Fertilisation

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Fertilisation
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Fertilisation in Plants

• Pollen is the male sex cell. It can transferred
  by wind pollination or insect pollination. When a
  pollen grain lands on the stigma it absorbs the
  sugar on the stigma to form a pollen tube which
  grows down towards the ovule. When the nucleus of
  the male sex cell reaches the nucleus of the
  ovule they fuse and form a zygote. Only the
  pollen nucleus passes down the pollen tube. The
  zygote grows into an embryo plant. It inherits
  some characteristics from one parent and some
  from the other parent.

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Young shoot
Young root
Seed Coat
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Germination

• Germination is the development of a plant embryo
  into an independent plant with green leaves.
  During germination the food store present in the
  seed leaves is digested to give the young plant
  food and energy for growth.

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Oviduct
Ovary
Uterus
Cervix
Vagina
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Fertilisation in Humans

• Sperm cells are produced in the testes. Eggs are
  produced in the ovaries. The egg is unable to
  move by itself. The oviduct moves the egg towards
  the uterus using hair-like cilia.
• During sexual intercourse the penis is inserted
  into the vagina and sperm is released. Sperm use
  their tails to swim up the uterus and into the
  oviducts. It is here where fertilisation occurs.
  The nucleus of one sperm cell fuses with the
  nucleus of the egg. The embryo develops in the
  uterus.