Everything About Plants and Its Importance

Plants are one of the most crucial living organisms on earth. They are helpful to man and animal for living on Earth. They produce oxygen that is crucial for the survival of living organisms. Trees provide shelter for animals and are also known for their medicinal benefits.

Defination Of plants

Plants are multicellular organisms in the kingdom Plantae that use photosynthesis to make their own food. Most paleobotanists believe that land plants evolved about 430 million years ago from predominantly freshwater green algae. Living members of these groups seem more evolved today, so it is assumed that some of their traits were developed after they transitioned to land. Primitive Trees were simple structures that did not look like modern plants.

Types of Plants

The earliest plants had upright stems but no roots and leaves, to say nothing of flowers, a development that would come much later. Nonflowering plants fall into two groups: bryophytes and vascular plants. Bryophytes lack a system for the transport of water and food.

They tend to be small and lack true roots. They photosynthesize and mostly reproduce by means of alternating nonsexual and sexual generations, in fashion similar to the ferns. Early nonflowering vascular plants include the ferns and horsetails. These plants reproduce by means of spores

and alternating generations. Also included in this group are the gymnosperms ("naked seeds"), plants whose seeds are not enclosed, as in flowering plants, but sit on the scales of cones. Conifers, including pines, firs, and spruces, create both male and female cones. The male cone makes fine pollen that is blown onto a female cone and unites with an egg inside, producing a seed. When the seeds ripen, the scales loosen and spread out, allowing the seeds to disperse. Some 200 million years ago, gigantic gymnosperms formed the dominant tree life on Earth. As such, they also satisfied the appetites of the Jurassic herbivores.

Various Type of Plants and their origin

A number of trees today appear little changed from their prehistoric predecessors: mosses, horsetails, and ferns. found especially in moist environments, for example. Others are found among the cycads, a group that goes back 245 million years. Cycads have a columnar trunk and a crown of leaves, much like a palm tree, and are either male or female. They are found in the tropics and sub-tropics of both the Eastern and Western Hemispheres. Both sexes of cycads in most species bear outsize cones. To- day’s ginkgo, a lone survivor of a once

large group no longer appears in the wild. It formerly was limited to southeastern China, although as a cultivated plant it is known worldwide. Gingkos shaped leaves. By about 380 million years ago, are recognized by their clusters of fan-plants were diversifying into the forms we know today. As specialized tissues to transport water and nourishment and provide strength in the stems developed, tree-size and treelike species were able to thrive. Seed like structures soon appeared, leading to the development of flowering plants.

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