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Plant evolution is an aspect of the study of biological evolution, predominantly involving evolution of plants suited to live on land, greening of various land masses by the filling of their niches with land plants, and diversification of groups of land plants.
Some garden flowers originated as weeds in cultivated fields and have been selectively bred for their garden-worthy flowers or foliage. An example of a crop weed that is grown in gardens is the corncockle , ( Agrostemma githago ), which was a common weed in European wheat fields, but is now sometimes grown as a garden plant.
The plant is particularly significant during the Double Ninth Festival. [citation needed] Chrysanthemum cultivation in Japan began during the Nara and Heian periods (early 8th to late 12th centuries), and gained popularity in the Edo period (early 17th to late 19th century). Many flower shapes, colours, and varieties were created.
Shavuot by Moritz Daniel Oppenheim. In many Jewish communities, there is a custom to decorate homes and synagogues with flowers on Shavuot. Some synagogues decorate the bimah with a canopy of flowers and plants reminiscent of a ḥuppah, as the giving of the Torah is metaphorically seen as a marriage between the Torah and the people of Israel.
Anton Lang showed that several long-day plants and biennials could be made to flower by treatment with gibberellin, even when grown under a non-flower-inducing (or non-inducing) photoperiod. This led to the suggestion that florigen may be made up of two classes of flowering hormones: Gibberellins and Anthesins. [ 18 ]
Pollen itself is not the male gamete. [4] It is a gametophyte, something that could be considered an entire organism, which then produces the male gamete.Each pollen grain contains vegetative (non-reproductive) cells (only a single cell in most flowering plants but several in other seed plants) and a generative (reproductive) cell.
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