4Petal-Petals are used to attract insects into the flower, they may have guidelines on them and be scented.Stigma-Is covered in a sticky substance that the pollen grains will adhere to.Style-The style raises the stigma away from the Ovary to decrease the likelihood of pollen contamination. It varies in length.
5Ovary-This protects the ovule and once fertilization has taken place it will become the fruit.Ovule-The Ovule is like the egg in animals and once fertilization has taken place will become the seed.
6Gives support to the flower and elevates the flower for the insects. Flower stalk-Gives support to the flower and elevates the flower for the insects.Nectary-This is where a sugary solution called nectar is held to attract insects.Sepal-Sepals protect the flower whilst the flower is developing from a bud.
7This is the stalk of the Anther. Filament-This is the stalk of the Anther.Anther-The Anthers contain pollen sacs.The sacs release pollen on to the outside of the anthers that brush against insects on entering the flowers.Once the pollen is deposited on the insect..it is transferred to the stigma of another flower.The ovule is then able to be fertilized.
9Male Parts Female Parts StamenAntherFilamentPistil OvaryStigma OvuleStyle
102 Types of flowers: Perfect vs. Imperfect a flower that has either all male parts or all female partsImperfect-EX: cucumbers, pumpkin, and melonsa flower that has both male and female parts in the same flowerPerfect-EX: roses, lilies, and dandelions
14From ovary to fruit The ovary of the flower contains the ovules. As fertilized ovules develop into seeds, the ovary wall develops into the fruit.In science, the term “fruit” refers to a mature ovary that contains seeds.
18Fruit dispersal The form of the fruit gives clues about its dispersal. Small, dry fruits with “wings” or “parachutes” may be wind-dispersed. Fleshy fruits are often animal dispersed. Explosive fruits can fling seeds away. Floating fruits may be water dispersed.
19How are these fruits dispersed? DandelionCoconutMapleCockleburJewelweed
20Thinking question:Why must fruits be dispersed away from the parent plant?
25Seed dormancySeeds can remain dormant in the soil for long periods of time. Dormancy helps ensure that seeds only germinate when conditions are right.When we weed or cultivate a bare patch of soil, the weeds that sprout up immediately usually come from the “seed bank” already in the soil.
26Breaking dormancySeeds require moisture and the right temperature to germinate.In addition, some seeds germinate only after certain environmental signals:DryingTemperature (period of cold or heat)Disruption of the seed coat
27Thinking questionWhat could be the advantage of waiting for each of these signals to germinate?Long period of coldHigh heat of a forest fireDrying outDisruption of the seed coat.