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- What are the advantages and disadvantages of self and cross pollination? How are the structures of the pistil and stamen adapted for successful fertilization?What is the difference between self-pollination and cross-pollination? If pollen is transferred from the stamens of a flower to the stigma of the very same flower, is that cross-pollination or self-pollination? If it is transferredfrom the stamen of one flower to the stigma of another flower on the very same plant? If it is transferred from the stamen of one flower to the stigma of another flower on a different plant, but a plant that is a clone of the first one? Animals do not have pollen, of course, but why is it that most animals never have to worry about the equivalent problem of self-fertilization? Why cannot most animals fertilize themselves?Both wind and water pollinated flowers are not very colourful and do not produce nectar. What would be the reason for this?
- About 100 years ago, C. E. Bessey developed the hypothesis of the “ranalean” flower. What are some of the characters of this type of flower? Is the ranalean flower wind pollinated or insect pollinated?Most wind-pollinated flowering plants have inconspicuous, non-fragrant flowers. How might nature be affected if all flowers were that way?In Sunflower, If the flower is gamopetalous, are the stamens epipetalous? If so, are the stamens inserted on the tube or on the throat of the corolla? Are the stamens connivant or not? If there are as many stamens as petals, are the stamens opposite or alternate with the petals or lobes of the corolla? Split the corolla from top to bottom to determine this.