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Plants especially green plants are multi cellular eukaryotes of the kingdom planate; along with flowering plants conifers and other gymnosperms ferns clubmosses hornworts liverworts mosses and green algae. Green plants have cell walls with cellulose and obtain most of their energy from sunlight through photosynthesis. Some plants are parasitic and have lost their ability to produce required amounts of chlorophyll or to photosynthesis. Botany is the scientific study of plants and is a branch of biology. Green plants provide most of the world’s molecular oxygen and form the basis of most of the earth’s ecologies; especially on land. Plants that produce grains fruits and vegetables form mankind’s consumption. Plants are used as ornaments and have served as the source of most medicines and drugs in the past.
Through photosynthesis most plants use sunlight to convert carbon dioxide from the atmosphere plus water into simple sugars. These sugars are then used as building blocks and form the main structural component of the plant. Parasitic plants on the other hand use its host to grow. Some plants grow using oxygen dissolved in the surrounding water and a few specialized vascular plants like mangroves can grow with their roots in anoxic conditions. Molecular biology are revolutionizing the study of plants and will be used to discover the mechanisms of development and to control such processes. This book explores plant biology in depth.
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