Do sunflowers that follow the sun during the day really shake their heads back to their original pos

Of course, the sunflower doesn't shake its head back to its original position at night, and of course, it doesn't want to scare you, let alone sprain its neck. It's a joke, and the answer is yes, it will go back to where it was, but not by shaking its head.

First of all, you need to be clear that not all sunflowers will follow the sun. Only unripe sunflowers follow the sun, and they don't follow the sun every day. There is a hormone in the plant that regulates the growth and development of plants called auxin, and the position of the appropriate concentration of auxin can promote the growth of the plant, and the reason for the rotation of sunflowers is mainly due to the uneven distribution of auxin.

Appropriate concentrations of auxin are distributed in the young sunflower stalks, and the distribution of auxin is mainly affected by sunlight and gravity. When there is light, light has a greater regulatory effect on auxin, and plants show phototropism. When sunlight comes from one side, there is less light on the other side, and auxin is piled up on the less lit side, so that the stem on the backlit side grows faster, and the stem bends, so that the flower disc is in the direction where the light is coming from.

But at night, the light factor disappears, and gravity takes over. The auxin that was originally piled up on the backlit side sinks to the lightward side due to gravity, so that the light-facing side, which grows slower during the day, grows faster at this time, so the sunflower slowly raises its head at night and returns to the eastward direction. Of course, the flower disc does not rotate every day, and if it turns at a large angle one day, then it may have to stop for a few days and continue to follow the footsteps of the sun.

Mature sunflowers generally do not continue to rotate with the sun, and they generally maintain a steady eastward direction until the flower disc is fully ripe.

Sunflowers follow the sun during the day, how do they turn back at night? Is it really by shaking your head violently?

It itself contains a special auxin, afraid of light, mainly distributed on the tip of the stem, so when there is sunlight, it will be back, and the backlit side will grow and reproduce rapidly, and the light side will grow slower, and over time it will bend. In addition, it is also related to xanoxide and gravity, which can hinder cell growth, and the content of the sunny side is high. Gravity means that the early and tender stages of growth will rotate with the sun, but the later stages will not.

The sunflower does not turn its head sharply at night, it turns slowly back after the sun sets, because without light its auxin will change, redistribute, and force it to turn back. Wait until about three o'clock in the morning to start heading east, waiting for the sun to slowly rise. This phenomenon is mainly before the flowers are fully bloomed, and when they do, they will no longer rotate and will always face east.

1. No, only in the budding stage, the sunflower gets its name because it often faces the direction of the sun. However, sunflowers only rotate with the sun when they are in the bud stage, and the phenomenon of "sunflowers blooming towards the sun" can only be seen in the pure stage of early blooming. When the flowers are fully open and begin to bear fruit, the sunflowers are largely immobilized.

2. Sunflower (scientific name: Helianthus annuus L.）：

It is a plant of the family Asteraceae, the genus Sunflower. It is named because the inflorescence rotates with the sun. The annual herbaceous ant stares at spring, tall and can reach up to 9 meters tall.

The stems are erect, rounded and angular, stiff and covered with coarse white bristles. The broadly ovate leaves are usually alternate, apex acutely or acute, with 3 veins at the base, coarsely serrated margins, rough on both sides, hairy, and long-stalked. Capitate inflorescences, 10-30 cm in diameter, solitary at the top of the stem or at the end of the branch.

The bracts are multi-layered, leafy, tile-like, covered with stiff hairs, flowering in summer, with neutral yellow tongue-like flowers at the margins of the inflorescences, not bearing fruit. The inflorescence is tubular with amphoteric tubular flowers, brown or purple, and can bear fruit. Rectangular ovate achenes, the pericarp lignified, gray or black, called sunflower seeds.

Sunflowers don't always follow the sun around, because when there is sunlight, the sunflower will slowly rotate with the sun, and when the sun goes down, the auxin it contains will be redistributed again, so it will turn back to its original position.

1. Why towards the sun.

It itself contains a special auxin, which is photosensitive to locust and is mainly distributed on the tips of stems. So as soon as the sun shines, it turns back, and the backlit side grows and multiplies very quickly, while the light-facing side grows very slowly, and over time it bends. In addition, it is also related to lutein and gravity.

Xanoxylin can hinder the growth of cell bridges, and the xanthoxylin content is high on the sunny side. Gravitational attraction means that it rotates with the sun in the early stages of growth and juvenile stage, but not in the later stages.

Second, whether you will turn back sharply at night.

Sunflowers don't look back at night. It slowly retracts after the sun goes down because its auxin changes in the absence of light, redistributing, forcing it to retract. Around three o'clock in the morning, it starts to face east, waiting for the sun to slowly rise.

This phenomenon is mainly before the flowers are fully bloomed, and after they bloom, the Min Grip pie will not turn anymore and will always face east.

1 All sunflower auxin is formed mainly at the tip of the shoot and transported to the base. The distribution of auxin is affected by light. Bear.

Changsu prefers shady places. Therefore, the stem of the sunflower has more auxin on the side of the sun, and it grows fast and towards.

The sunflower flower disc is facing the sun. I went to look at the sunflowers again, and sure enough, I saw the sunflower with the sun's stem on its back.

The side grows long. But I have another question: since the sunflower disc turns with the sun, when it comes to sunset, it.

It's west-facing. So, how could it be facing east at sunrise the next day? I went to consult with a science teacher.

Only then did I clearly understand that after the sunset, the sunflowers will slowly turn straight by themselves at night, and until the early morning of the next day, too.

Before the sun comes out, it begins to slowly turn to the east to meet the rising sun. Also learned from the science teacher: sunflowers.

It is the seedlings, stems, leaves, and flower disks that rotate with the sun, and the sunflower stems until the flower plate sets seeds.

The products of photosynthesis in the stalk are concentrated in the flower disc at an accelerated pace, the stalk becomes rough and hard, the leaves turn yellow, and chlorophyll.

Fade away, photosynthesis tends to stop, and the flower disc is fixed towards the east and no longer rotates with the daylight.