryotic cells develop from?

1. Cell division

Cell division refers to the process of proliferation of living cells and the division of their number from one cell to two cells. The cell before division is called the mother cell, and the new cell formed after division is called the daughter cell. It usually includes two steps: nuclear division and cytoplasmic division. During nuclear division, the mother cell passes genetic material to the daughter cell. Eukaryotic cell division includes mitosis, meiosis, and amitosis.

2 Types of cell division

Prokaryotic cells

We still don't know much, and we only have some specific knowledge about the division of a few bacteria. Prokaryotic cells have neither nuclear membrane nor nucleolus, but only a nuclear region composed of circular DNA molecules, also called nucleoid, which has similar functions to the nucleus. The DNA molecules of the nucleoid are either attached to the plasma membrane or to the plasma membrane body formed by the invagination of the plasma membrane, which is also called the interbody.

As the DNA replicates, the intersomes also replicate into two. Later, the two intersomes gradually move away due to the growth of the plasma membrane between them, and the two DNA molecular rings connected to them are pulled apart, and each DNA ring is connected to an intersome. Between the two pulled apart DNA rings, the cell membrane grows toward the center to form a diaphragm, finally dividing one cell into two cells.

Eukaryotic cells

According to the state of nuclear division, it can be divided into three types: mitosis, meiosis and amitosis. Mitosis is the basic form of eukaryotic cell division. Meiosis is the division process that causes the number of chromosomes in reproductive mother cells to be halved in organisms that reproduce sexually. It is a variant of mitosis and consists of two consecutive divisions.

Amitosis is also called direct division. Its typical process is that the nucleolus first elongates and splits apart by constriction in the middle, then the nucleus also elongates and constricts inward from one or both sides in the middle, making the nucleus kidney-shaped or dumbbell-shaped, and then breaks into two. Almost at the same time, the cell also constricts in the middle to divide into two daughter cells. Since the spindle composed of spindle fibers or the astral rays emitted by the centrosome are not formed during the division process, and the change from chromatin condensation to chromosomes does not occur, it is named amitosis.

10. What do flowers develop from?

Flowers develop from buds. Buds are divided into flower buds and branch buds. Flowers attract people with their bright colors, graceful shapes and fragrant smells. Flowers are actually shortened and modified branches. The structure of petals is also like that of leaves, divided into epidermis, basic parenchyma and vascular bundle. The epidermis of petals mostly has protrusions, trichomes and stomata, and the cuticle often shows wrinkled stripes.