embryo sac definitions

• what is meant by a micropyle

  this is a gap in the integuments for the male nuclei to enter the embryo sac
• what is the function of the integuments

  to protect the embryo sac
• what are integuments


  two coverings that cover the ovule
• what is the function of the funicle

  to attach the ovule to the ovary wall
• what the function of the polar nuclei

  to fuse with a male nucleus in double fertilisation to form a triploid endosperm
• what is the function of the female gamete

  to fuse with a male nucleus to form a zygote