Question

Does wind helps to disperse pollen grains​

Answer 1

Answer:

yes bro it takes the wast that is lighter

Answer 2

Answer:

water pollution

Almost all the grasses, sedges, and rushes are wind-pollinated, as are the majority of forest trees in temperate climates, including conifers. Airborne pollen cannot be targeted to stigmas of compatible plants as specifically as insect-borne pollen. The success of wind pollination therefore relies on huge quantities of light, dry pollen being produced and transported into air currents so that at least a small proportion lands on the exposed stigmas of other plants. Millions of grains of pollen fill the air when trees or grasses are in flower, and it is this pollen which is largely responsible for hay fever, an allergic reaction to a variety of pollens. Wind pollination has the advantage that it does not rely on the presence and seasonality of insects.

The rate of fall of pollen grains in calm air varies considerably from about 2 cm s−1 for small buoyant pollen grains (e.g., hazel (Corylus avellana), birch (Betula spp.)) to 50 cm s−1 for heavy windborne pollen (e.g., corn (Zea mays; maize)). The distribution and dynamics of pollen flow away from the source will depend not only on the plant and atmospheric conditions, including turbulence, but also on the vegetation and surrounding landscape. In temperate deciduous trees, the flowers are borne and pollination is effected before the leaves unfurl and obstruct air movement around the trees. Airborne pollen dispersal often shows a leptokurtic distribution (Figure 4). This means that pollen deposition close to the source is greater than expected from a normal distribution. There is often a long thin tail to the distribution: tiny quantities of pollen are distributed very long distances

Since wind pollination is most effective at short distances, it is most often found in plant species growing at high density, for example grasses and temperate forest trees. ... Simulation of a leptokurtic distribution of airborne pollen grains at different distances from a wind-pollinated plant source

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