The outer region consists almost entirely of the slowly migrating massive positive ions, moving toward the uncurved electrode along with, close to the interface of this region, secondary electrons, liberated by photons leaving the plasma, being re-accelerated into the plasma.
12.
Plants generally produce ovules of four shapes : the most common shape is called "'anatropous "', with a curved shape . "'Orthotropous "'ovules are straight with all the parts of the ovule lined up in a long row producing an uncurved seed . "'Campylotropous "'ovules have a curved megagametophyte often giving the seed a tight " C " shape.
