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A man's coat meant to be worn while hunting, for example, would have shoulders tailored with extra room to provide unrestricted movement, while also allowing the wearer to pull their arms into the garment and close to the body for warmth. [192] The long back flap kept the hunter's back covered when crouched over and waiting for an animal. [198]
Scarification is often done mechanically, thermally, and chemically. The seeds of many plant species are often impervious to water and gases, thus preventing or delaying germination. Any process designed to make the testa (seed coat) more permeable to water and gases is known as scarification.
Dry fruits depend more on physical forces, like wind and water. Dry fruits' seeds can also perform pod shattering, which involve the seed being ejected from the seed coat by shattering it. Some dry fruits are able to perform seed pod explosions, such as wisteria, resulting the seed to be dispersed over long distances. Like fleshy fruits, dry ...
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The seed coat develops from the maternal tissue, the integuments, originally surrounding the ovule. The seed coat in the mature seed can be a paper-thin layer (e.g. peanut) or something more substantial (e.g. thick and hard in honey locust and coconut), or fleshy as in the sarcotesta of pomegranate. The seed coat helps protect the embryo from ...
As the plant embryo grows at germination, it sends out a shoot called a radicle that becomes the primary root, and then penetrates down into the soil.After emergence of the radicle, the hypocotyl emerges and lifts the growing tip (usually including the seed coat) above the ground, bearing the embryonic leaves (called cotyledons), and the plumule that gives rise to the first true leaves.
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Leguminous seeds are examples of such sclerification. Larger sclereids form columns in the epidermis of pea, bean, and soybean seeds, and bone-shaped osteosclereids occur beneath the epidermis. In the seed coats of coconuts, sclereids possess numerous bordered pits. [2] These larger macrosclereids found in seed coats are of protodermal origin. [4]
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