Phototaxis of animals and plants, what does phototaxis of plants look like

Ask about the phenomenon? Plants grow towards the light: morning glory vines spread towards the light, sunflower inflorescences turn to the sun...The example of animals is not easy to mention, is it considered that skinks (a type of lizard) are exposed to the sun at noon in the middle of summer? But it seems that the main purpose is to raise the body temperature...

Phototaxis is the habit of organisms to move closer to or farther away from light. In the DAO

In the plant kingdom, this habit is often found in migratory plants that can be found in chloroplasts, such as migratory algae of various algae, migratory green algae, dinoflagellates, dinoflagellae, etc. In the animal kingdom, the moth to the fire is a typical example. Biophototaxis is a type of biological stress that is the result of long-term natural selection.

In the plant kingdom, migratory plants with chloroplasts are often found, such as migratory green algae, migratory seeds of various algae, dinoflagellates, diflagellates and red bacteria are obvious examples. Cyanobacteria, diatoms, and tympanic algae that do not have flagella that rely on gliding movements, and even the mobile bodies of cellular slime molds have this property. Euglena and the like use eyespots to sense light, mutants that lack eyespots and Diflagellates, which do not have eyespots in the first place, still have phototaxis.

The phenomenon of growth bending caused by unidirectional light irradiation of plant growth organs is called phototropism. Phototropism puts the stems and leaves of plants in the most suitable position for the use of light energy, which is conducive to receiving sufficient sunlight and photosynthesis.

Biotaxis is the tropism of an organism towards or away from light. In the plant kingdom, it can often be found in migratory plants with chloroplasts, such as the migratory seeds of various algae, migratory green algae, dinoflagellates, dinoflagellates, etc. In the animal kingdom, the moth fighting a fire is a typical example.

Nocturnal insects such as moths, cicadas, and beetles are mostly phototaxis.

The mountains are not tired of being high, and the sea is not tired of being deep; Zhou Gong vomited and fed, and the world returned to the heart.

From the figure, it can be seen that the shadow of the tree is located in the northwest of the tree, that is, the sun is located in the southeast of the tree at this time, and it is inferred that it is before noon in the local area at this time, and options C and D are excluded Assuming that option A is correct, it means that this time is summer, and the sunrise in the northeast is from sunrise to 4 o'clock in the local area, and the sun is located in the southeast position, indicating that the day is longer than 16 hours, which is obviously much longer than the summer solstice day in northwest China, which is not in line with geographical facts, so the assumption is not valid, and option A is wrong Therefore, choose B

The shape of the cotyledons is oval, the shape of the true leaves is lanceolate, the shape is pale yellow in the dark, the stem shape is erect under light, the upper part is pale green, the lower part is lavender, and the mung bean sprouts that are usually eaten are pale yellow.

Those that tend to the light source have positive phototaxis, and those that deviate from the light source have negative phototaxis.

Nocturnal insects are mostly very phototaxis, such as nocturnal moths and beetles. Among them, "moths to fire" is the most well-known.

Modern research suggests that the phototaxis of nocturnal insects is related to their navigation style. They usually use the moon as their navigation coordinates and fly not perpendicular to the moonlight, but obliquely; The lights will make them mistake for the moon, and they will fly towards the lights in a spiral asymptote trajectory. We sometimes misread the phototaxis of insects!

In particular, moths fight fires, and we think that insects like to chase light, but in fact, this is a misunderstanding for thousands of years.

In the dark night, the moth can't see the surrounding situation clearly, and when it can't find a suitable reference, how can it not take the wrong road, and how fast and economical can it fly?

There is currently no accepted correct explanation for phototaxis. Even if you ask an optian, you won't get a definitive answer. While there are many hypothetical explanations, none of them can answer this question perfectly.

First, they are nocturnal animals. This one is obvious, and it is not clear to see even if there is a moon during the day. Second, they must be migratory so that there is a need for long-haul flights.

All in all, they are all starry night travelers. In order to maintain a stable orientation during long flights, they employ the method of keeping the direction of flight at a constant angle to the moon. Artificial light sources can be mistaken for moonlight by them, disrupting their navigation systems.

This theory could explain why some insects continue to change direction of flight when they are close to a light source.