def serialize_seeds(seeds, block):
for seed_dict in block.seeds:<EOL><INDENT>seed = etree.SubElement(seeds, '<STR_LIT>')<EOL>seed.set('<STR_LIT>', unicode(seed_dict.get('<STR_LIT>', <NUM_LIT:0>) + <NUM_LIT:1>))<EOL>seed.text = seed_dict.get('<STR_LIT>', '<STR_LIT>')<EOL><DEDENT>
Serialize the seeds in peer instruction XBlock to xml

Args:
    seeds (lxml.etree.Element): The <seeds> XML element.
    block (PeerInstructionXBlock): The XBlock with configuration to serialize.

Returns:
    None