There are six kinds of glands in spider abdomen; This is called a spinneret. Various glands produce different types of spider silk. There is a spinneret at the top of the gland with thousands of small holes on it. The sprayed liquid condenses into spider silk with strong viscosity and high tension when it meets air. It is said that 1000 silk thread is one tenth thinner than human hair after fusion. Spider silk consists of a fibroin. For a specific diameter, the tensile strength of spider silk is greater than that of steel.

Why do spiders spin silk?

Nor can it be generalized. Spiders are generally divided into two types. One is the most common web spider. They weave webs between branches and use them to hunt. The other kind does not weave a net. They wander around looking for prey and then kill it with fangs. This species is a hunting spider.

When the cold wave comes, the safari spiders will spin a lot of silk in the corner and start to weave webs. They weave a dense net, and then they will get in. Generally, they hibernate at this moment and hibernate for a long time until the end of the next spring. Spider webs usually die after laying eggs in autumn. In the cold wave, they can't weave webs, they can't spin silk, and they will die.

What kind of weather does a spinning spider represent?

"Spiders weave webs, and it will clear up after a long rain", which means: when it rains, spiders start to weave webs to catch insects, which indicates that it will clear up; On the other hand, spiders close their nets, which indicates that it will rain. So, why do spiders have this ability to predict the weather? A: Scientists have found that spiders can predict the weather mainly because they are quite sensitive to humidity changes in the air. It turns out that there are many small spinnerets on the spider's tail, which are sticky and cold. When rainy days come, because of the high air humidity and a lot of water vapor, the water vapor is easy to condense into small drops on the spider's spinneret, which makes it difficult for the spider to spin silk, but it stops spinning and closes the net. On the contrary, when the air humidity becomes smaller and the weather becomes better, spiders can spin webs smoothly without interference from small water droplets.

Why do spiders spin silk where people don't use it?

Places with few people are basically places where other small insects often go or are more common, and these are mostly the physical sources of cobwebs. One of the main functions of cobwebs is to hunt food, so it is more efficient to cast webs only where there is more food.

How do spiders spin silk?

I can't help wondering in my mind: how did cobwebs come from? How do spiders spin silk? At first, I naively thought that spiders must have stolen many, many filaments to weave webs. In order to answer these questions, I began to do experiments. First of all, I caught two spiders and put them in paper cups, wrapped them in cardboard, poked some holes, raised them and made them hungry for a day. The experiment officially began the next day. I first poured one of the spiders out and put it on a board, wrapped the second half of it with scraps of paper, and then released the small insects caught in advance as bait to let the spiders spin silk like this. I saw one spider stop spinning and the other one was spinning. I immediately pointed a magnifying glass at the spider and found that the spider's "ass" was spinning silk. So I checked the information: there are several pairs of "weavers" at the bottom of the spider's stomach, and spider silk flows out of the weavers' holes. The composition of spider silk is protein, which is similar to silk. It was still sticky "glue" when it first came out. When it comes into contact with air, it immediately hardens and becomes silk. This experiment not only satisfied my curiosity, but also enriched my knowledge, and made me understand that spiders spin silk through the small holes at the end of the stomach. Their silk can not only protect themselves, but also capture food.

Why do spiders spin silk before and after it rains?

Before and after rain, spiders like to hide in corners. They use the characteristics of other insects to evolve.

Red rose spider spins silk. What happened?

It's normal, maybe it's cleaning up garbage, maybe it's molting. If it lies on its silk, don't think it is dead. Maybe it's molting If it doesn't eat food, it is likely to shed its skin. Bird-eating spiders don't catch prey by weaving webs, but basically have spinning machines.

What is a filter dictionary?

It is to regard yellow things as fish and filter dictionaries as fishing nets. The mesh is smaller than that of fish. When you get off the net, fish are fished up, and you are not allowed to sow seeds in the water.

Spiders and silkworms can spin silk. Are all insects? why

Silkworms are insects, but spiders are not insects.

Spiders and insects belong to arthropods (Arthropoda), but they belong to different classes. Insects are of course insects, while spiders belong to arachnida.

According to the morphology, different arthropods are divided into classes, mainly in the following aspects: the body of arachnids is only divided into chest and abdomen. There are 6 pairs of appendages in the head and chest, namely a pair of redundant limbs, a pair of foot whiskers (touching limbs) and 4 pairs of walking feet; And no tentacles. Abdominal limbs are almost completely degenerated. Breathe through the lungs and trachea. Insects, on the other hand, have three parts: head, chest and abdomen. The head has four pairs of appendages, including a pair of tentacles, a pair of jaws, a pair of left and right lower lips, and three pairs of walking feet in the chest. Abdominal appendages are almost completely degenerated.

So spiders are not insects.

Why do spiders spin silk from * *

Save your mouth to eat,