What do you think of the phenomenon of dragonflies dotting water?

Dragonflies are fertilized eggs.

The male holds the female's head or chest with a grip at the end of the abdomen, and its movements lure the female to bend her abdomen forward to contact the copulator at the base of the male's abdomen. It mostly lands on the ground during mating, but it can also be done in the air. The mating time is a few seconds to several hours.

Females lay eggs immediately after mating, or after hours or days.

Dragonflies are dragonflies laying eggs, which are laid directly in the water or on aquatic plants. The larvae that hatch from their eggs are called water flies. The water fly often sticks out of its lower lip with a hook-like hook to catch small animals in the water.

The water fly is an expert swimmer, it uses a jet type, as long as the abdomen is compressed, the water will be sprayed back, and the body will naturally rush forward, and the speed is extremely fast. Breathe through the gill of the rectum. When the water fly grows up, it climbs a branch or stone protruding from the water, and it grows into an adult dragonfly like a flying dragon in the air.

The image point says: Dragonfly dot water is in the laying of eggs.

First of all, it is important to understand that although dragonflies are insects that live on land, their larvae live in the water.

Secondly, in order to reproduce their offspring, they must choose to lay their eggs in a place where there is water, and the fertilized eggs must be in the water before they can hatch.

Eventually, the dragonfly uses its tail to drain the fertilized eggs into the water, where the eggs attach to the aquatic weeds and soon hatch larvae.

This is a female dragonfly laying eggs. "Dragonfly water" is a natural part of dragonfly's life – laying eggs and reproducing offspring.

Because the speed at which the dragonfly flies is the same as the speed of the water wave, then every time the dragonfly touches the water, it will be on the edge of the previous water wave, and the second water wave and the first water wave are moving at the same speed, so each circle should be inscribed

So choose A

Hello dear, I'm glad to answer for you, dragonfly water refers to the phenomenon of dragonflies passing quickly in the water. In reality, the dragonfly does not really stay or walk in the water, but takes off again by quickly touching the surface of the water. Dragonflies have a pair of long, thin wings that can generate a lot of lift.

When the dragonfly approaches the surface of the water during flight, it can quickly adjust the attitude and rhythm of its wings, so that the wings are in contact with the water surface. Through this contact, the dragonfly can harness the tension and drag on the surface of the water to create a reaction force that will help it take off again.

The phenomenon of dragonflies dotting the water is actually dragonflies laying eggs in the water. Most dragonflies have to lay their eggs in a watery environment because their fertilized eggs must be in the water to hatch, which is why we often see dragonflies in the water. This is mainly due to the fact that dragonfly larvae need to live a crawling life in the water for a long time.

In order to reproduce, the female dragonfly uses her tail to water the fertilized eggs and attach them to the aquatic plants in order to hatch larvae. Dragonflies have well-developed compound eyes, and they look for the water environment by observing the reflections formed by the water surface, and then complete the hereditary spawning.

When the dragonfly lays its eggs, the female dragonfly will have the male dragonfly grasp the back of her abdomen and "string together". Usually lay eggs on aquatic plants by small rivers and ponds, and the larvae hatched on aquatic weeds after the eggs are discharged are called "water flies", and water flies have to live a long crawling life in the water, at least one year, and at most seven or eight years before they can emerge as adults. When an adult worm grows into a short, fat belly, it becomes more and more elongated, and the wings that were originally stacked together become small dragonflies one by one.

1. Introduction to Dragonfly Water.

Dragonfly dot water, a Chinese idiom, pinyin is qīng tíng diǎn shuǐ, which means the action of a dragonfly touching the surface of the water with its tail when it flies on the surface of the water. The metaphor is superficial and not deep; Also described as a gentle kiss.

Dragonfly water comes from Tang Dufu's "Qujiang" poem 2: "Wearing flowers and butterflies are deeply seen, and dragonflies are flying in the water." Meaning: But I saw butterflies shuttling back and forth in the depths of the flowers, dragonflies flying on the surface of the water, and occasionally touching the water.

Second, the dragonfly points to the water to form a sentence.

To do learning, you must calm down and study deeply, and you will not gain anything from a little water.

The beautiful little swallow will fly across the lake like a dragonfly for a while, fly into the distance like a bow and arrow off the string, and stay on the green lotus leaves for a while.

The factory director went to the workshop once a day, but it was just a dragonfly to point water, but in fact, he didn't find any problems.

His review is just a drop in the pan. <>

This is the phenomenon of female dragonflies laying eggs after mating.

The origin of "Dragonfly Point Water":1, Tang Dufu "Qujiang" poem 2: "Wear flowers and butterflies to see deeply, and dragonflies fly in the water." "It is said that dragonflies fly on the surface of the water to lay eggs, and their tails start when they touch the water.

2, Song Yanshu "Fisherman's Pride" words: "The tender green can be cut red and want to bloom, and the dragonflies point to the waterfowl swimming." ”

3, Qing Wenkang's "The Legend of Children's Heroes" Chapter 28: "The two newcomers here come and go in the new house, like butterflies wearing flowers; If you want to leave, you want to leave, like a dragonfly dotting water. ”

Why do dragonflies order water? What is the purpose of the dragonfly?

The main reason for the dragonfly is to reduce drag, increase speed, and improve flight efficiency.

Dragonfly touching the water refers to the dragonfly only lightly touching the surface of the water during gliding and flying, as if it "clicked" the surface of the water. Why do dragonflies do this? This is because dragonflies need to overcome air resistance during flight, and when flying above the water surface, the air resistance will be very high, whereas the body of dragonflies is very light and can easily be slowed down by air resistance, resulting in a decrease in speed.

Therefore, by touching the water by the dragonfly, the air resistance above the water surface can be reduced, and the forward flight can be accelerated, and the flight efficiency can be improved.

In fact, the principle of dragonflies touching the water is very similar to the phenomenon that often occurs in many animal movements, such as the zigzag gliding of sharks when swimming, the gliding of birds, etc., all to reduce drag, increase speed, and reduce energy consumption.

Specifically, there are two main mechanisms of dragonfly dotting water:

The first is liquid surface tension. We know that there is a certain force of attraction between the water molecules, creating a surface tension. When a dragonfly lightly touches the surface of the water, its toes make contact with the surface of the water and take a layer of water molecules with it as it leaves.

As a result, tiny ripples are formed, called "ripples", and the ripples begin to spread outward from the dragonfly's toes.

Due to the effect of liquid surface tension, the ripples will exert an attraction on the surrounding water molecules, forming a pit-like water surface shape. During the flight, the dragonfly will exert its speed to the maximum, and the repeated use of this ripple during the flight can reduce air resistance and improve flight efficiency.

The second is the special environment of ultra-low-altitude flight. Dragonflies are smaller in size and weigh less, making them susceptible to air resistance during flight. However, if you fly very close to the surface of the water, you can take advantage of the interaction between the air flow lines and the surface of the water to slow down the drop in speed due to drag.

This flight mode requires dragonflies to have strong control capabilities, which can accurately judge the sea surface altitude and its own attitude during flight, and make adjustments accordingly.

Finally, it should be pointed out that although dragonfly water is a very common phenomenon, the specific mechanism and principle are still being studied and explored. Further research on dragonflies can provide inspiration for the design of more efficient aircraft and sports devices, and can also help people better understand the mysteries of the natural world.