aphercotropism

English

aphercotropism (uncountable)

(obsolete, biology) The movement or growth of an organism away from an obstruction.
- 1899, The Selborne Magazine, volume 10, Selborne Society, page 14:
  Aphercotropism.— “Turning away from an obstruction” is a peculiarity discovered by Darwin. His experiment was as follows:— after allowing a radicle to be well developed in peas, beans, &c, the seed is suspended in the air. A tiny piece of card is attached to one side of the tip by a little gum; the tip will now move away from the vertical position, on the opposite side to the card. The tip may make one or more complete circles in a vertical plane; and it has been known to pass through the first loop so as to tie itself into a knot.

单词	aphercotropism
释义	aphercotropism English Noun aphercotropism (uncountable) (obsolete, biology) The movement or growth of an organism away from an obstruction. 1899, The Selborne Magazine, volume 10, Selborne Society, page 14: Aphercotropism.— “Turning away from an obstruction” is a peculiarity discovered by Darwin. His experiment was as follows:— after allowing a radicle to be well developed in peas, beans, &c, the seed is suspended in the air. A tiny piece of card is attached to one side of the tip by a little gum; the tip will now move away from the vertical position, on the opposite side to the card. The tip may make one or more complete circles in a vertical plane; and it has been known to pass through the first loop so as to tie itself into a knot. Anagrams spermatophoric
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