What were plants like in the age of dinosaurs?

The Jurassic period of the age of dinosaurs was the heyday of dinosaurs, and dinosaurs that emerged and began to develop during the Triassic period have quickly become the rulers of the earth. All kinds of dinosaurs come together to form a world of dragons in various forms. At that time, in addition to the Brontosaurus and Diplodocus with huge bodies on land, ichthyosaurs and flying pterosaurs in the water also developed and evolved in large numbers.

The appearance of birds represents another important event in the evolution of vertebrates. The fossil "archaeopteryx" found in 1861 in the Late Jurassic strata of Sorenhofen, Bavaria, Germany, is recognized as the oldest representative of birds; In recent years, the fossil of "Sinosauropteryx" discovered by Chinese paleontologists in Liaoning Province has received extensive attention from the international academic community, providing new and important materials for the study of the origin of feathers and the origin and evolution of birds. With the advent of birds, vertebrates occupied the three major ecological domains of land, sea and air for the first time.

Jurassic insects are more diverse, with more than 1,000 species of insects living in forests and near lakes and swamps. In addition to cockroaches, dragonflies, and beetles, there are also grubs, tree lice, flies, and borers. The vast majority of these insects have survived into modern times.

In the plant communities of the Jurassic, cycads, pines and ginkgo biloba in gymnosperms. Extremely prosperous. Among the ferns, horsetails, true ferns, and dense pines and cypresses, together with ginkgo biloba and arbors, form a dense forest, while herbaceous sheep's teeth and other grasses are scattered all over the lowlands, covering the ground.

In the drier areas, cycads and sheep's teeth grow, forming vast evergreen fields. Before the Jurassic, the flora of the earth was more distinct, and due to migration and evolution, the appearance of the Jurassic flora tended to be similar in all regions of the earth, indicating that the climate of the Jurassic was generally similar. Scientists at the University of York in the United Kingdom say that global warming in the next century will lead to the reappearance of the "age of dinosaurs"!

As the Earth's temperature continues to rise, it will reach the climate temperature of the age of the dinosaurs, and by that time at least half of the planet's species will be wiped out! Chris Thomas from the University of York in the United Kingdom pointed out at the annual British Association for the Advancement of Science that "within the next 100 years, not only will the carbon dioxide index reach the highest record in 24 million years, but the average global temperature will reach the highest temperature in 10 million years." The Earth is likely to be on the verge of mass extinction.

It is understood that scientists predict that global temperatures will increase by 2-6 degrees Celsius by 2100. <>

This has a somewhat very high correlation with global warming. This phenomenon is not only experienced by reptiles, birds and insects, but also by vegetation ecology. For example:

Fungal blooms caused by climate change have now led to the disappearance of one percent of the planet's amphibian species. Thomas points out that not only are many species unable to find suitable habitat, but they also have to deal with invasive species that are forcing them out of their territory. As the climate warms, many species on Earth will not only become extinct, but will also form an unprecedented mix of species, and the diversity of species will gradually disappear.

This change is faster than the evolution of species. 100 years is a short moment in geological time. <>

The main reason for this is the emission of large amounts of greenhouse gases such as carbon dioxide into the atmosphere from fuels used for transportation and power. "If this radical climate prediction comes true, the Earth will return to the climate of the age of the dinosaurs, an environment that life on Earth has not encountered for millions of years." As a result, no single organism can fully adapt to this climate.

In the coming century, 10-99% of Earth's species will face the final stage of survival in evolutionary history, which will lead to the complete disappearance of 50% of Earth's species. According to Thomas, scientific observations through climate models** show that 80 percent of the planet's species have changed their traditional ranges to adapt to changing climate conditions. <>

Everyone knows about Triceratops, and when it comes to Triceratops, his definition is that it is huge. But have you noticed that in that era, not only Triceratops, but also other microbial strains and even green plants grew larger than now? For example, the plants of the dinosaur period, there were more gymnosperms in the dinosaur era, the alder is also very tall, 30 meters long, the pine and cypress and cherry trees are 60-80 meters long, and some small animals are larger than the size of the Tyrannosaurus rex.

For example, the mammoth was a large mammal that lived during the Cold Era, and 500 million light years ago, land chocosurfers inhabited the territory of present-day Uzbekistan. Why are they so big?

Authoritative expert: Why were the animals and plants of the dinosaur period much larger than they are now? The key to O2 is O2, about 100 million years ago, when there was a violent outbreak of supervolcanic fitness on Earth; Supervolcanoes contributed to a surge in carbon dioxide levels on the planet at that time, contributing to global warming.

Then, the whole earth soon became a cold, wet and humid "tropical rainforest", and the increase in plant species led to the discovery of an unusually diverse amount of oxygen in the atmosphere on land at that time, about twice as much as it is today, which also brought a lot of food to many large and medium-sized herbivores at that time. This living environment can be said to be a combination of temperature and oxygen, which derives a larger microbial strain.

The plants of the age of dinosaurs, especially those tall green plants, are generally dominated by gymnosperms, such as this tall tree: pine and cypress trees, pine and cypress trees, alders, and a kind of flower and plant that everyone must grasp, that is the cherry tree, the origin of the ginkgo tree but will be earlier than the origin of the triceratops. But what we often say about pine and cypress trees and pine and cypress trees do not refer to a specific green plant, but a species, for example, pine and cypress trees refer to pine plants, pine and cypress trees refer to cypress plants, and they contain a variety of other green plants.

For example, there are 150 species of cypress plants and 80 species of pine plants.

However, the largest flowering plant in the pine family can reach 80 meters, but the juniper is larger in the cypress family, and the absolute height can be 12 meters long, which will be much shorter than the sugar pine. It goes without saying that the pine family green plants and the cypress family green plants are not the largest, what is the biggest? It is a green plant of the cedar family, and the largest of the cedar plants belongs to the redwoods.

Today, the world's tallest plant is the North American redwood, which is tall and straight, and the largest is guaranteed to be 110 meters long, and you can imagine that the plants of the dinosaur era could be up to 100 meters long.

The first point is that the tallest plant in the age of dinosaurs is about 10 meters very tall, and the second point is that the age of dinosaurs belongs to this kind of prehistoric civilization, and there is a lot of essence.

This plant is more than 20 meters tall, and the age of dinosaurs belongs to prehistoric civilizations, but also belongs to the Jurassic era, and dinosaurs were also the overlords of the earth.

The tallest plants can reach more than 50 meters; Yes, they do belong to prehistoric civilizations.

First, the tongue and sheep's teeth

Tongue sheep tooth is a plant endemic to the Gondwana flora from the Late Paleozoic to the Early Mesozoic, and is rarely found in the Early Jurassic. Tongue sheep's tooth is an arbor-like deciduous plant, up to 4 meters high, the main stem has obvious growth rings, the single leaf is lanceolate or inverted-lanceolate, the leaves have obvious middle leaf veins, and there are also some lateral veins that form long polygonal single mesh, and the leaves are sheep's tongue-shaped, so it gets its name.

Second, the cycad in Benne

The Bennecycad is a plant that lived from the Triassic to the Oligocene. The stem of the cycad is relatively thick and short, covered by the leaf base of the remaining petioles, some branches are weakly branched, the surface is smooth, and the cycads are amphoteric flowers, apical, or distributed around the columnar stem.

Three, alder

Alder is an ancient fern, a precious tree species left over from the Cretaceous century, about 300 million years ago. The stem of Alder is more than 6 meters high, about 10-20 cm in diameter, the leaves are arranged in a spiral shape at the top of the stem, the leaves are relatively large, the shape is oblong and round, the three pinnate deep lobes, the pinnae have 17-20 pairs, alternate.

Fourth, seed ferns

Seed ferns appeared in the Late Devonian and became extinct in the Cretaceous. Seed fern is a primitive seed plant that has seeds, but no embryo, and although it has pollen grains, it cannot flower.

1.Tongue Sheep's Tooth: Tongue Sheep's Tooth is an arbor-like deciduous plant with a single leaf lanceolate or inverted-lanceolate, and the leaves are sheep's tongue-shaped.

2.Bennecycad: Bennecycad survived from the Triassic to the Oligocene, with a stubby stem and bisexual flowers.

3.Alder: Alder is a precious tree species left over from the Cretaceous Century.

4.Seed fern: Seed fern appeared in the Late Devonian and became extinct in the Cretaceous and is a primitive seed plant.

5.Cycads: Cycads are gymnosperms, dioecious.

1.Angiosperm.

2.Fern.

Correct Answer: Angiosperms.

The Jurassic period was the heyday of dinosaurs, and dinosaurs that emerged and began to develop in the Triassic period quickly became the rulers of the earth. All kinds of dinosaurs come together to form a world of ascending dragons.

The best available evidence of fossilized pollen grains and leaves suggests that angiosperms originated in the Early Cretaceous period, about 100 million years ago. In the older Cretaceous sediments, the angiosperm fossil record pales in number with fossils of ferns and gymnosperms. The Cretaceous period is after the Jurassic.

Dinosaurs ate ferns, or the young leaves of cycads, a dwarf, palm-like plant, which was the most widely distributed tree species in the Mesozoic Era, duck-billed dinosaurs ate leaves, branches, pine needles, and pine nuts, etc., the time and environment in which dinosaurs survived, and plant-eating dinosaurs ate different types of things. Dry talk.

Dinosaurs (scientific name: dinosauria) were found in the Mesozoic era (Triassic, Jurassic, and Cretaceous) periods, and they mainly inhabited woodlands or open areas on lakeshore plains (or coastal plains). In 1841, the British scientist Richard Owen [2] studied several fossilized lizard bones and named them dinosaurs, which means "terrifying lizards".

Dinosaurs are a general term for a class of reptiles with sturdy limbs, long leaden tails, and a large body. In terms of eating habits, there are docile herbivores and ferocious meat eaters, as well as omnivorous dinosaurs that eat both meat and vegetables.