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E-book Introduction to Botany
Botany is the scientific study of plants and plant-like organisms. It helps us understand why plants are so vitally important to the world. Plants start the majority of food and energy chains, they provide us with oxygen, food and medicine. Plants can be divided into two groups: plants1 and plants2. Plants1 contain all photosynthetic organisms which use light, H2O, and CO2 to make organic compounds
and O2. Plants are defined ecologically (based on their role in nature). Some plants1 can be bacteria or even animals! One example of this a green slug, Elysia chlorotica (see Fig. 1.1). Green slugs collect chloroplasts from algae and use them for their entire life as food producers. Therefore, green slugs are both animals and plants. Plants are all organisms from Vegetabilia kingdom. Normally, plants2 are green organisms with a stem and leaves. We can define them also as multi-tissued, primarily terrestrial and photosynthetic eukaryotes. This definition is taxonomical (based on evolution).
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