Design speeds for frontage roads are a factor in the design of the roadway. For consistency, design speeds should be used that match values used for collector streets or highways. For urban frontage roads, the desirable design speed is 50 mph [80 km/h] and the minimum design speed is 30 mph [50 km/h].
Different plants reproduce in different ways. Some plants reproduce asexually, others do use a type of sexual reproduction. Flowering plants in particular reproduce both sexua â¦ lly and asexually. Reproduction in flowering plants involves the production of gametes, the transfer of the male gametes to the female ovules is through pollen.
Comments. Submit. Flowers and pollen are essential to the reproductive function of plants. Pollen carries the male sex cells of the plant, which are produced on a structure called the stamen or androecium, often known more descriptively as the filament.nther. The top of the filament is the home to the anther, a larger and usually slightly elongated knob that is often coated with yellow, dusty pollen. Inside each anther are four sacs in which pollen is produced.