Sometimes sound and uninjured seeds may fail to germinate due to reduced activity of the seed or seed parts resulting in blockade of the growth. This may be due to:
AExternal effects of environmentOption A
BInternal conditions within the plant itself, i.e. Embryo dormancy or seed coat dormancyOption B
The best seed moisture content is below 10% of the oven dry weight for the coniferous but it must be kept above _____ for most of the broad leaved species: