1.

Fill in the blanks Corian and _________are the membranes formed by the growing embryo.The umbilical cord connects the embryo with the _________.The gestation period in human beings is 9 months or ________days.The reproductive part of the flower that contains _______ or germ cells is stamens and carpels.Pollen grains are spores produced by pollen ________ present in the pollen sac of the anther.Pollen grain germinates on stigma and produces a _____thin-walled pollen tube, one of its two nuclei divides and forms two sperms.Union of one sperm with the egg in _______is called fertilization.Union of second sperm with fusion nucleus is known as double _______.Continuation of life starts from cells either those of the general body or the __________.

Answer»
  1.  Corian and Amnion are the membranes formed by the growing embryo.
  2. The umbilical cord connects the embryo with the placenta.
  3. The gestation period in human beings is 9 months or 280 days.
  4. The reproductive part of the flower that contains sex cells or germ cells is stamens and carpels.
  5. Pollen grains are spores produced by pollen mother cells present in the pollen sac of the anther.
  6. Pollen grain germinates on stigma and produces a slender thin-walled pollen tube, one of its two nuclei divides and forms two sperms.
  7. Union of one sperm with the egg in embryosac is called fertilization.
  8. Union of second sperm with fusion nucleus is known as double fertilisation.
  9. Continuation of life starts from cells either those of the general body or the sex cells.


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