CATDOLL : CATDOLL: What method can make the earthworms in the ground crawl to the surface quickly?

1. What method can make the earthworms in the ground quickly crawl to the surface?

After watering, rainwater will seep into the soil. At this time, the gaps in the soil will be filled with water, and there will be less oxygen in the soil. It will be more difficult for earthworms to breathe underground than when it is not raining, so they crawl to the ground.

2. How to dig earthworms in winter

Look for ditches and places with water flowing around the house. The soil is fertile and there are usually earthworms. The ditches are about 15 cm long.

3. Why can earthworms be broken into several parts?

The internal structure of an earthworm is repeated over and over again. It depends on how you cut the earthworm. If you cut right into the heart, both ends will die. If you cut right into the part that separates the repeated parts, both ends will survive.

Earthworms are eukaryotic organisms.

To be precise, they do not necessarily grow into two. Earthworms are a relatively advanced species in the phylum Annelida, and their structure is more complex than many annelids. They have a digestive system and a circulatory system, which are the prerequisites for their development into vertebrates!

It also has dorsal blood vessels. If it loses too much blood when cut, it may not become two. There are many external factors that can affect its growth. If it is under the conditions of temperature, pH and sterilization, it is possible to survive!

It is like plant tissue culture. Of course, cutting off earthworms and tissue culture are not the same principle, but they both express that the lower the organism, the greater its ability to develop into an identical independent individual.

Earthworms are lower-level annelids with heads and tails, mouths, stomachs, intestines, and anuses. Their bodies are made up of two pointed tubes that are inserted together. The outer layer is a body wall that is connected in rings, and contains many muscle systems composed of mesoderm cells. There is a digestive tract in the body that runs through layers of diaphragms from head to tail. Between the inner and outer layers of the tubes, there is a full body cavity fluid. There is a small hole on the ventral side of each diaphragm, which serves as a channel for the body cavity fluid to pass through the body.

If the earthworm is cut into two parts, the muscle tissue on the cut surface will immediately strengthen its contraction, and part of the muscle tissue will quickly dissolve to form a new cell mass. At this time, the white blood cells in the blood will gather on the cut surface at the same time, forming a special embolism to quickly close the wound. Its mesoderm cells have strong

3. Research on earthworm regeneration ability:

If an earthworm is cut into three parts, can the middle part survive?

The earthworm Eisenia fetida was cut from a specific part to obtain 18 body segments of three types: head without tail, head without tail, and head without tail. The body segments were cultured in an artificial climate chamber at 20℃ to observe their regeneration. The results showed that the body segments of earthworms after shearing began to regenerate at about 10 days, and had the ability to regenerate from head to tail; but the regeneration ability of earthworms in different body segments was different. The regeneration speed of body segments with head without tail and head without tail was faster than that of body segments with head without tail. Among them, the head and tail of the body segments of headless and tailless earthworms can regenerate, but the regeneration speed of the tail is significantly higher than that of the head. The number of body segments left after shearing has a great influence on the survival rate of earthworms. The more body segments left, the lower the mortality rate of earthworm body segments, and the two are positively correlated.

(But there is also a saying that not every earthworm has this ability)

Among them is the regeneration of ciliates and planarians. It is also mentioned that the regeneration ability of coelenterates and planarians decreases from the front to the back of the body along the body axis: the mouth end or head is the strongest, and the anti-mouth end or tail is the weakest. The nervous system of the head of planarians is concentrated and the metabolic rate is the highest. There are many undifferentiated cells that remain in the embryonic state in the head of planarians and the mouth end of coelenterates, which may be the reason for the strong regeneration ability of the head. The regeneration ability of the head of earthworms is also stronger than that of the posterior body segments. If the earthworm is cut into two sections and the ventral nerve is removed, the earthworm loses its regeneration ability. These experiments all show that nerves play an important role in regeneration.

5. Further test the regeneration ability of earthworms:

Earthworms have a strong regenerative ability. When their bodies are cut, embryo-like tissue will grow at the broken part, quickly compensating for the lost part and growing into a new earthworm. The earthworms with strong regenerative ability are cut at the front five to eight segments. If the earthworms are cut at more than nine segments, the regenerative ability is very slow and the reproductive organs cannot be restored. If the earthworms are cut after the fifteenth segment, the head cannot be regenerated, and only a tail body without a head will grow, becoming a deformed earthworm with two tails.

How long can a phenotypic animal survive with two tails (does the caudate body have the physiological structure of a tail) without feeding? Or does it use the aboral part to feed in a metamorphosis?

6. Someone has done an experiment where they cut off the front and back ends of two earthworms and connected them together to form a new earthworm. Someone else was even more creative and connected the back ends of two earthworms side by side to the front half of one earthworm. In this way, they grew an earthworm with one head and two tails.

4. Please briefly describe the movement process of earthworms

Earthworms live in moist, loose soil rich in organic matter. They have many rough bristles on their bodies. They move with bristles and muscles.

The movement of earthworms is accomplished by the interaction of longitudinal and transverse muscles and the coordination of bristles on the body surface. When the earthworm moves forward, the bristles at the back of the body are nailed into the soil and do not move. At this time, the transverse muscles contract and the longitudinal muscles relax, and the body stretches forward. Then the bristles at the front of the body are nailed into the soil and do not move. At this time, the longitudinal muscles contract and the transverse muscles relax, and the body shortens forward and moves forward.

For more details, you can find the book General Biology, which contains detailed information.