release of pollen

• what surrounds a pollen grain

  a tough outer wall called the exine
• what is the exine of a pollen grain

  the outer tough external wall
• what is another name for the release of pollen

  dehiscence
• what is the exine resistant too

  desiccation
• what is desiccation


  drying out
• what does the exine being resistant to desiccation mean


  it can be transferred from one flower to another without drying out
• what is pollen ressitant to

  uv radiation and drying out
• what is pollen being ressitant to UV radiation mean

  it can be carried at high altitudes
• what is meant by dehiscence

  to burst open
• what is the first stage of dehiscence (release of pollen)

  the outer layer of the anther will dry out causing tension
• what happens to the anther when dehiscence occurs

  the tention causes the walls of the anther to pull apart
• what happens in dehiscence when the anther Walls are pulled apart


  the edges of the pollen sacs curl away
• what is the opening that releases pollen

  strontium
• what is the stromium


  this is an opening that exposes pollen grains
• what two ways will pollen grains be taken away from the stromium

  either wind or insects
• why might not all pollen grains be compatible when they land on a stigma

  it might be a different species of plant