seed coat The tough outer layer of the seed, derived from the outer layers of the ovule. PICTURE
segments Repeating units in the body parts of some animals.
Hard seed coats or physical dormancy occurs when seeds are impermeable to water or the exchange of gases. In some seeds the seed coat physically prevents the seedling from growing.
Chemical dormancy includes growth regulators etc.
seed coat The outer layer of a seed that is developed from the integuments of the ovule; the testa.
seed ferns Fossil plants with fernlike foliage but producing seeds belonging to the division Pteridospermophyta.
The primary root emerges through the seed coats while the seed is still buried in the soil.
The hypocotyl emerges from the seed coats and pushes its way up through the soil.
nutritive substances within the seed coats, but not part of the embryo proper
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
...
(skler-ee-id)
A short, irregular sclerenchyma cell in nutshells and seed coats and scattered through the parenchyma of some plants.
sclerenchyma cell ...
 See also: Embryo, Seed, Plant, Sperm, Tissue
  
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