Everything About Plants and Its Importance

1. Everything About Plants and Its Importance BY SOUVIK ROY

2. Some Fact On Plants 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.

3. Definition 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.

4. Types of Plants • The earliest plantshad 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.

5. Fern: • Ferns reproduce differently from the flowering plants that bear seed. Under a fern frond or leaf, are often found rows of small brown dots called sporangia. Inside these sporangia, spores develop and release into the air when they are ripe. Fallen spores sprout into tiny, often heart-shaped plants that anchor themselves in the ground with root-like rhizoids. Under their leaves are separate structures where eggs and sperm develop and mature. Rain swells the sperm structures and they burst, releasing flagellated • : sperm that travel to the egg in water droplets.

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