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.
Plants with flowers need pollination to create new seeds that will grow into new plants. The flower of a plant is usually where reproduction occurs, so without pollination a flower cannot reproduce. Of the 300,000 plant species on this planet that produce pollen, each type makes pollen unique only to that plant, according to National Geographic.