3.4 Plant Fertilization notes

• Pollen grain on stigma
• Pollen tube grows down to ovule
• Nucleus travels down tube to ovule and fertilize
• Outside of Ovule forms the seed coat
• Catelydons inside ovule (power pack/food storage)
• Thickening of the walls of ovary to make fruit

3.3b Wind Pollination

• Anther  stigma (by wind)
• Pollen grain adaptation-light weight, wing feature to move through air
• Exposed anther (exposed to the wind)
• Stigma with large surface area to catch pollen (feather like structure)
• In addition- no scent, no petals, no color,

3.3a Insect Pollination

• Pollination by insect
• Pollen (male nuclei) transferred to stigma of another flower
• Attraction of insect to the flower is needed
• Signals to the insect (scents, color petals)
• Value to insects (food nectarines/ pollen protein)