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The production of silk originated in China in the Neolithic period, although it would eventually reach other places of the world (Yangshao culture, 4th millennium BC). Silk production remained confined to China until the Silk Road opened at some point during the latter part of the 1st millennium BC, though China maintained its virtual monopoly over silk production for another thousand years.
Many neighbouring countries began to grow envious of the wealth that sericulture provided China, and beginning in the 2nd century BC, the Xiongnu people regularly pillaged the provinces of the Han Chinese for around 250 years. Silk was a common offering by the emperor to these tribes in exchange for peace.
Early seed plants like ferns have spores and motile sperm that swim in a water medium, called zooidogamy. [18] The angiosperm pollen tube is simple, unbranched, and fast growing, however this is not the case for ancestral plants. In gymnosperms like Ginkgo biloba and cycadophyta, a haustorial pollen tube forms. The tube simply soaks up ...
Poppies are herbaceous plants, often grown for their colourful flowers. One species of poppy, Papaver somniferum , is the source of the narcotic drug mixture opium , which contains powerful medicinal alkaloids such as morphine and has been used since ancient times as an analgesic and narcotic medicinal and recreational drug .
The life cycle of the moth is much like that of any other Saturniidae species. It lays flat, light-brown eggs on the leaves of a number of host trees, preferring Ulmus americana (American elm), Betula (birch), Salix (willow), but also, more rarely, can survive on other trees, including: Quercus (oak), Acer (maple), Carya (hickory), Fagus (beech), Gleditsia triacanthos (honey locust), Juglans ...
Bombax ceiba, like other trees of the genus Bombax, is commonly known as cotton tree.More specifically, it is sometimes known as Malabar silk-cotton tree; red silk-cotton; red cotton tree; or ambiguously as silk-cotton or kapok, [3] both of which may also refer to Ceiba pentandra.
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