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.
Some plants don't have flowers. Plants such as mosses and ferns reproduce by spores. Cone-bearing plants, like pine or spruce trees for example, reproduce by means of pollen that is produced by a male cone and travels by wind to a female cone of the same species.The seeds then develop in the female cone.Find out more about pollinators! Sing a Pollination Song!hen pollen from a plant's stamen is transferred to that same plant's stigma, it is called self-pollination. When pollen from a plant's stamen is transferred to a different plant's stigma, it is called cross-pollination. Cross-pollination produces stronger plants. The plants must be of the same species.