Fruits are mainly used for dispersal, and also to protect the seeds. Beetles were after pollen. Bees came later. Bee flowers have special UV reflecting pigments, fragrance, and nectar to attract faithful pollinators. Hummingbird flowers are pure red, scentless, and have a dilute nectar.
Skunk cabbage generates heat in the flower and stinks to attract flies.
Some fruits must pass thru the gut of an animal for successful germination of seeds. Some plants are very successful and rarely reproduce sexually. Parenchyma is the most common cell type in herbs . Beside being a filler, it is the main photosynthetic cells type in leaves and is involved in food storage. What we call wood is xylem.