Topic #3: Gymnosperm Ovule

• Identify the parts of a Gymnosperm Ovule:

  A) micropyle

  B) integument

  C) nucellus

  D) megasporocyte

  
• Identify the parts of an Angiosperm Ovule:

  A) style

  B) ovary

  C) micropyle

  D) integuments

  E) ovary wall

  F) megasporocyte

  G) funinculus

  H) nucellus

  
• Micropyle

  • where pollen tube enters
• Nucellus

  • lies within the ovule and surrounded by the integument and serves as a nutritive tissue for the developing embryo
• Megasporocyte

  • a diploid precursor cell found within the ovule
• Megasporocyte

  • During a process called megasporogenesis, the megasporocyte undergoes meiosis, resulting in the production of four haploid cells known as megaspores
• Integument

  • there is only 1 ovule integument in Gymnosperms while 2 in Angiosperms
• Gymnosperms have no ovary wall, hence they are called naked seeds
• Apophysis

  • upper, flattened portion of the microsporophyll which supplies nutrients to the microsporangia
• Pine seeds are winged for faster wind dispersion
• Identify what part of the Pinus Ovule is being pointed at:

  A - Gametophyte

  B - Egg Cell

  C - Micropyle

  D - Integument

  E - Megasporangium