Outlines of Evolutionary Biology
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In our eReader you can find the full English version of the book. Read Outlines of Evolutionary Biology Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Outlines of Evolutionary Biology
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In the higher plants the spores, as agents of dispersal, are replaced by seeds, which, usually still within the fruit, maybe carried on the wind, floated on rivers or ocean currents, carried about entangled in the hair or feathers of animals, or actually eaten and passed out uninjured in the faeces. A great many seeds and fruits are specially modified in structure to secure their distribution in one or other of these ways, and the study of such adaptations consti- tutes one of the most interest...ing chapters in botanical science. We need only refer here to such fruits as the blackberry, whose succulence tempts the birds to eat them and carry the seeds, safely enclosed in their hard protective envelopes, to long distances ; the various kinds of burs with their hooks for entangle- ment in fur and feathers ; the winged fruits of the maple, elm and ash, and the thistledown of the thistles, adapted for floating on the wind.
The dispersal of plants is in all cases passive and dependent on external agencies, though sometimes aided by some purely mechanical device in the plant itself ; in the case of animals it may take place either passively or actively, by the exertions of, the animals themselves.
What to read after Outlines of Evolutionary Biology?
You can find similar books in the "Read Also" column, or choose other free books by Arthur Dendy to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
In the higher plants the spores, as agents of dispersal, are replaced by seeds, which, usually still within the fruit, maybe carried on the wind, floated on rivers or ocean currents, carried about entangled in the hair or feathers of animals, or actually eaten and passed out uninjured in the faeces. A great many seeds and fruits are specially modified in structure to secure their distribution in one or other of these ways, and the study of such adaptations consti- tutes one of the most interest...ing chapters in botanical science. We need only refer here to such fruits as the blackberry, whose succulence tempts the birds to eat them and carry the seeds, safely enclosed in their hard protective envelopes, to long distances ; the various kinds of burs with their hooks for entangle- ment in fur and feathers ; the winged fruits of the maple, elm and ash, and the thistledown of the thistles, adapted for floating on the wind.
The dispersal of plants is in all cases passive and dependent on external agencies, though sometimes aided by some purely mechanical device in the plant itself ; in the case of animals it may take place either passively or actively, by the exertions of, the animals themselves.
What to read after Outlines of Evolutionary Biology?
You can find similar books in the "Read Also" column, or choose other free books by Arthur Dendy to read onlineMoreLess
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