When did plants appear, when did plants appear on the earth, and how many years according to today

Millions of years ago, there were hundreds of plants, but insects appeared first, and you can look up this in botanical theory.

Cyanobacteria (or cyanobacteria) appeared on Earth 3,533 billion years ago, and were the first organisms to derive energy from sunlight through photosynthesis, and can also be considered to be the first plants to appear.

From 50 million years after the birth of the earth to the present, there have always been plants, and you say how many plants there are on the earth.

The first land plants appeared 700 million years ago.

It can only be said that it is a plant group, the first to appear is algae plants, it has a simple structure, there are single-celled, multi-cellular, there is no differentiation of rhizomes and leaves and other organs, like kelp and seaweed, the individual is large, and there is only a difference between roots and phylloids.

Kelp cultivation.

The Earliest Plants: Who are the ancestors of the many green plants that live on Earth today? The study of geological history tells us that it is cyanobacteria.

It was the first green plant to appear on Earth. The earliest known fossils of cyanobacteria are found in paleosedimentary rocks in South Africa. This is evidence that there was life on Earth 3.4 billion years ago.

The appearance of ancient cyanobacteria is somewhat similar to that of modern cyanococcus.

The first plants to appear on Earth were algae that grew in the sea, about 3.2 billion years ago. The first terrestrial plants appeared 100 million years ago: at that time, due to the warm and humid climate on Earth, sheep's teeth began to appear on land.

This type of plant grows at first low on the ground, about 20 centimeters tall, its stems are very straight, and more interestingly, it has no roots, therefore, it can only grow in damp places. Later, sheep's tooth plants gradually developed into dry places. In order to survive, it grows roots and is becoming more and more developed.

With roots that absorb nutrients and water from the soil, these plants grow taller and taller, and as a result, tall forests of sheep's teeth cover the earth.

Algae are the oldest plants in the world, and they differ more than roses and palms. Among the 10,000 species of algae, there are single-celled green algae, freshwater grasses, and giant brown or red seagrasses.

Hello, the first plants to appear on Earth were algae that grew in the sea, about 3.2 billion years ago.

According to archaeological discoveries, the earth was originally an ocean, so the earliest plants on the earth were submarine plants, and now there are some ferns or corals in the sea, which exist on the earth.

Plant growth history! What kind of plant was the first Earth overlord?

Plants date back 2.5 billion years (Proterozoic), and the earliest plants in the history of the earth belonged to fungi and algae, and then algae flourished for a time. It wasn't until 438 million years ago (Silurian period) that green algae broke free from the constraints of the water environment and landed on the earth for the first time, evolving into ferns, adding green to the earth for the first time. 360 million years ago (Carboniferous), ferns became extinct, replaced by lycopodiums, cuneiformes, euferns and seed ferns, forming swampy forests.

The main plants of the Paleozoic era were almost completely extinct 248 million years ago (Triassic), and gymnosperms began to emerge, evolved pollen tubes, and completely broke away from their dependence on water, forming dense forests. 145 million years ago (Cretaceous) angiosperms (flowering plants) began to appear, and developed rapidly in the late period, replacing gymnosperms, forming the angiosperm era that continues to this day. Modern types of pine, cypress, and even metasequoias, redwoods, etc., were created during this period.

1. The age of fungi and algae plants.

For nearly 3 billion years, from 3.5 billion years ago to 400 million years ago (late Silurian period), plants on Earth were only primitive and inferior fungi and algae. Among them, from 351.5 billion years to the period of bacteria and cyanobacteria monopoly, this period is often called the bacteria-cyanobacteria era. It was only from 15 billion years ago that eukaryotic algae such as red algae and green algae appeared.

2. The age of ferns.

From 400 million years ago, some green algae evolved from the primitive terrestrial vascular plant, the gymnofern. Although they have no true roots and no leaves, they already have vascular tissues in their bodies and can live on land.

In the early and middle Devonian period, more than 300 million years ago, they experienced about 30 million years of landward expansion, and began to diverge in the direction of adapting to various terrestrial environments. In addition, bryophytes also appeared in the Devonian, but they did not form the dominant group of terrestrial vegetation at the beginning, and were only one side branch in the evolution of the plant kingdom.

Naked ferns became extinct at the end of the Devonian period, and were replaced by various ferns that evolved from them; By about 100 million years in the Permian, they became the protagonists of terrestrial vegetation at that time. Many tall tree-like ferns flourish, such as scales, reeds, seals, etc.

3. The age of gymnosperms.

From the Permian to the early Cretaceous, it lasted about 100 million years. Many ferns did not adapt to the changes in the environment at that time, and most of them became extinct, and the dominant role of terrestrial vegetation was replaced by gymnosperms. The most primitive gymnosperms (protogymnosperms) also evolved from gymnosperms.

The Mesozoic Era is the most prosperous period of gymnosperms, so it is called the Mesozoic Era as the era of gymnosperms.

Fourth, the era of angiosperms.

They are a group of plants that developed rapidly from the Cretaceous and replaced the dominance of gymnosperms. Until now, angiosperms are still the dominant group with the most species, the most extensive distribution and the strongest adaptability on the earth.

Throughout the occurrence and development of the plant kingdom, it can be seen that the entire plant kingdom has continuously occurred and developed through genetic variation, natural selection (and artificial selection after the emergence of humans), and has evolved along the laws from low to high, from simple to complex, from undifferentiated to differentiated, and from aquatic to terrestrial.

The species of the new laughing game are constantly being produced, and the species that do not adapt to the changes in environmental conditions continue to die and become extinct, and this long river of plant evolution will never stop and will never end.

Mosses, ferns: Paleozoic; gymnosperms: Mesozoic; Angiosperms: Cenozoic.

First of all, 2.5 billion years ago (Proterozoic), the earliest plants in the history of the earth belonged to fungi and algae.

Then, 438 million years ago (Silurian period), green algae broke free from the constraints of the water environment and landed on the earth for the first time, evolving into ferns.

Then, 360 million years ago (Carboniferous), ferns became extinct and replaced by lycopodium, cuneiformes, euferns, and seed ferns.

After that, the main plants of the Paleozoic era were almost completely extinct 248 million years ago (Triassic), and gymnosperms began to rise.

Finally, 145 million years ago (Cretaceous), angiosperms (flowering plants) began to emerge and rapidly developed in the late period, replacing gymnosperms, forming the angiosperm era that continues to this day.