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A hydroxide ion acting as a nucleophile in an S N 2 reaction, converting a haloalkane into an alcohol. In chemistry, a nucleophile is a chemical species that forms bonds by donating an electron pair. All molecules and ions with a free pair of electrons or at least one pi bond can act as nucleophiles. Because nucleophiles donate electrons, they ...
Botany is a natural science concerned with the study of plants.The main branches of botany (also referred to as "plant science") are commonly divided into three groups: core topics, concerned with the study of the fundamental natural phenomena and processes of plant life, the classification and description of plant diversity; applied topics which study the ways in which plants may be used for ...
Botany, also called plant science or phytology, is the branch of natural science and biology studying plants, especially their anatomy, taxonomy, and ecology. [1] A botanist , plant scientist or phytologist is a scientist who specialises in this field.
Begonia, for Michel Bégon (1638–1710), a French official and plant collector [27] [28] 2 genera, mainly throughout the tropics, extending into the subtropics [17] [29] Mostly perennial herbaceous succulents with unisexual flowers, with a few subshrubs and herbaceous plants up to 4 m (13 ft) tall. Some species grow on rocks, some on other plants.
Mimicry is an adaptation by a species, called the mimic, making it resemble something else, called the model, with the effect of deceiving another species, the dupe. The three are not always all distinct, as mimicry can for example be within a species. [3] The adaptation is to the evolutionary advantage of the mimic.
Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (/ ˌ æ n dʒ i ə ˈ s p ər m iː /). [ 5 ] [ 6 ] The term 'angiosperm' is derived from the Greek words ἀγγεῖον / angeion ('container, vessel') and σπέρμα / sperma ('seed'), meaning that the seeds are enclosed within a fruit.
Plants may bear either all bisexual flowers (hermaphroditic), both male and female flowers (monoecious), or only one sex (dioecious), in which case separate plants are either male or female flower-bearing. Where both bisexual and unisexual flowers exist on the same plant, it is called polygamous.
As an example, consider Siehe's Glory-of-the-Snow, Chionodoxa siehei: Flowers of Chionodoxa siehei, which can also be called Scilla siehei, or included in Chionodoxa forbesii or in Scilla forbesii. Taxonomists can disagree as to whether two groups of plants are sufficiently distinct to be put into one species or not.